李坤茂,颜志斌,刘静,李振鹏,吴旋

• 1:贵州师范大学材料与建筑工程学院
• 2:贵州大学材料与冶金学院

摘要(Abstract)：

采用光学显微镜、端面磨损实验机、显微硬度仪和X射线衍射仪(XRD)等分析测试了20CrMnTi钢经离子渗氮与感应渗氮后渗氮层的组织、耐磨性、硬度及相组成,同时利用光学显微镜对渗氮层的截面形貌进行分析,以及用SEM对渗氮层磨损后的磨痕形貌进行分析。结果表明:通过两种渗氮处理后,20CrMnTi钢表面均可获得Fe_2N、Fe_3N等氮化物;随着渗氮温度的升高渗层深度增加,且在相同温度下感应渗氮后的白亮层厚度高于离子渗氮后的白亮层厚度;感应渗氮和离子渗氮后20CrMnTi钢表面最高硬度分别为960 HV0.25和800 HV0.25。感应渗氮后20CrMnTi钢的磨损率从5.95×10~(-6) cm~3·min~(-1)·N~(-1)降至4.85×10~(-7) cm~3·min~(-1)·N~(-1);离子渗氮后的磨损率从5.95×10~(-6) cm~3·min~(-1)·N~(-1)降至6.13×10~(-7) cm~3·min~(-1)·N~(-1)。20CrMnTi钢渗氮前磨损面有大量剥离区,磨损机制为典型的粘着磨损;渗氮处理后磨损面比较平滑,有少量犁沟,磨损机制主要为磨粒磨损。

关键词(KeyWords)： 20CrMnTi钢;感应氮化;离子氮化;组织结构;耐磨性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51574096,51464008);; 贵州省优秀青年科技人才培养项目(黔科合平台人才[2016]5607号,黔发改投资[2017]1562号);; 贵州省科技计划(黔科合JZ字[2014]2003)

作者(Author): 李坤茂,颜志斌,刘静,李振鹏,吴旋

DOI: 10.13289/j.issn.1009-6264.2018-0234

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