含Cu低碳钢双相区形变+IQ处理的组织及Cu配分行为  

Microstructure and Cu partitioning behavior in intercritical deformation plus IQ process of Cu-bearing low carbon steel

作　　者：陈连生[1] 胡宝佳 田亚强[1] 董福涛[1] 李红斌[1] 魏英立[1] 宋进英[1] 

机构地区：[1]华北理工大学教育部现代冶金技术重点实验室,河北唐山063009

出　　处：《金属热处理》2017年第7期51-54,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51574107;51501056);河北省自然科学基金(E2017209048;E2015209243);河北省高等学校科学技术研究项目(QN2016185);华北理工大学研究生创新项目(2016S26)

摘　　要：采用双相区保温-淬火(IQ)及双相区形变-保温-淬火热处理工艺,研究了形变对一种含Cu低碳钢的组织演变及其Cu配分行为的影响。采用光学显微镜(OM)、扫描电镜(SEM)及电子探针(EPMA)等手段对组织演变及Cu配分行为进行了表征。结果表明:IQ工艺处理后,试验钢由多边形铁素体和珠光体的初始组织转变为铁素体和马氏体双相组织,少量多边形铁素体转变形板条马氏体;双相区形变+IQ处理后组织中多边形铁素体由于形变力作用发生微小变形且含量降低,板条马氏体含量显著增加;IQ工艺下组织中含Cu最高区域的Cu元素平均浓度为0.896,而采用双相区形变+IQ处理的组织中为1.025,是基体平均Cu浓度的2.5倍,且其富Cu区域面积比为23.8%。上述结果表明,通过IQ处理前的形变处理提高空位浓度,可以有效促进Cu配分效果。Effect of deformation on microstructure evolution and Cu partitioning behavior of a Cu bearing low carbon steel were studied by means of intercritical heating-quenching（ IQ） process and intercritical deformation plus heating-quenching process. The microstructure and Cu partitioning behavior of the steel was characterized by means of OM,SEM and EPMA. The results show that the initial microstructure of the tested steel is changed from polygonal ferrite and pearlite to ferrite and martensite dual phase microstructure after the IQ process. After treated by intercritical deformation plus IQ process,the amount of polygonal ferrite is reduced,and that of lath martensite is significantly increased. The average concentration of Cu elements in the highest Cu rich area of the steel treated by intercritical deformation plus IQ process is 1. 025,increased by 150% than that in matrix,and the highest Cu rich area fraction is 23. 8%,while the average concentration of Cu elements treated by IQ process is only 0. 896. The results show that the increase of the concentration of vacancies can effectively promote the effect of Cu partitioning behavior by deformation.

关 键 词：双相区形变 Cu配分 马氏体 空位 

分 类 号：TG142.31[一般工业技术—材料科学与工程]