配分过程中低碳硅锰系Q＆P钢残余奥氏体研究  

Study on Retained Austenite of Low Carbon Si-Mn Q&P Steel During Partitioning

作　　者：陈连生[1] 杨栋[1] 田亚强[1] 宋进英[1] 赵远[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：《钢铁钒钛》2014年第6期97-101,共5页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金资助项目(51254004);河北省高等学校科学技术研究项目(YQ2013003)

摘　　要：采用场发射扫描电镜和X射线衍射仪研究配分过程中低碳硅锰系Q&P钢的组织演变规律,分析残余奥氏体含量的变化规律及其与Q&P钢塑性之间的关系。结果表明:配分温度在450℃以上和配分时间在200 s以上都会使马氏体和残余奥氏体发生分解,并伴有大量的白色粒状碳化物析出。配分温度和配分时间决定室温下残余奥氏体的含量,配分温度在400℃左右和配分时间在30 s左右,配分过程中残余奥氏体中的碳含量较高,最终稳定到室温的残余奥氏体含量增加;残余奥氏体含量随着配分温度的升高呈先升高后下降的趋势,随配分时间的延长呈逐渐下降的趋势,延伸率与残余奥氏体含量的变化趋势相似。Microstructure evolution of low carbon Si-Mn Q＆P steel during partitioning had been investiga-ted by means of SEM and X-ray diffraction, and variation of retained austenite content and its effects onthe plasticity of Q＆P steel had been characterized. The results show that partition temperature above 450℃ and the partition time longer than 200 s cause martensite and retained austenite decomposition, atsame time lots of white granular carbide precipitate. The partition temperature and partition time deter-mine the content of residual austenite at room temperature. When partition temperature is about 400 ℃and partition time is about 30 s, carbon content of retained austenite is higher during partition process,and the content of residual austenite at room temperature increase. With increasing partition temperature,content of residual austenite increases at first and then decreases, while it gradually decreases with theextension of partition time. Elongation and residual austenite content show similar change trend.

关 键 词：Q&P钢 残余奥氏体 碳配分 

分 类 号：TG115[金属学及工艺—物理冶金] TG142.1[金属学及工艺—金属学]