王明,谢尘,吴晓春

• 1:上海大学材料科学与工程学院

摘要(Abstract)：

将SDC99冷作模具钢在1030℃淬火之后在-130℃进行不同时间的低温处理,利用摩擦磨损试验研究了低温处理对SDC99钢耐磨性的影响规律,采用X射线衍射(XRD)和内耗分析了低温处理不同时间对SDC99钢微观组织的影响,并通过三维原子探针(3DAP)探究低温处理之后碳原子的扩散机制。结果表明:经过-130℃低温处理之后,SDC99钢磨损量降低,大部分残留奥氏体转变为马氏体,但不能完全转变;低温处理之后发现部分碳原子存在短程扩散,产生碳偏聚。残留奥氏体向马氏体转变和碳偏聚均可以改善SDC99钢的耐磨性。

关键词(KeyWords)： 冷作模具钢;低温处理;马氏体相变;碳偏聚;耐磨性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51171104)

作者(Author): 王明,谢尘,吴晓春

DOI: 10.13289/j.issn.1009-6264.2016.06.024

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