31CrMoV9钢深层渗氮工艺研究  

Study of Deep Nitriding Process for 31CrMoV9 Steel

作　　者：郁俐[1] 涂小龙[1] 陈云祥[2] YU LI TU Xiaolong CHEN Yunxiang(Hangzhou Advance Gearbox Group Co., Ltd., Hangzhou 311203, China Zhejiang Institute of Mechanical ＆ Electrical Engineering, Hangzhou 310053, China)

机构地区：[1]杭州前进齿轮箱集团股份有限公司,浙江杭州311203 [2]浙江机电职业技术学院,浙江杭州310053

出　　处：《铸造技术》2017年第3期573-576,共4页Foundry Technology

摘　　要：对31CrMoV9钢在500~520℃氮势分段可控渗氮工艺进行了研究。结果表明:31CrMoV9钢在520℃深层渗氮,强渗期高氮势,扩散期低氮势的渗氮工艺,获得深硬化层,渗氮时间较短,表面硬度高,表面脆性Ⅰ级;在500℃~510℃渗氮,强渗8 h,氮势K_n=5.0~6.5,扩散4 h,K_n=1.5~2.5,渗氮后,渗氮层表面硬度800~860 HV,硬化层深度0.19~0.22 mm,表面脆性Ⅰ级;在515~520℃渗氮,强渗8 h,K_n=5.0~6.5,扩散4 h,K_n=1.5~2.5,渗氮后,渗氮层表面硬度710~800 HV,硬化层深度0.24~0.28 mm,表面脆性Ⅰ级。The process of nitrogen potential subsection control nitriding at 500 ℃-520 ℃ for 31CrMoV9 steel was studied. The results show that the deep nitriding process for 3 I CrMoV9 steel at 520 ℃, with high nitrogen potential at strong nitriding stage and low nitrogen potential at diffusion stage, has short nitriding time and high surface hardness, the surface brittleness of 31CrMoV9 steel is level I ; strong nitriding for 8 h at 500 ℃-510 ℃, Kn=5.0-6.5, after diffusion for 4 h, Kn=1.5-2.5, the surface hardness is 800-860 HV, the depth of hardened layer is 0.19-0.22 mm, the surface brittleness is level I ; strong nitriding for 8 h at 515-520 ℃, Kn=5.0-6.5, after diffusion for 4 h, Kn=1.5-2.5,the surface hardness is 710-800 HV, the depth of hardened layer is 0.24-0.28 mm, the surface brittleness is level I .

关 键 词：31CrMoV9 分段可控渗氮 渗氮层 脆性 硬度 

分 类 号：TG156.82[金属学及工艺—热处理]