铸态304L奥氏体不锈钢等径角挤压变形的力学性能  

Mechanical Properties of As-Cast 304L Austenitic Stainless Steel During Equal Channel Angular Pressing

作　　者：邓波[1] 杨钢[2] 张凌义[1] 王立民[2] 

机构地区：[1]昆明理工大学材料与冶金工程学院,云南昆明650093 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《钢铁研究学报》2008年第3期40-44,共5页Journal of Iron and Steel Research

基　　金：国家高新技术(863计划)研究发展计划资助项目(2002AA302501)

摘　　要：研究了经1～4道次等径角挤压变形（ECAP）后，铸态304L奥氏体不锈钢微观结构的演变，同时测定了ECAP变形后的力学性能。结果表明，经4道次变形后，铸态粗大晶粒破碎形成细小的大角度晶粒，平均晶粒尺寸约202nm抗拉强度和屈服强度大大提高（Rp0.2=1002MPa，Rm=1100MPa），但均匀塑性变形能力（A〈3％）和加工硬化指数（n=0．060）却显著下降。The microstructure evolution of as-cast 304L austenitic stainless steel during equal channel angular pressing （ECAP） from 1-4 passes was investigated. At the same time, room temperature tensile tests were performed to study the mechanical properties. The results show that the initial coarse grains were refined to submicron sized grains with average grain size of -202 nm after 4 passes. The yield and ultimate strengths of ECAPed 304L increased sharply （the yield strength was 1 002 MPa, the ultimate strength was 1 100 MPa after 4 passes）, while the uniform elongation and work-hardening exponential decreased rapidly （the uniform elongation was 〈3 % and work-hardening exponential was 0. 060 after 4 passes）.

关 键 词：奥氏体不锈钢 等径角挤压变形 力学性能 

分 类 号：TG376[金属学及工艺—金属压力加工]