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用热力模拟实验机测定了不含Mo和Ni、含Mo不含Ni、含Mo和Ni 3种成分低合金耐磨钢的连续冷却转变(CCT)曲线,用光学显微镜、透射电镜观察了连续冷却过程中的显微组织,研究了连续冷却条件下的组织演变规律,分析了Mo和Ni元素对显微组织和硬度的影响.结果表明:随冷速的增加,试验钢的转变组织主要有铁索体、粒状贝氏体、板条贝氏体以及板条马氏体.Mo、Ni的添加使耐磨钢在低冷却速率下抑制了铁索体相变,促进了贝氏体相变;在高冷却速率下促进了马氏体相变,提高了临界冷却速率.Ni的添加对显微硬度的增加作用更明显.

参考文献

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