回火温度对超低碳7%Mn钢组织与性能的影响  

Effect of tempering temperature on microstructure and properties of ultra low carbon 7%Mn steel

作　　者：杨跃辉[1] 苑少强[1] 梁国俐[1] 王竚 Yang Yuehui;Yuan Shaoqiang;Liang Guoli;Wang Zhu(Hebei Province Key Lab of Intelligent Equipment Digital Design and Process Simulation,Tangshan University,Tangshan Hebei 063000,China;Department of Basic Courses,Tangshan University,Tangshan Hebei 063000,China)

机构地区：[1]唐山学院河北省智能装备数字化设计及过程仿真重点实验室,河北唐山063000 [2]唐山学院基础部,河北唐山063000

出　　处：《金属热处理》2021年第10期168-172,共5页Heat Treatment of Metals

基　　金：河北省高端钢铁冶金联合研究基金(E2019105101);唐山市科技计划(18130218a)。

摘　　要：对超低碳中锰钢进行了淬火+回火处理,研究了不同温度回火后试验钢的显微组织及力学性能,采用XRD法测定了低温处理(-60、-80、-100℃)前后试验钢中的逆转变奥氏体含量,在此基础上分析了逆转变奥氏体含量及热稳定性对试验钢力学性能的影响规律。结果表明:采用较高温度回火时,促进了逆转变奥氏体的形成,也使奥氏体稳定化元素快速富集于其中,而且随温度升高所得奥氏体更多分布于粗化的马氏体板条之间,故具有更高的稳定性;由于试验钢中逆转变奥氏体含量较多,变形过程中的TRIP效应更为显著,促进了试验钢低温韧性和塑性的提高。Microstructure and mechanical properties of the ultra low carbon medium manganese steel after quenching and tempering at different temperatures were studied,and the amount of reversed austenite in the tested steel before and after low temperature treatment(-60℃,-80℃and-100℃)was measured by means of XRD.Based on this,the effect of reversed austenite content and thermal stability on mechanical properties of the tested steel was analyzed.The results show that higher temperature tempering promotes the formation of reversed austenite,in which the austenite stabilizing elements are quickly enriched.Meanwhile the austenite obtained at higher tempering temperature is more distributed between the coarsened martensitic laths,which makes the austenite have high stability.Due to the more reversed austenite in the tested steel,the TRIP effect is more significant in the process of deformation,which promotes the improvement of low temperature toughness and plasticity of the tested steel.

关 键 词：超低碳7%锰钢 逆转变奥氏体 低温韧性 

分 类 号：TG162.83[金属学及工艺—热处理]