电磁纯铁表面渗氮工艺分析  

Surface nitriding process analysis of electromagnetic pure iron

作　　者：王佃刚 孙晓彤[1,2] 许文花 陈传忠[1,2] 吕宇鹏[1,2] Wang Dingang;Sun Xiaog;Xu Wenhua;Chen Chuanzhong;Li Yupeng(Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan Shandong 250061,China;School of Materials Science and Engineering,Shandong University,Jinan Shandong 250061,China)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]山东大学材料科学与工程学院,山东济南250061

出　　处：《金属热处理》2023年第11期127-132,共6页Heat Treatment of Metals

基　　金：山东省自然科学基金(ZR2022ME153);山东省重点研发计划(重大科技创新工程)(2021ZLGX01)

摘　　要：采用光学显微镜、扫描电镜、X射线衍射仪和显微硬度计等,对规格、尺寸相同的国内、进口电磁工件的表面及截面形貌、相组成、硬度等进行测试分析,根据Fe-N二元相图研究了两种工件的表面处理工艺。结果表明,两种样品的基体均为α纯铁,表面处理后的表面形貌和物相组成基本一致,但国内电磁工件扩散层之外只有一层由γ′-Fe相组成的厚度为8~9μm的白亮化合物层,其显微硬度为323 HV0.05,而进口电磁工件的白亮化合物层与扩散层之间存在一层厚度为12~13μm的过渡层,该过渡层为γ-Fe冷却后形成的屈氏体组织,显微硬度为312 HV0.05。可以推断,国内工件采用了常规低温(低于590℃)渗氮工艺,而进口工件由于渗层更深且存在由屈氏体组织组成的过渡层,其表面处理方法为高于590℃的高温离子渗氮工艺。Surface and cross-sectional morphology,phase composition and hardness of domestic and imported electromagnetic workpieces with the same specifications and dimensions were tested and analyzed by using optical microscope,scanning electron microscope,X-ray diffractometer and microhardness tester,and the surface treatment processes of the two type workpieces were studied based on the Fe-N binary phase diagram.The results show that the matrix of both specimens isαpure iron,and the surface morphology and phase composition after surface treatment are basically the same.However,there is only aγ′-Fe bright compound layer above the diffusion layer of the domestic electromagnetic workpiece,with a thickness of 8-9μm and a microhardness of 323 HV0.05.While there is a layer with a thickness of 12-13μm between the bright compound layer and the diffusion layer of the imported electromagnetic workpieces,and the transition layer with a microhardness of 312 HV0.05 is the troostite structure formed afterγ-Fe cooling.It can be inferred that domestic workpiece adopted a conventional low-temperature(below 590℃)nitriding process,while imported workpiece which has a deeper nitriding layer and a transition layer composed of troostite structure adopted a high-temperature ion nitriding process above 590℃.

关 键 词：Α-FE 电磁纯铁 渗氮工艺 屈氏体 过渡层 

分 类 号：TG156.8[金属学及工艺—热处理]