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R.d.k. Misra - 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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influence of prior austenite grain size on martensite austenite constituent and toughness in the heat affected zone of 700 mpa high strength linepipe steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Xueda Li, 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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influence of prior austenite grain size on martensite austenite constituent and toughness in the heat affected zone of 700 mpa high strength linepipe steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Xueda Li, 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.
Chengjia Shang - 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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influence of prior austenite grain size on martensite austenite constituent and toughness in the heat affected zone of 700 mpa high strength linepipe steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Xueda Li, 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.
Stephen M West - One of the best experts on this subject based on the ideXlab platform.
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freeze in production of fimp dark matter
Journal of High Energy Physics, 2010Co-Authors: Lawrence J Hall, Karsten Jedamzik, John Marchrussell, Stephen M WestAbstract:We propose an alternate, calculable mechanism of dark matter genesis, “thermal freeze-in”, involving a Feebly Interacting Massive Particle (FIMP) interacting so feebly with the thermal bath that it never attains thermal equilibrium. As with the conventional “thermal freeze-out” production mechanism, the relic abundance reflects a combination of initial thermal distributions together with particle masses and couplings that can be measured in the laboratory or astrophysically. The freeze-in yield is IR dominated by low Temperatures near the FIMP mass and is independent of unknown UV physics, such as the Reheat Temperature after inflation. Moduli and modulinos of string theory compactifications that receive mass from weak-scale supersymmetry breaking provide implementations of the freeze-in mechanism, as do models that employ Dirac neutrino masses or GUT-scale-suppressed interactions. Experimental signals of freeze-in and FIMPs can be spectacular, including the production of new metastable coloured or charged particles at the LHC as well as the alteration of big bang nucleosynthesis.
Lawrence J Hall - One of the best experts on this subject based on the ideXlab platform.
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freeze in production of fimp dark matter
Journal of High Energy Physics, 2010Co-Authors: Lawrence J Hall, Karsten Jedamzik, John Marchrussell, Stephen M WestAbstract:We propose an alternate, calculable mechanism of dark matter genesis, “thermal freeze-in”, involving a Feebly Interacting Massive Particle (FIMP) interacting so feebly with the thermal bath that it never attains thermal equilibrium. As with the conventional “thermal freeze-out” production mechanism, the relic abundance reflects a combination of initial thermal distributions together with particle masses and couplings that can be measured in the laboratory or astrophysically. The freeze-in yield is IR dominated by low Temperatures near the FIMP mass and is independent of unknown UV physics, such as the Reheat Temperature after inflation. Moduli and modulinos of string theory compactifications that receive mass from weak-scale supersymmetry breaking provide implementations of the freeze-in mechanism, as do models that employ Dirac neutrino masses or GUT-scale-suppressed interactions. Experimental signals of freeze-in and FIMPs can be spectacular, including the production of new metastable coloured or charged particles at the LHC as well as the alteration of big bang nucleosynthesis.