低碳硅锰钢双相区组织演变及C、Mn配分热力学的研究  

Study on Microstructure Evolution of Dual Phase Region and Thermodynamics of C, Mn Partitioning of Low Carbon Si-Mn Steel

作　　者：魏英立 李然 宋进英 张宏军 田亚强 陈连生 

机构地区：[1]华北理工大学河北省现代冶金技术重点实验室,河北唐山063009

出　　处：《热加工工艺》2016年第16期154-156,160,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51254004);河北省自然科学基金项目(E2014209191);河北省教育厅科研资助项目(YQ2013003)

摘　　要：利用Thermo-calc计算,采用双相区保温淬火(I&Q)工艺对低碳硅锰钢双相区等温过程中的组织演变和C、Mn配分热力学进行了研究。结果表明:在双相区,C、Mn在奥氏体中的固溶度随温度升高呈递减趋势且远大于铁素体,为C、Mn配分提供了热力学条件;在800℃等温不同时间后淬火,室温组织为铁素体、马氏体加少量M/A岛,等温30 min时接近平衡相变;双相区等温过程中C、Mn由铁素体向奥氏体中配分,使得部分小的奥氏体晶粒热稳定性提高,淬火后形成室温残余奥氏体。The microstructure evolution in isothermal process of two phase region and thermodynamics of C, Mn partitioning of low carbon Si-Mn steel were studied with Thermo-calc calculation by using I ＆ Q process. The results show that during two phase region, the solubility of C, Mn in austenite decreases progressively with temperature increasing and the solubility is grater than that in ferrite, which provides thermodynamic condition for C, Mn partitioning; when quenching after 800＂C for different time, the room temperature microstmcture is ferfite, martensite and a small amount M/A islands and it closes to equilibrium phase transformation during the isothermal time of 30min; C, Mn partition from ferrite to austenite during two phase region isothermal process, resulting in the enhancement of thermal stability of some small austenite grains, which forms retained austenite after quenching.

关 键 词：低碳硅锰钢 双相区等温 组织演变 C、Mn 配分 热力学 

分 类 号：TG156.1[金属学及工艺—热处理] TG115.21[金属学及工艺—金属学]