42CrMo钢等离子氮化和水射流喷丸复合处理  

Composite Treatment of Water Jet Shot Peening Combined with Plasma Nitriding on 42CrMo Steel

作　　者：范航京 梁益龙[1,2] 邹雄[1,2] 杜霈轩 胡君杰[1,2] 杨明[1,2] FAN Hang-jing LIANG Yi-long ZOU Xiong DU Pei-xuan HU Jun-jie YANG Ming(School of Materials Science and Metallurgical Engineering Guizhou Key Laboratory of Materials Strength and Struc- ture, Guizhou University, Guiyang 550025)

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州大学贵州省材料结构与强度重点实验室,贵阳550025

出　　处：《中国表面工程》2016年第6期23-29,共7页China Surface Engineering

基　　金：贵州省科技计划项目(黔科合JZ字[2014]2003;黔科合重大专项字(2014)6012)

摘　　要：利用真空脉冲等离子氮化技术,探究等离子氮化处理的最佳工艺参数;而后利用高压水射流喷丸技术研究了氮化前进行水射流喷丸预处理对氮化层的组织和性能的影响。采用光学显微镜、扫描电镜、X射线衍射仪等对氮化层的显微组织、形貌、含氮量、相成分进行检测和分析,采用XRD应力测定仪,表面粗糙度仪,显微硬度仪对渗氮层表面完整性进行了分析。结果表明：等离子氮化工艺最佳温度为530~540℃,等离子氮化后表面完整性（表面残余应力,粗糙度,表层硬度梯度,渗层形貌）得到改善。而经过复合处理使γ＇相衍射强度增强,氮化层均匀,渗层厚度增加超过100μm,进一步改善了等离子渗氮层质量和性能。The optimum parameters of plasma nitriding were explored by vacuum pulse plasma nitriding technology. Then, the effects of water jet shot peening before nitriding on the microstructure and properties of the nitrided layer were explored by water jet shot peening at high pressure technology. The microstructure, morphology, nitrogencontent, phase composition of the nitrided layer were examined and analyzed by the means of optical microscope, scanning electron microscopy and X-ray diffractometer. Additionally, the surface integrity of the nitrided layer was analyzed by the means of XRD residual stress tester, surface roughness tester and microhardness tester. The results show that the optimum temperature is from 530℃ to 540℃ and the surface integrity （surface residual stress, roughness, surface hardness gradient, and morphology） is refined after plasma nitriding. Compared with only plasma nitriding, composite treatment can not only enhance the diffraction intensity of ε and γ＇ phase, but also refine the nitrided layer thickness and uniformity. The thickness increases more than 100 μm after composite treatment. Therefore, the quality and property of the nitrided layer are also improved.

关 键 词：42CRMO钢 等离子氮化 水射流喷丸 复合处理 表面完整性 

分 类 号：TG156.8[金属学及工艺—热处理] TG668[金属学及工艺—金属学]