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J. I. Chaves - One of the best experts on this subject based on the ideXlab platform.
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influence of Austenite Grain Size on recrystallisation precipitation interaction in a v microalloyed steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:Abstract By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation–precipitation–time–temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.
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Influence of Austenite Grain Size on recrystallisation–precipitation interaction in a V-microalloyed steel
Materials Science and Engineering: A, 2007Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation-precipitation-time-temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.Peer reviewe
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Influence of Austenite Grain Size on recrystallisation–precipitation interaction in a V-microalloyed steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:Abstract By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation–precipitation–time–temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.
R.d.k. Misra - One of the best experts on this subject based on the ideXlab platform.
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Effect of Heterogeneous Microstructure on Refining Austenite Grain Size in Low Alloy Heavy-Gage Plate
Metals, 2020Co-Authors: Shengfu Yuan, Chengjia Shang, Zhenjia Xie, J.l. Wang, Longhao Zhu, Ling Yan, R.d.k. MisraAbstract:The present work introduces the role of heterogeneous microstructure in enhancing the nucleation density of reversed Austenite. It was found that the novel pre-annealing produced a heterogeneous microstructure consisting of alloying elements-enriched martensite and alloying-depleted intercritical ferrite. The shape of the martensite at the prior Austenite Grain boundary was equiaxed and acicular at inter-laths. The equiaxed reversed Austenite had a K-S orientation with adjacent prior Austenite Grain, and effectively refined the prior Austenite Grain that it grew into. The alloying elements-enriched martensite provided additional nucleation sites to form equiaxed reversed Austenite at both prior Austenite Grain boundaries and intragranular inter-lath boundaries during re-austenitization. It was revealed that prior Austenite Grain Size was refined to ~12 μm by pre-annealing and quenching, while it was ~30 μm by conventional quenching. This is a practical way of refining transformation products by refining prior Austenite Grain Size to improve the strength, ductility and low temperature toughness of heavy-gage plate steel.
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Improvement of strength-toughness combination in austempered low carbon bainitic steel: The key role of refining prior Austenite Grain Size
Journal of Alloys and Compounds, 2017Co-Authors: H.f. Lan, C.l. Qiu, R.d.k. MisraAbstract:Abstract A low carbon bainitic steel with ultrahigh strength of ∼1650 MPa and elongation and toughness of ∼16% and ∼72 J/cm2 respectively, was obtained through austempering. The resulting microstructure and mechanical properties for varying prior Austenite Grain Size (PAGS) are described. The refinement of the PAGS resulted in finer packet/block Size, higher volume fraction and higher stability of retained Austenite. The coalescence of bainitic laths was effectively hindered when the prior Austenite Grain Size (PAGS) was refined to ∼10 μm. On the other hand, the coalescence of bainitic laths with crystallographically homogeneous characteristic was accompanied by disappearance of film-like retained Austenite and crack can propagate without inhibition, which is detrimental to toughness. Eliminating the coalescence of bainite and increasing the volume fraction of retained Austenite and its stability by means of refining PAGS contributed to ultrahigh strength – high ductility and toughness combination.
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influence of prior Austenite Grain Size on martensite Austenite constituent and toughness in the heat affected zone of 700mpa high strength linepipe steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: S V Subramanian, Chengjia Shang, R.d.k. MisraAbstract:Abstract Structure–mechanical property relationship studies were carried out on Gleeble simulated intercritically reheated coarse-Grained heat affected zone (ICCGHAZ) of 700 MPa linepipe steel microalloyed with Nb. The design of experiments was aimed at varying reheat temperature in the first pass to obtain different coarse Grain Size in the HAZ. This enabled the study of the effect of prior Austenite Grain Size on martensite–Austenite (M–A) constituent during the second pass reheating and its consequent influence on impact toughness. We elucidate here the role of phase transformation and the fraction, Size, shape, distribution, and carbon content of M–A constituent on impact toughness. The data suggests that the fraction of M–A constituent is not influenced by Grain Size, but the Size of M–A constituent is influenced by the prior Austenite Grain Size, which consequently governs toughness. Coarse Austenite Grain Size increases the Size of M–A constituent and lowers the HAZ toughness. Coarse Austenite Grain associated with coarse M–A constituent along Grain boundary is the dominant factor in promoting brittle fracture. The combination of fine prior Austenite Grain Size and smaller M–A constituent is favorable in obtaining high toughness. Good toughness is obtained on refining the prior Austenite Grain Size in the CGHAZ during first pass and hence ICCGHAZ in the second pass.
