研究了铸态304L奥氏体不锈钢在等径角挤压(ECAP)变形过程中显微组织的演变过程.结果表明,经4道次剪切变形后树枝晶破碎、原始粗大晶粒碎化.显微组织的变化过程可归纳为:原始粗晶粒→晶粒被滑移带分割→位错发展形成高密度位错墙,与滑移带共同作用形成胞块结构→应变增加形成层片状界面→形成大角度晶界的细小晶粒.表明铸态304L奥氏体不锈钢经ECAP变形后塑性变形机制主要由滑移完成.
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