Numerical Analysis of Medium Manganese Steel in Batch and Continuous Annealing
Based on the hot-rolled microstructure of medium manganese steel,the geometry and boundary conditions of modeling intercritical austenitization were established.The simulation results show that the supersaturated carbon and manganese atoms in martensite can quickly partition from ferrite to austenite and segregate in austenite near the phase interface at the beginning.During the proceeding transformation,carbon concentration is then homogenized rapidly in austenite,but the Mn profile in austenite shows a larger gradient.The interface velocity at the beginning is several orders of magnitude higher than that at the latter stage as it decreases very rapidly.The interface migration in the early transformation stage is dominated by the carbon diffusion,and then gradually controlled by the Mn diffusion in austenite with the proceeding reverse transformation.The increasing temperature can lead to significantly faster interface velocity.On the condition of the same amount of austenite formed,the low temperature and the long-time annealing are both beneficial for Mn to diffuse from ferrite to austenite and be enriched in austenite,which will improve the stability of austenite.
medium manganese steel annealing matensite austenitization diffusion
KUANG Shuang QI Xiumei HAN Yun LIU Huasai
Shougang Institute of Technology, Beijing 100043, China
国际会议
成都
英文
217-220
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）