Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model
The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to inv...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Feng, Chao [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2016transfer abstract |
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| Schlagwörter: |
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| Umfang: |
15 |
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| Übergeordnetes Werk: |
Enthalten in: DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS - Munnur, Ravi Kiran ELSEVIER, 2016, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:237 ; year:2016 ; pages:371-385 ; extent:15 |
| Links: |
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| DOI / URN: |
10.1016/j.jmatprotec.2016.06.030 |
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| Katalog-ID: |
ELV024595276 |
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| 245 | 1 | 0 | |a Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model |
| 264 | 1 | |c 2016transfer abstract | |
| 300 | |a 15 | ||
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| 520 | |a The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. | ||
| 520 | |a The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. | ||
| 650 | 7 | |a Large ingot |2 Elsevier | |
| 650 | 7 | |a Cogging process |2 Elsevier | |
| 650 | 7 | |a Closure efficiency |2 Elsevier | |
| 650 | 7 | |a Void |2 Elsevier | |
| 700 | 1 | |a Cui, Zhenshan |4 oth | |
| 700 | 1 | |a Liu, Mingxiang |4 oth | |
| 700 | 1 | |a Shang, Xiaoqing |4 oth | |
| 700 | 1 | |a Sui, Dashan |4 oth | |
| 700 | 1 | |a Liu, Juan |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Munnur, Ravi Kiran ELSEVIER |t DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS |d 2016 |g Amsterdam [u.a.] |w (DE-627)ELV014190494 |
| 773 | 1 | 8 | |g volume:237 |g year:2016 |g pages:371-385 |g extent:15 |
| 856 | 4 | 0 | |u https://doi.org/10.1016/j.jmatprotec.2016.06.030 |3 Volltext |
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10.1016/j.jmatprotec.2016.06.030 doi GBV00000000000498.pica (DE-627)ELV024595276 (ELSEVIER)S0924-0136(16)30209-6 DE-627 ger DE-627 rakwb eng 610 VZ 600 690 VZ 51.00 bkl 51.32 bkl Feng, Chao verfasserin aut Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model 2016transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. Large ingot Elsevier Cogging process Elsevier Closure efficiency Elsevier Void Elsevier Cui, Zhenshan oth Liu, Mingxiang oth Shang, Xiaoqing oth Sui, Dashan oth Liu, Juan oth Enthalten in Elsevier Munnur, Ravi Kiran ELSEVIER DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS 2016 Amsterdam [u.a.] (DE-627)ELV014190494 volume:237 year:2016 pages:371-385 extent:15 https://doi.org/10.1016/j.jmatprotec.2016.06.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_21 GBV_ILN_40 GBV_ILN_2009 GBV_ILN_2010 51.00 Werkstoffkunde: Allgemeines VZ 51.32 Werkstoffmechanik VZ AR 237 2016 371-385 15 |
| spelling |
10.1016/j.jmatprotec.2016.06.030 doi GBV00000000000498.pica (DE-627)ELV024595276 (ELSEVIER)S0924-0136(16)30209-6 DE-627 ger DE-627 rakwb eng 610 VZ 600 690 VZ 51.00 bkl 51.32 bkl Feng, Chao verfasserin aut Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model 2016transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. Large ingot Elsevier Cogging process Elsevier Closure efficiency Elsevier Void Elsevier Cui, Zhenshan oth Liu, Mingxiang oth Shang, Xiaoqing oth Sui, Dashan oth Liu, Juan oth Enthalten in Elsevier Munnur, Ravi Kiran ELSEVIER DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS 2016 Amsterdam [u.a.] (DE-627)ELV014190494 volume:237 year:2016 pages:371-385 extent:15 https://doi.org/10.1016/j.jmatprotec.2016.06.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_21 GBV_ILN_40 GBV_ILN_2009 GBV_ILN_2010 51.00 Werkstoffkunde: Allgemeines VZ 51.32 Werkstoffmechanik VZ AR 237 2016 371-385 15 |
| allfields_unstemmed |
10.1016/j.jmatprotec.2016.06.030 doi GBV00000000000498.pica (DE-627)ELV024595276 (ELSEVIER)S0924-0136(16)30209-6 DE-627 ger DE-627 rakwb eng 610 VZ 600 690 VZ 51.00 bkl 51.32 bkl Feng, Chao verfasserin aut Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model 2016transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. Large ingot Elsevier Cogging process Elsevier Closure efficiency Elsevier Void Elsevier Cui, Zhenshan oth Liu, Mingxiang oth Shang, Xiaoqing oth Sui, Dashan oth Liu, Juan oth Enthalten in Elsevier Munnur, Ravi Kiran ELSEVIER DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS 2016 Amsterdam [u.a.] (DE-627)ELV014190494 volume:237 year:2016 pages:371-385 extent:15 https://doi.org/10.1016/j.jmatprotec.2016.06.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_21 GBV_ILN_40 GBV_ILN_2009 GBV_ILN_2010 51.00 Werkstoffkunde: Allgemeines VZ 51.32 Werkstoffmechanik VZ AR 237 2016 371-385 15 |
| allfieldsGer |
10.1016/j.jmatprotec.2016.06.030 doi GBV00000000000498.pica (DE-627)ELV024595276 (ELSEVIER)S0924-0136(16)30209-6 DE-627 ger DE-627 rakwb eng 610 VZ 600 690 VZ 51.00 bkl 51.32 bkl Feng, Chao verfasserin aut Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model 2016transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. Large ingot Elsevier Cogging process Elsevier Closure efficiency Elsevier Void Elsevier Cui, Zhenshan oth Liu, Mingxiang oth Shang, Xiaoqing oth Sui, Dashan oth Liu, Juan oth Enthalten in Elsevier Munnur, Ravi Kiran ELSEVIER DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS 2016 Amsterdam [u.a.] (DE-627)ELV014190494 volume:237 year:2016 pages:371-385 extent:15 https://doi.org/10.1016/j.jmatprotec.2016.06.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_21 GBV_ILN_40 GBV_ILN_2009 GBV_ILN_2010 51.00 Werkstoffkunde: Allgemeines VZ 51.32 Werkstoffmechanik VZ AR 237 2016 371-385 15 |
| allfieldsSound |
