Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment
Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Naz, Nausheen [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2009 |
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| Schlagwörter: |
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| Anmerkung: |
© ASM International 2009 |
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| Übergeordnetes Werk: |
Enthalten in: Practical failure analysis - Springer New York, 2001, 9(2009), 4 vom: 12. Mai, Seite 370-379 |
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| Übergeordnetes Werk: |
volume:9 ; year:2009 ; number:4 ; day:12 ; month:05 ; pages:370-379 |
| Links: |
|---|
| DOI / URN: |
10.1007/s11668-009-9256-8 |
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SPR021663939 |
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| 520 | |a Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. | ||
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| 650 | 4 | |a Untempered martensite |7 (dpeaa)DE-He213 | |
| 700 | 1 | |a Tariq, Fawad |4 aut | |
| 700 | 1 | |a Baloch, Rasheed Ahmed |4 aut | |
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10.1007/s11668-009-9256-8 doi (DE-627)SPR021663939 (SPR)s11668-009-9256-8-e DE-627 ger DE-627 rakwb eng Naz, Nausheen verfasserin aut Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © ASM International 2009 Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. Nozzle (dpeaa)DE-He213 Heat affected zone (dpeaa)DE-He213 Weld cracking (dpeaa)DE-He213 Residual stresses (dpeaa)DE-He213 GTAW (dpeaa)DE-He213 Untempered martensite (dpeaa)DE-He213 Tariq, Fawad aut Baloch, Rasheed Ahmed aut Enthalten in Practical failure analysis Springer New York, 2001 9(2009), 4 vom: 12. Mai, Seite 370-379 (DE-627)886125871 (DE-600)2893589-5 5555-1313 nnns volume:9 year:2009 number:4 day:12 month:05 pages:370-379 https://dx.doi.org/10.1007/s11668-009-9256-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 9 2009 4 12 05 370-379 |
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10.1007/s11668-009-9256-8 doi (DE-627)SPR021663939 (SPR)s11668-009-9256-8-e DE-627 ger DE-627 rakwb eng Naz, Nausheen verfasserin aut Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © ASM International 2009 Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. Nozzle (dpeaa)DE-He213 Heat affected zone (dpeaa)DE-He213 Weld cracking (dpeaa)DE-He213 Residual stresses (dpeaa)DE-He213 GTAW (dpeaa)DE-He213 Untempered martensite (dpeaa)DE-He213 Tariq, Fawad aut Baloch, Rasheed Ahmed aut Enthalten in Practical failure analysis Springer New York, 2001 9(2009), 4 vom: 12. Mai, Seite 370-379 (DE-627)886125871 (DE-600)2893589-5 5555-1313 nnns volume:9 year:2009 number:4 day:12 month:05 pages:370-379 https://dx.doi.org/10.1007/s11668-009-9256-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 9 2009 4 12 05 370-379 |
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10.1007/s11668-009-9256-8 doi (DE-627)SPR021663939 (SPR)s11668-009-9256-8-e DE-627 ger DE-627 rakwb eng Naz, Nausheen verfasserin aut Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © ASM International 2009 Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. Nozzle (dpeaa)DE-He213 Heat affected zone (dpeaa)DE-He213 Weld cracking (dpeaa)DE-He213 Residual stresses (dpeaa)DE-He213 GTAW (dpeaa)DE-He213 Untempered martensite (dpeaa)DE-He213 Tariq, Fawad aut Baloch, Rasheed Ahmed aut Enthalten in Practical failure analysis Springer New York, 2001 9(2009), 4 vom: 12. Mai, Seite 370-379 (DE-627)886125871 (DE-600)2893589-5 5555-1313 nnns volume:9 year:2009 number:4 day:12 month:05 pages:370-379 https://dx.doi.org/10.1007/s11668-009-9256-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 9 2009 4 12 05 370-379 |
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10.1007/s11668-009-9256-8 doi (DE-627)SPR021663939 (SPR)s11668-009-9256-8-e DE-627 ger DE-627 rakwb eng Naz, Nausheen verfasserin aut Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © ASM International 2009 Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. Nozzle (dpeaa)DE-He213 Heat affected zone (dpeaa)DE-He213 Weld cracking (dpeaa)DE-He213 Residual stresses (dpeaa)DE-He213 GTAW (dpeaa)DE-He213 Untempered martensite (dpeaa)DE-He213 Tariq, Fawad aut Baloch, Rasheed Ahmed aut Enthalten in Practical failure analysis Springer New York, 2001 9(2009), 4 vom: 12. Mai, Seite 370-379 (DE-627)886125871 (DE-600)2893589-5 5555-1313 nnns volume:9 year:2009 number:4 day:12 month:05 pages:370-379 https://dx.doi.org/10.1007/s11668-009-9256-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 9 2009 4 12 05 370-379 |
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10.1007/s11668-009-9256-8 doi (DE-627)SPR021663939 (SPR)s11668-009-9256-8-e DE-627 ger DE-627 rakwb eng Naz, Nausheen verfasserin aut Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © ASM International 2009 Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. Nozzle (dpeaa)DE-He213 Heat affected zone (dpeaa)DE-He213 Weld cracking (dpeaa)DE-He213 Residual stresses (dpeaa)DE-He213 GTAW (dpeaa)DE-He213 Untempered martensite (dpeaa)DE-He213 Tariq, Fawad aut Baloch, Rasheed Ahmed aut Enthalten in Practical failure analysis Springer New York, 2001 9(2009), 4 vom: 12. Mai, Seite 370-379 (DE-627)886125871 (DE-600)2893589-5 5555-1313 nnns volume:9 year:2009 number:4 day:12 month:05 pages:370-379 https://dx.doi.org/10.1007/s11668-009-9256-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 9 2009 4 12 05 370-379 |
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failure analysis of haz cracking in low c–crmov steel weldment |
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Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment |
| abstract |
Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. © ASM International 2009 |
| abstractGer |
Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. © ASM International 2009 |
| abstract_unstemmed |
Abstract This case study describes the failure analysis of steel nozzle in which cracking was observed after a circumferential welding process. The nozzle assembly was made from low C–CrMoV alloy steel that was subsequently single pass butt welded using gas tungsten arc welding. No cracks were found in visual inspection of the welds; however, X-ray radiography showed small discontinuous cracks on the surface in the area adjacent to weld bead, i.e. heat affected zone. The welding of nozzle parts made of same material was a routine process and this type of cracking did not occur in the past. Therefore, it became essential to determine the root cause of the failure. A detailed investigation including visual examination, non-destructive testing, optical microscopy, microhardness measurements and residual stress measurements were carried out to find out the primary cause of failure and to identify actions required to avoid its reoccurrence in future. Results of the investigation revealed that the principal cause of failure was the presence of coarse untempered martensite in the heat affected zone due to localized heating. The localized heating was caused by high welding heat input or low welding speed and resulted in the high transformation stresses. These transformation stresses combined with the thermal stresses and the constraint conditions to cause intergranular brittle fracture. © ASM International 2009 |
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Failure Analysis of HAZ Cracking in Low C–CrMoV Steel Weldment |
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Tariq, Fawad Baloch, Rasheed Ahmed |
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