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(Rp0.2=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=0.060)却显著下降.
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