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202 nm；抗拉强度和屈服强度大大提高(Rp02=1 002 MPa，Rm=1 100 MPa)，但均匀塑性变形能力(A＜3%)和加工硬化指数(n=0060)却显著下降。
The microstructure evolution of ascast 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 workhardening exponential decreased rapidly (the uniform elongation was ＜3% and workhardening exponential was 0060 after 4 passes).
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