采用深冷轧制技术对AISI 310S奥氏体不锈钢进行不同变形量的实验,借助OM、SEM、TEM、XRD及微拉伸试验等方法研究了不同变形量下奥氏体不锈钢的组织特性及性能变化规律.结果表明:奥氏体不锈钢在深冷轧制不同变形量下均未发生应变诱发马氏体相变,在变形量为30％时,组织内部出现高密度位错且夹杂少量的形变孪晶,随着变形量增大至70％时,组织内部出现大量形变孪晶,孪晶与位错的交互作用显著加剧;到变形量为90％时,晶粒完全碎化至纳米量级.而且随着变形量的增大,强度指标大幅度上升,屈服强度、抗拉强度分别从原始态的305 MPa、645 MPa增加至1099 MPa、1560 MPa;而伸长率则从40.8％(原始)下降至6.4％(变形量90％),拉伸断口由韧性断裂向准解理断裂转变.
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