TY - GEN
T1 - Interfacial segregation during allotoriomorphic ferrite transformation in Fe-C-Mn alloy
AU - Amino, Takafumi
AU - Shigesato, Genichi
AU - Nozaki, Takayuki
AU - Azuma, Masafumi
PY - 2015
Y1 - 2015
N2 - In proeutectoid ferrite growth from austenite in low carbon steel, paraequilibrium (PE) mode and local-equilibrium (LE) mode have been suggested on the basis of the equilibrium theory. In addition, the transition from PE to LE modes has been confirmed during the ferrite growth. On the other hand, on the basis of the grain growth theory, it has been indicated that solute drag (SD) of substitutional alloying element affects deceleration of ferrite growth. In order to understand the effect of SD on the transition, time dependency of Mn concentration profiles at the regions across ferrite/austenite interface during isothermal transformation of Fe-0.12C-2.0Mn (mass%) was measured with sub-nm resolution analysis by means of Cs-STEM and EELS methods. The results show that Mn segregation at the ferrite/austenite interfaces occurs before Mn partitioning begins. It is suggested that the observation of kinetics that are slower than PE at short times does not imply the build-up of a spike or the partial transition to LE, rather it is due to the solute segregation to the interface and associated SD effect.
AB - In proeutectoid ferrite growth from austenite in low carbon steel, paraequilibrium (PE) mode and local-equilibrium (LE) mode have been suggested on the basis of the equilibrium theory. In addition, the transition from PE to LE modes has been confirmed during the ferrite growth. On the other hand, on the basis of the grain growth theory, it has been indicated that solute drag (SD) of substitutional alloying element affects deceleration of ferrite growth. In order to understand the effect of SD on the transition, time dependency of Mn concentration profiles at the regions across ferrite/austenite interface during isothermal transformation of Fe-0.12C-2.0Mn (mass%) was measured with sub-nm resolution analysis by means of Cs-STEM and EELS methods. The results show that Mn segregation at the ferrite/austenite interfaces occurs before Mn partitioning begins. It is suggested that the observation of kinetics that are slower than PE at short times does not imply the build-up of a spike or the partial transition to LE, rather it is due to the solute segregation to the interface and associated SD effect.
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M3 - Conference contribution
AN - SCOPUS:84962720735
T3 - PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
SP - 25
EP - 26
BT - PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
A2 - Chen, Long-Qing
A2 - Militzer, Matthias
A2 - Botton, Gianluigi
A2 - Howe, James
A2 - Sinclair, Chadwick
A2 - Zurob, Hatem
PB - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
T2 - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015
Y2 - 28 June 2015 through 3 July 2015
ER -