Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures
High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various compos...
Ausführliche Beschreibung
Autor*in: |
Velikanova, T. A. [verfasserIn] |
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Artikel |
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Sprache: |
Englisch |
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2013 |
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Schlagwörter: |
high-temperature X-ray diffraction |
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© Springer Science+Business Media New York 2013 |
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Übergeordnetes Werk: |
Enthalten in: Powder metallurgy and metal ceramics - Springer US, 1993, 52(2013), 3-4 vom: Juli, Seite 212-222 |
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volume:52 ; year:2013 ; number:3-4 ; month:07 ; pages:212-222 |
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DOI / URN: |
10.1007/s11106-013-9515-9 |
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OLC2061155324 |
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520 | |a High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. | ||
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650 | 4 | |a coefficient of thermal expansion | |
650 | 4 | |a Fe–Mo–Cr–C phase diagram | |
700 | 1 | |a Karpets, M. V. |4 aut | |
700 | 1 | |a Kuprin, V. V. |4 aut | |
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10.1007/s11106-013-9515-9 doi (DE-627)OLC2061155324 (DE-He213)s11106-013-9515-9-p DE-627 ger DE-627 rakwb eng 670 VZ Velikanova, T. A. verfasserin aut Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures 2013 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media New York 2013 High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. Mn-like phases spinning method high-temperature X-ray diffraction diffusionless transformations coefficient of thermal expansion Fe–Mo–Cr–C phase diagram Karpets, M. V. aut Kuprin, V. V. aut Enthalten in Powder metallurgy and metal ceramics Springer US, 1993 52(2013), 3-4 vom: Juli, Seite 212-222 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:52 year:2013 number:3-4 month:07 pages:212-222 https://doi.org/10.1007/s11106-013-9515-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 AR 52 2013 3-4 07 212-222 |
spelling |
10.1007/s11106-013-9515-9 doi (DE-627)OLC2061155324 (DE-He213)s11106-013-9515-9-p DE-627 ger DE-627 rakwb eng 670 VZ Velikanova, T. A. verfasserin aut Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures 2013 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media New York 2013 High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. Mn-like phases spinning method high-temperature X-ray diffraction diffusionless transformations coefficient of thermal expansion Fe–Mo–Cr–C phase diagram Karpets, M. V. aut Kuprin, V. V. aut Enthalten in Powder metallurgy and metal ceramics Springer US, 1993 52(2013), 3-4 vom: Juli, Seite 212-222 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:52 year:2013 number:3-4 month:07 pages:212-222 https://doi.org/10.1007/s11106-013-9515-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 AR 52 2013 3-4 07 212-222 |
allfields_unstemmed |
10.1007/s11106-013-9515-9 doi (DE-627)OLC2061155324 (DE-He213)s11106-013-9515-9-p DE-627 ger DE-627 rakwb eng 670 VZ Velikanova, T. A. verfasserin aut Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures 2013 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media New York 2013 High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. Mn-like phases spinning method high-temperature X-ray diffraction diffusionless transformations coefficient of thermal expansion Fe–Mo–Cr–C phase diagram Karpets, M. V. aut Kuprin, V. V. aut Enthalten in Powder metallurgy and metal ceramics Springer US, 1993 52(2013), 3-4 vom: Juli, Seite 212-222 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:52 year:2013 number:3-4 month:07 pages:212-222 https://doi.org/10.1007/s11106-013-9515-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 AR 52 2013 3-4 07 212-222 |
allfieldsGer |
10.1007/s11106-013-9515-9 doi (DE-627)OLC2061155324 (DE-He213)s11106-013-9515-9-p DE-627 ger DE-627 rakwb eng 670 VZ Velikanova, T. A. verfasserin aut Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures 2013 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media New York 2013 High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. Mn-like phases spinning method high-temperature X-ray diffraction diffusionless transformations coefficient of thermal expansion Fe–Mo–Cr–C phase diagram Karpets, M. V. aut Kuprin, V. V. aut Enthalten in Powder metallurgy and metal ceramics Springer US, 1993 52(2013), 3-4 vom: Juli, Seite 212-222 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:52 year:2013 number:3-4 month:07 pages:212-222 https://doi.org/10.1007/s11106-013-9515-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 AR 52 2013 3-4 07 212-222 |
allfieldsSound |
10.1007/s11106-013-9515-9 doi (DE-627)OLC2061155324 (DE-He213)s11106-013-9515-9-p DE-627 ger DE-627 rakwb eng 670 VZ Velikanova, T. A. verfasserin aut Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures 2013 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media New York 2013 High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. Mn-like phases spinning method high-temperature X-ray diffraction diffusionless transformations coefficient of thermal expansion Fe–Mo–Cr–C phase diagram Karpets, M. V. aut Kuprin, V. V. aut Enthalten in Powder metallurgy and metal ceramics Springer US, 1993 52(2013), 3-4 vom: Juli, Seite 212-222 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:52 year:2013 number:3-4 month:07 pages:212-222 https://doi.org/10.1007/s11106-013-9515-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 AR 52 2013 3-4 07 212-222 |
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A.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2013</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">ohne Hilfsmittel zu benutzen</subfield><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Band</subfield><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Springer Science+Business Media New York 2013</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. 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Velikanova, T. A. |
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Velikanova, T. A. ddc 670 misc Mn-like phases misc spinning method misc high-temperature X-ray diffraction misc diffusionless transformations misc coefficient of thermal expansion misc Fe–Mo–Cr–C phase diagram Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures |
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670 VZ Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures Mn-like phases spinning method high-temperature X-ray diffraction diffusionless transformations coefficient of thermal expansion Fe–Mo–Cr–C phase diagram |
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ddc 670 misc Mn-like phases misc spinning method misc high-temperature X-ray diffraction misc diffusionless transformations misc coefficient of thermal expansion misc Fe–Mo–Cr–C phase diagram |
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Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures |
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Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures |
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Velikanova, T. A. |
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stability of the α-mn structure in rapidly solidified fe–mo–cr–c alloys at high temperatures |
title_auth |
Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures |
abstract |
High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. © Springer Science+Business Media New York 2013 |
abstractGer |
High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. © Springer Science+Business Media New York 2013 |
abstract_unstemmed |
High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified $ Fe_{64.9} $$ Mo_{19.6} $$ Cr_{14.5} $C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition ($ α_{1} $, $ α_{2} $, α), η-carbon intermetallic ($ M_{6} $C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙$ 10^{–6} $ $ K^{–1} $. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙$ 10^{–6} $ $ K^{–1} $. The coefficients of thermal expansion of the η- and α-phases are 15.257∙$ 10^{–6} $ and 7.117∙$ 10^{–6} $ $ K^{–1} $. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy. © Springer Science+Business Media New York 2013 |
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Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr–C alloys at high temperatures |
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