Computational simulation and Atomic scale investigation of two-step bainitic phase transformation kinetics in high carbon steel 100Cr6
In the present work,two-step heat treatment is stressed and an overall kinetics model is implemented to describe bainite transformation in high carbon steel DIN 100Cr6.In the kinetics model,the classical theory for nucleation is adopted and a simplified formulation of Trivedi equation for bainitic ferrite growth is applied,assuming para equilibrium at γ/αB interface.Bainite transformation kinetics hereby is described as a function of isothermal holding time and temperature.The calculated and experimental results show good agreements.Moreover,in order to better understand the nature of bainite transformation,atomic investigations are performed using Local field Electrode Atom Probe (LEAP).The atomic analysis results experimentally indicate that the nano cementite in lower bainite structure precipitates under para equilibrium condition.Substitutional elements,i.e.Cr,Si,Mn,distribute homogeneously in bainitic ferrite matrix and nano cementite.
bainite two-step transformation kinetics Atom Probe
Wenwen Song Ulrich Prahl Wolfgang Bleck
Department of Ferrous Metallurgy,RWTH Aachen University,Aachen 52072,Germany
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-5
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）