低碳硅锰系Q&P钢增塑机制及组织性能  

Low Carbon Si-Mn Q&P Steel Plasticity Enhancement Mechanisms and Microstructure Property

作　　者：陈连生[1] 赵远[1] 田亚强[1] 宋进英[1] 魏英立[1] 杨栋[1] 

机构地区：[1]河北联合大学河北省现代冶金技术重点实验室,河北唐山063009

出　　处：《材料工程》2014年第6期5-10,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51254004);河北省自然科学基金资助项目(E2014209191);河北省教育厅资助科研项目(YQ2013003)

摘　　要：采用双相区保温-淬火-配分工艺对低碳硅锰钢进行处理,通过场发射扫描电镜、X射线衍射仪和拉伸实验等对该Q&P钢增塑机制及其组织性能进行研究。结果表明:实验用钢经双相区保温-淬火-配分处理后,综合力学性能优于传统Q&P钢;双相区合理的保温时间可以减少室温组织中二次淬火马氏体含量,以保证更好的塑性;实验用钢经Q&P工艺处理后室温残余奥氏体含量为4.9%,而经双相区保温-淬火-配分处理时,随着双相区保温时间的延长,室温残余奥氏体含量呈先增加后减少的趋势,在双相区720℃保温1500s再经Q&P处理后残余奥氏体含量达到最大值7.3%,综合力学性能最佳。Low carbon Si-Mn steel was processed through intercritical insulation-quenching-partitioning. The plasticity enhancement mechanisms and organizational performance of the Q＆P steel were studied by means of field emission scanning electron microscopy, X-ray diffraction and tensile tests. The results show that after intercritical insulation-quenching-partitioning, the steel demonstrates superior comprehensive mechanical property to traditional Q＆P steel. Reasonable intercritical insulation time can reduce the secondary quenching martensite content in the organization, so as to ensure better plasticity. The content of retained austenite in the steel is 4.9% after Q＆P processing. With the ex- tension of the intercritical insulation time, the content of retained austenite in the steel first increases and then decreases after intercritical insulation-quenching-partitioning. When the steel is intercriticall- ly insulated at 720℃ for 1500s, and is then quenched and partitioned, the content of retained austenite in the steel reaches the maximum 7.3 %, and the comprehensive mechanical property of the steel is the best.

关 键 词：Q&P钢 残余奥氏体 Mn配分 力学性能 强塑积 

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]