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Influence of prior Austenite Grain Size on martensite–Austenite constituent and toughness in the heat affected zone of 700MPa high strength linepipe steel
Materials Science and Engineering: A, 2014Co-Authors: S V Subramanian, Chengjia Shang, R.d.k. MisraAbstract:Abstract Structure–mechanical property relationship studies were carried out on Gleeble simulated intercritically reheated coarse-Grained heat affected zone (ICCGHAZ) of 700 MPa linepipe steel microalloyed with Nb. The design of experiments was aimed at varying reheat temperature in the first pass to obtain different coarse Grain Size in the HAZ. This enabled the study of the effect of prior Austenite Grain Size on martensite–Austenite (M–A) constituent during the second pass reheating and its consequent influence on impact toughness. We elucidate here the role of phase transformation and the fraction, Size, shape, distribution, and carbon content of M–A constituent on impact toughness. The data suggests that the fraction of M–A constituent is not influenced by Grain Size, but the Size of M–A constituent is influenced by the prior Austenite Grain Size, which consequently governs toughness. Coarse Austenite Grain Size increases the Size of M–A constituent and lowers the HAZ toughness. Coarse Austenite Grain associated with coarse M–A constituent along Grain boundary is the dominant factor in promoting brittle fracture. The combination of fine prior Austenite Grain Size and smaller M–A constituent is favorable in obtaining high toughness. Good toughness is obtained on refining the prior Austenite Grain Size in the CGHAZ during first pass and hence ICCGHAZ in the second pass.
S V Subramanian - One of the best experts on this subject based on the ideXlab platform.
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influence of prior Austenite Grain Size on martensite Austenite constituent and toughness in the heat affected zone of 700mpa high strength linepipe steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: S V Subramanian, Chengjia Shang, R.d.k. MisraAbstract:Abstract Structure–mechanical property relationship studies were carried out on Gleeble simulated intercritically reheated coarse-Grained heat affected zone (ICCGHAZ) of 700 MPa linepipe steel microalloyed with Nb. The design of experiments was aimed at varying reheat temperature in the first pass to obtain different coarse Grain Size in the HAZ. This enabled the study of the effect of prior Austenite Grain Size on martensite–Austenite (M–A) constituent during the second pass reheating and its consequent influence on impact toughness. We elucidate here the role of phase transformation and the fraction, Size, shape, distribution, and carbon content of M–A constituent on impact toughness. The data suggests that the fraction of M–A constituent is not influenced by Grain Size, but the Size of M–A constituent is influenced by the prior Austenite Grain Size, which consequently governs toughness. Coarse Austenite Grain Size increases the Size of M–A constituent and lowers the HAZ toughness. Coarse Austenite Grain associated with coarse M–A constituent along Grain boundary is the dominant factor in promoting brittle fracture. The combination of fine prior Austenite Grain Size and smaller M–A constituent is favorable in obtaining high toughness. Good toughness is obtained on refining the prior Austenite Grain Size in the CGHAZ during first pass and hence ICCGHAZ in the second pass.
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Austenite Grain Size control in upstream processing of niobium microalloyed steels by nano scale precipitate engineering of tin nbc composite
Energy Materials 2014, 2014Co-Authors: S V Subramanian, Ma Xiaoping, Kashif RehmanAbstract:There is a growing demand for thicker gage pipes particularly for off-shore projects. Austenite Grain Size control in upstream processing before pancaking is essential to obtain excellent DBTT and DWTT properties in thicker gage product. This paper examines the basic science aspects of Austenite Grain Size control by nano-scale precipitate engineering.
