罗天放,陈荣刚,吴斌

• 1:陆军炮兵防空兵学院机械工程系

摘要(Abstract)：

为提高PCrNi3Mo钢的抗拉伸性能,采用等离子表面淬火技术对其进行表面处理。使用MTS拉伸试验机对PCrNi3Mo钢等离子淬火前后的拉伸性能进行对比分析,并对其在相同应变速率下得到的应力—应变曲线进行比较;使用X射线衍射仪对PCrNi3Mo炮钢表面的残余应力进行检测,使用光学显微镜观察其淬火后硬化区域的组织与形貌。结果表明:等离子淬火后PCrNi3Mo钢拉伸试样的屈服强度、拉伸强度比原始试样分别提高了27.3%和28.6%,断面收缩率、断后伸长率则下降了76.4%和69.4%;原始PCrNi3Mo钢试样断口处有明显的颈缩现象,为韧性断裂,而淬火试样韧性有明显提高但塑性变形能力下降;试样经过等离子淬火后表面由拉应力(496.9 MPa)转变为压应力(-942.2 MPa);淬火试样断面形成月牙形硬化带,月牙内部细密的马氏体组织代替了机体粗大的铁素体组织;淬火后形成的硬化层越深,炮钢材料抗拉强度越高。

关键词(KeyWords)： 等离子淬火;PCrNi3Mo炮钢;拉伸性能;残余应力;显微组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51475471)

作者(Author): 罗天放,陈荣刚,吴斌

DOI: 10.13289/j.issn.1009-6264.2018-0328

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