稀土元素Ce对AISI 410钢膏剂渗硼层组织与性能的影响  

Influence of rare earth element Ce on microstructure and properties of paste boronized layer of AISI 410 steel

作　　者：石铭霄[1] 徐清鹏 李敬勇[1] 茅卫东 李盛良 杨志东[1] SHI Ming-xiao;XU Qing-peng;LI Jing-yong;MAO Wei-dong;LI Sheng-liang;YANG Zhi-dong(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Chery New Energy Automobile Co Ltd,Wuhu 241003,China;Anhui Key Laboratory of New Energy Automobile Lightweight Technology,Wuhu 241003,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003 [2]奇瑞新能源汽车有限公司,安徽芜湖241003 [3]安徽省新能源汽车轻量化技术重点实验室,安徽芜湖241003

出　　处：《材料热处理学报》2024年第4期159-166,共8页Transactions of Materials and Heat Treatment

基　　金：江苏省高校自然科学基金(22KJA460011)。

摘　　要：钢的表面强化技术在各个工业领域的应用都具有重要的实际意义。渗硼技术是最经济的选择之一,然而,该技术存在的主要问题是难以获得厚且致密的渗硼层。为解决这一问题,在AISI 410不锈钢表面进行了添加6 mass%的CeO_(2)的膏剂渗硼处理。采用光学显微镜、扫描电镜、X射线衍射、摩擦磨损实验和电化学工作站等研究了渗硼层的组织、物相和耐蚀耐磨性能。结果表明:渗硼层的显微组织由外到内分别是FeB和Fe_(2)B。在渗硼剂中添加CeO_(2)可以使AISI 410不锈钢基体表面产生更厚、更致密的渗硼层,从而提高其耐磨性和耐蚀性。稀土元素铈的催化机理可以归结为两个方面。首先,添加CeO_(2)可以参与渗硼过程中的化学反应,从而产生更活跃的硼原子。二是由于Ce原子尺寸大,扩散到钢表面会产生严重的晶格畸变,从而促进了硼原子的扩散。The surface strengthening technology of steel has important practical significance in various industrial fields.Boronizing technology is one of the most economical options,however,the main problem with this technology is the difficulty in obtaining a thick and dense boronizing layer.To solve this problem,a paste boronizing treatment with 6 mass%CeO_(2) addition to the boronizing agent was performed on the surface of AISI 410 stainless steel.Microstructure,phase and corrosion and wear resistance of the boronized layer were studied by means of optical microscope,scanning electron microscopy,X-ray diffraction,friction and wear experiments,and electrochemical workstations.The results show that the microstructure of the boronized layer is FeB and Fe_(2)B from the outside layer to the inside layer,respectively.Adding CeO_(2) to the boronizing agent can prepare a thicker and denser boronizing layer on the surface of the AISI 410 stainless steel substrate,thereby improving its wear and corrosion resistance.The catalytic mechanism of rare earth element Ce can be attributed to two aspects.Firstly,the addition of CeO_(2) can participate in chemical reactions during boronizing,resulting in more active boron atoms.Secondly,due to the large size of Ce atoms,their diffusion to the steel surface will cause serious lattice distortion,thereby promoting the diffusion of boron atoms.

关 键 词：膏剂渗硼 二氧化铈 微观组织 耐磨性 耐蚀性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]