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Influence of prior Austenite Grain Size on martensite–Austenite constituent and toughness in the heat affected zone of 700MPa high strength linepipe steel
Materials Science and Engineering: A, 2014Co-Authors: S V Subramanian, Chengjia Shang, R.d.k. MisraAbstract:Abstract Structure–mechanical property relationship studies were carried out on Gleeble simulated intercritically reheated coarse-Grained heat affected zone (ICCGHAZ) of 700 MPa linepipe steel microalloyed with Nb. The design of experiments was aimed at varying reheat temperature in the first pass to obtain different coarse Grain Size in the HAZ. This enabled the study of the effect of prior Austenite Grain Size on martensite–Austenite (M–A) constituent during the second pass reheating and its consequent influence on impact toughness. We elucidate here the role of phase transformation and the fraction, Size, shape, distribution, and carbon content of M–A constituent on impact toughness. The data suggests that the fraction of M–A constituent is not influenced by Grain Size, but the Size of M–A constituent is influenced by the prior Austenite Grain Size, which consequently governs toughness. Coarse Austenite Grain Size increases the Size of M–A constituent and lowers the HAZ toughness. Coarse Austenite Grain associated with coarse M–A constituent along Grain boundary is the dominant factor in promoting brittle fracture. The combination of fine prior Austenite Grain Size and smaller M–A constituent is favorable in obtaining high toughness. Good toughness is obtained on refining the prior Austenite Grain Size in the CGHAZ during first pass and hence ICCGHAZ in the second pass.
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Energy Materials 2014 - Austenite Grain Size Control in Upstream Processing of Niobium Microalloyed Steels by Nano-Scale Precipitate Engineering of TiN-NbC Composite
Energy Materials 2014, 2014Co-Authors: S V Subramanian, Ma Xiaoping, Kashif RehmanAbstract:There is a growing demand for thicker gage pipes particularly for off-shore projects. Austenite Grain Size control in upstream processing before pancaking is essential to obtain excellent DBTT and DWTT properties in thicker gage product. This paper examines the basic science aspects of Austenite Grain Size control by nano-scale precipitate engineering.
Alberto Quispe - One of the best experts on this subject based on the ideXlab platform.
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influence of Austenite Grain Size on recrystallisation precipitation interaction in a v microalloyed steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:Abstract By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation–precipitation–time–temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.
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Influence of Austenite Grain Size on recrystallisation–precipitation interaction in a V-microalloyed steel
Materials Science and Engineering: A, 2007Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation-precipitation-time-temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.Peer reviewe
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Influence of Austenite Grain Size on recrystallisation–precipitation interaction in a V-microalloyed steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:Abstract By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation–precipitation–time–temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.
Manuel Gómez - One of the best experts on this subject based on the ideXlab platform.
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influence of Austenite Grain Size on recrystallisation precipitation interaction in a v microalloyed steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:Abstract By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation–precipitation–time–temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.
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Influence of Austenite Grain Size on recrystallisation–precipitation interaction in a V-microalloyed steel
Materials Science and Engineering: A, 2007Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation-precipitation-time-temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.Peer reviewe
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Influence of Austenite Grain Size on recrystallisation–precipitation interaction in a V-microalloyed steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Alberto Quispe, Sebastián F. Medina, Manuel Gómez, J. I. ChavesAbstract:Abstract By means of torsion tests using small specimens, the influence of Austenite Grain Size on strain induced precipitation kinetics has been determined in a vanadium microalloyed steel. Determination of recrystallisation–precipitation–time–temperature (RPTT) diagrams for two Austenite Grain Sizes allows values of the aforementioned magnitudes to be determined. An ample discussion is made of the quantitative influence found and its relation with nucleation and growth mechanisms of precipitates. The results are compared with the quantitative influence exerted by the other variables, reaching the conclusion that the Austenite Grain Size has a notable influence on strain induced precipitation kinetics which should not be underestimated. Finally, the influence of Austenite Grain Size is included in a strain induced precipitation model constructed by the authors of this work and which also takes into account the other aforementioned variables.