10.1016/j.jmatprotec.2016.06.030 doi GBV00000000000498.pica (DE-627)ELV024595276 (ELSEVIER)S0924-0136(16)30209-6 DE-627 ger DE-627 rakwb eng 610 VZ 600 690 VZ 51.00 bkl 51.32 bkl Feng, Chao verfasserin aut Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model 2016transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. Large ingot Elsevier Cogging process Elsevier Closure efficiency Elsevier Void Elsevier Cui, Zhenshan oth Liu, Mingxiang oth Shang, Xiaoqing oth Sui, Dashan oth Liu, Juan oth Enthalten in Elsevier Munnur, Ravi Kiran ELSEVIER DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS 2016 Amsterdam [u.a.] (DE-627)ELV014190494 volume:237 year:2016 pages:371-385 extent:15 https://doi.org/10.1016/j.jmatprotec.2016.06.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_21 GBV_ILN_40 GBV_ILN_2009 GBV_ILN_2010 51.00 Werkstoffkunde: Allgemeines VZ 51.32 Werkstoffmechanik VZ AR 237 2016 371-385 15 |
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English |
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Enthalten in DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS Amsterdam [u.a.] volume:237 year:2016 pages:371-385 extent:15 |
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Enthalten in DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS Amsterdam [u.a.] volume:237 year:2016 pages:371-385 extent:15 |
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Werkstoffkunde: Allgemeines Werkstoffmechanik |
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DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS |
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DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS |
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investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-d void evolution model |
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Investigation on the void closure efficiency in cogging processes of the large ingot by using a 3-D void evolution model |
| abstract |
The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. |
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The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. |
| abstract_unstemmed |
The internal void defects often exist in the large ingot inevitably due to the non-uniform solidification of the materials. To guarantee the mechanical performance of the products, these voids should be closed and eliminated in the subsequent forging process. The main purpose of this study is to investigate the void closure efficiency in different cogging processes of large ingot by using a 3-D void evolution model. In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning. |
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In order to obtain a more reasonable description of the actual engineering condition, the voids were considered as prolate ellipsoidal, and the influences of the instantaneous void shape changing, stress state and deformation history were taken into account for the void evolution. According to the results, alternate compression in different directions makes the changing of the void shape counteracted and decreases the void closure efficiency. The initial void shape impacts the void closure significantly, as the non-spherical void shape causes the anisotropy of the void closing behavior. It can be found that the compression perpendicular to the longer principal axis of the prolate void provides the higher void closure efficiency than the compression aligned with this direction. Therefore, using the extend-forging as the first step in cogging process is more efficient to close the voids, considering the morphology of the real voids in the ingot. Moreover, appropriate processing parameters were determined to enhance the void closure efficiency in extend-forging. Besides, the surface bonding experiments show that the high pressure and temperature, as well as the long holding time, are favorable to eliminate the void defects after the void closure. It implies that the processing sequence, which can make the void closed completely at high pressure and high temperature and keep the sufficient interval time between forming stages, should be emphasized in the process planning.</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Large ingot</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Cogging process</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Closure efficiency</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Void</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Cui, Zhenshan</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Liu, Mingxiang</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Shang, Xiaoqing</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Sui, Dashan</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Liu, Juan</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Enthalten in</subfield><subfield code="n">Elsevier</subfield><subfield code="a">Munnur, Ravi Kiran ELSEVIER</subfield><subfield code="t">DIAGNOSTIC ACCURACY OF ASLA SCORE (A NOVEL CT ANGIOGRAPHIC INDEX) AND AGGREGATE PLAQUE VOLUME IN THE ASSESSMENT OF FUNCTIONAL SIGNIFICANCE OF CORONARY STENOSIS</subfield><subfield code="d">2016</subfield><subfield code="g">Amsterdam [u.a.]</subfield><subfield code="w">(DE-627)ELV014190494</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:237</subfield><subfield code="g">year:2016</subfield><subfield code="g">pages:371-385</subfield><subfield code="g">extent:15</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://doi.org/10.1016/j.jmatprotec.2016.06.030</subfield><subfield code="3">Volltext</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ELV</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SYSFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_21</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_40</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2009</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2010</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">51.00</subfield><subfield code="j">Werkstoffkunde: Allgemeines</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">51.32</subfield><subfield code="j">Werkstoffmechanik</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">237</subfield><subfield code="j">2016</subfield><subfield code="h">371-385</subfield><subfield code="g">15</subfield></datafield></record></collection>
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