冷轧处理316L不锈钢的晶粒细化机制  

Grain Refinement Mechanism in 316L Stainless Steel Treated by Cold Rolling

作　　者：魏康 李建生 秦文波[2] 刘艳芳 高波 毛庆忠 WEI Kang;LI Jiansheng;QIN Wenbo;LIU Yanfang;GAO Bo;MAO Qingzhong(Nano and Heterogeneous Materials Center,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]南京理工大学材料科学与工程学院纳米异构材料中心,江苏南京210094 [2]中国地质大学(北京)工程技术学院,北京100083

出　　处：《材料科学与工程学报》2020年第5期701-705,共5页Journal of Materials Science and Engineering

基　　金：江苏省研究生科研与实践创新计划资助项目(KYCX18_0414)。

摘　　要：采用冷轧变形处理316L奥氏体不锈钢,研究了材料中微观形变组织和晶粒细化机制。利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)研究了冷轧后不锈钢试样的显微组织、相组成变化及微观结构演变。研究表明:经冷轧处理后316 L不锈钢试样出现形变孪晶组织,孪晶片层厚度随着变形量的增加逐渐变窄;奥氏体发生形变诱导马氏体相变,且马氏体含量随着应变量的增大而增多。晶粒细化过程由剪切带切割片层超细晶及纳米孪晶束主导,最终形成以奥氏体相为主的双相超细/纳米晶组织。Deformed microstructures and grain refinement mechanism were investigated for the 316L austenitic stainless steel samples treated by cold rolling.The microstructures,phase composition evolution and microstructure evolution of the treated samples were firstly characterized by some conventional technique including TEM.The results indicate that the deformation twins are observed in 316L stainless steel sample after cold rolling,and twin lamellar thickness decreases gradually with the increasing of the rolling strain.Meanwhile,deformation-induced martensite transformation occurs in austenitic grains,and the martensite amount also increases with the increase of the rolling strain.Shear bands cutting lamellar ultra-fine grains and nano-scale twins plays the leading role during grain refinement process.Finally,dual phase ultra-fine/nanocrystalline grained structures with most austenite are achieved in the 316 L stainless steel samples.

关 键 词：冷轧处理 316L不锈钢 形变诱导马氏体相变 晶粒细化 

分 类 号：TG407[金属学及工艺—焊接]