摘要
对2Cr13马氏体不锈钢分别进行常规直流离子渗氮和活性屏离子渗氮对比试验。渗氮温度均为440℃,渗氮时间为8 h。采用金相显微镜、扫描电镜、X射线衍射仪、表面粗糙度仪、显微硬度仪和电化学工作站等设备分析表征两种渗氮样品。实验结果表明:活性屏离子渗氮在避免了传统离子渗氮缺点的同时,取得了与其相同的硬化效果。可在马氏体不锈钢表面制备一定厚度的均匀致密的白亮层,其相结构是以ε-Fe_(2-3)N相为主,并伴随少量的αN相。马氏体不锈钢活性屏渗氮处理不仅可以提高表面硬度,而且获得了良好的耐蚀性能。
2Cr13 martensitic stainless steel was nitrided by direct current plasma nitriding（DCPN） and active screen plasma nitriding （ASPN） technology, respectively. Both of the experiments were carried out at 440 ℃ for 8 h in NH3 atmosphere of 420 Pa pressure. The specimens were characterized by optical microscopy, scanning electron microscopy and X-ray diffraction, microhardness and electrochemical testing measurement. The experimental results show that the ASPN process can achieve similar strengthen effect to that of DCPN, and many problems associated with the conventional DCPN can be eliminated. A uniform and compact white layer is formed by ASPN. The nitridied layers are mainly composed of ε-Fe2-3N N phase with some αN phase. It has been shown that active screen plasma nitriding provides an attractive process to improve the hardness and corrosion properties of 2Cr13 martensitic stainless steel.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第5期163-167,共5页
Heat Treatment of Metals
基金
国家重点基础研究发展计划(973计划)(2014CB046404)
国家自然科学基金(51301149)
中国博士后基金(2015M570090)
山东省自然科学基金(ZR2016EEP14)
关键词
马氏体不锈钢
离子渗氮
活性屏离子渗氮
电化学腐蚀
martensitic stainless steel
plasma nitriding
active screen plasma nitriding
electrochemical corrosion
