摘要
以常用齿轮钢42CrMo为研究材料,采用不同空气流量对其进行离子氮氧共渗,并与传统离子渗氮进行对比。利用光学显微镜、XRD和电化学工作站对渗层的显微组织、物相和耐蚀性进行了测试和分析。研究结果表明,在550℃+4h相同温度和时间条件下,离子氮氧共渗化合物层比传统离子渗氮渗层厚度增加50%以上,氮化疏松层级别提高到12级;同时,离子氮氧共渗后渗层最表层形成了一薄层Fe3O4,使耐蚀性得到显著提高,0.3L/min为最佳空气流量。该研究可为改进42CrMo表面改性工艺方案提供参考。
In order to enhance the nitriding efficiency,42CrMo steel was selected as the testing material.Plasma oxynitriding using different air flow in the same pulsed plasma nitriding system for 42CrMo steel was investigated innovatively,and compared with conventional plasma nitriding processing.The cross-sectional microstructures,phases,corrosion resistance were determined by optical microscopy,X-ray diffraction,microhardness tester and electrochemical workstations.The results show that plasma oxynitriding owns much higher efficiency compared with plasma nitriding,thus makes thicker compound layer under the same other conditions.Meanwhile,higher porosity of nitrided layer is obtained.Furthermore,corrosion resistance can be significantly improved due to chemically stable formation and compact Fe3O4 oxide in the compound layer during plasma oxynitriding process,and air flow of 0.3L/min offers the optimum performance for 42CrMo steel due to highest ratio of Fe3O4 to Fe2O3.This research can provide a reference for improving the surface modification process of 42CrMo.
作者
缪小吉
武计强
梅文臣
孙斐
徐磊
张玉龙
胡静
MIAO Xiaoji;WU Jiqiang;MEI Wenchen;SUN Fei;XU Lei;ZHANG Yulong;HU Jing(Department of Mechanical Engineering,Changzhou Institute of Industry Technology,Changzhou 213164,China;National Demonstration Center for Experimental Materials Science and Engineering Education,Changzhou University,Changzhou 213164,China;Sinopec Oilfield Equipment Corporation,Wuhan 430223,China)
出处
《航空制造技术》
2019年第21期64-68,共5页
Aeronautical Manufacturing Technology
基金
国家自然科学基金(51774052,21978025)
江苏省第三期优势学科建设项目(PAPD-3)
江苏高校品牌专业建设工程资助项目(TAPP)
江苏省研究生科研与实践创新计划项目(SJCX18-0955)
关键词
表面改性
离子渗氮
氮氧共渗
氮化疏松层
耐蚀性
42CrMo
Surface modification
Plasma nitriding
Plasma oxynitriding
Porosity of nitrided layer
Corrosion resistance
42CrMo
