Predicting the Fraction of Austenite after Intercritical Annealing in Medium-Mn Steels
The medium Mn steels (2~10 wt% Mn) show high strength and high elongation,mainly due to their very fine microstructure and large fraction of retained austenite,and these steels are considered as potential application in automotive industry.The most critical part in the production of medium Mn steels is an intercitical annealing process at the ferrite/austenite dual phase temperature region.During the annealing,the as-quenched martensite partially transforms to austenite,with C and Mn partitioning from martensite to austenite,and this leads to a very fine lamellar microstructure of ferrite (or tempered martensite) and austenite1.Since the mechanical properties are highly dependent on the fraction and the stability of austenite,it is very important to model the transformation of martensite to austenite during intercritical annealing,aiming to further design the steels.The present study models the growth of austenite from as-quenched martensite with a lamellar structure in Fe-C-Mn steels,taking into account the influence of cementite precipitation and the finite mobility of the martensite/austenite interface.
martensite austenite medium Mn steel intercritical annealing
FEI Huyan YAN Jiayi (A)GREN John BORGENSTAM Annika
Department of Materials Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
国际会议
成都
英文
739-740
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）