利用XRD、高分辨透射电镜等试验方法,结合内耗法研究深冷处理对80Cr9Mo2钢回火特性影响.结果表明:深冷处理前低温回火将导致部分碳原子由马氏体相扩散至残留奥氏体相中,提高残留奥氏体稳定性.而回火前深冷处理将导致更多残留奥氏体相变为低温马氏体,马氏体相(包括低温马氏体相)含量增加,可动位错密度提高,位错处偏聚间隙碳原子含量提高.有利于回火过程中析出更多数量的细小碳化物,这是深冷处理提高耐磨性能的主要原因.
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