42CrMo钢的钛催渗等离子渗氮工艺  

Ti-catalyzed plasma nitriding process of 42CrMo steel

作　　者：钟厉[1] 王佐钰 门昕皓 韩西[1] Zhong Li;Wang Zuoyu;Men Xinhao;Han Xi(School of Mechatronics and Vehicle Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学机电与车辆工程学院,重庆400074

出　　处：《金属热处理》2023年第5期252-258,共7页Heat Treatment of Metals

基　　金：重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0749);重庆市研究生导师团队建设项目(JDDSTD2019007);重庆市研究生联合培养基地项目(JDLHPYJD2020031)。

摘　　要：研究了不同渗氮时间下钛元素对42CrMo钢常规离子渗氮工艺的作用效果,表征分析了不同渗氮工艺下试样表面的渗层组织及性能。结果表明,钛催渗离子渗氮试样的表面硬度和渗层深度均明显高于常规离子渗氮。在535℃×3 h的工艺条件下,钛催渗离子渗氮试样渗层的表面硬度达到887.4 HV0.2,渗氮层厚度约为400μm。钛元素的加入促进了氮元素的渗透和扩散,在试样表面生成高硬度化合物TiN。相较于相同保温时间下的常规离子渗氮,钛催渗离子渗氮试样表面硬度提高了60 HV0.2,渗层厚度增加了80μm,渗氮效率提升了约25%。与常规离子渗氮相比,钛催渗离子渗氮工艺具有显著优势,不仅有利于改善渗层组织性能,增强渗氮效果,还提高了渗氮效率,使渗氮周期明显缩短。Effect of titanium on conventional plasma nitriding process of 42CrMo steel under different nitriding time was studied.The microstructure and hardness of the nitrided layers on specimen under different nitriding processes were characterized and analyzed.The results show that the surface hardness and nitrided layer depth of the titanium-catalyzed plasma nitrided specimen are obviously higher than those of the conventional plasma nitrided specimen.Under the process condition of 535℃×3 h,the surface hardness and the depth of the nitrided layer reach 887.4 HV0.2 and 400μm,respectively.The addition of titanium promotes the infiltration and diffusion of nitrogen,and generates high hardness compound TiN on the surface.Compared with the conventional plasma nitriding under the same nitriding time,the surface hardness and the depth of the nitrided layer are increased by 60 HV0.2 and by 80μm,respectively,and the nitriding efficiency is increased by about 25%.The titanium-catalyzed plasma nitriding process has more significant advantages than conventional plasma nitriding,which not only improves the microstructure and hardness of the nitrided layer,enhances the nitriding effect,but also improves the nitriding efficiency and significantly shortens the nitriding cycle.

关 键 词：42CRMO钢 钛催渗等离子渗氮 显微组织 硬度 

分 类 号：TG156.82[金属学及工艺—热处理]