谢官利,迟宏宵,李祖来,马党参,周健,樊译,欧阳伟豪

• 1:昆明理工大学材料科学与工程学院
• 2:钢铁研究总院特殊钢研究所

摘要(Abstract)：

采用光学显微镜、扫描电镜、能谱仪、透射电镜、拉伸试验、冲击试验、盐雾腐蚀试验和相分析试验等研究了低温(240℃)和高温(500℃)回火对N合金化耐蚀塑料模具钢组织与性能的影响。结果表明：试验钢的组织均主要为回火马氏体，均析出了M_3C型碳化物。高温回火后试验钢的位错上析出了纳米级的M(CN)型碳氮化物以及M_(23)C_6碳化物，表明回火温度的升高可以促进氮化物的析出。低温回火和高温回火后试验钢的冲击吸收能量分别为32.4 J和10.4 J,断后伸长率变化不大，但是高温回火后试验钢的屈服强度与抗拉强度略有提升，并且大量碳氮化物在位错形核，增加了试验钢的解理断裂倾向。试验钢的腐蚀形式主要为点蚀，其低温回火后的耐腐蚀性远大于高温回火，腐蚀速率分别为0.005 g/(m~2·h)和0.026 g/(m~2·h);低温回火与高温回火后试验钢的自腐蚀电位分别为-0.08 V和-0.125 V,且后者的钝化膜极易破裂，这是由于在高温回火过程中，高合金含量的碳化物大量析出，且大多为富铬的M_3C或M_(23)C_6型碳化物，从而形成较多贫铬区，导致试验钢的耐腐蚀性能降低。

关键词(KeyWords)： 耐蚀塑料模具钢;氮合金化;碳氮化物;盐雾腐蚀

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 谢官利,迟宏宵,李祖来,马党参,周健,樊译,欧阳伟豪

DOI: 10.13289/j.issn.1009-6264.2021-0377

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