渗碳工艺对摆线轮组织和性能的影响  

THE INFLUENCE OF CARBURIZATION PROCESS ON THE MICROSTRUCTURE AND PROPERTIES OF CYCLOIDAL GEARS

作　　者：谭志雨 高博 李建辉[1] 安慧 魏慧君[1] 魏强 Tan Zhiyu;Gao Bo;Li Jianhui;An Hui;Wei Huijun;Wei Qiang(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei;School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401)

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018 [2]河北工业大学机械工程学院,天津300401

出　　处：《河北冶金》2024年第5期50-55,共6页Hebei Metallurgy

基　　金：河北省重点研发计划(20311802D),河北科技大学创新创业训练计划项目(202210082014)。

摘　　要：以20CrMoH钢作为RV减速器摆线轮的原料,经调质和等温正火两种工艺预处理后,在渗碳温度880℃,渗碳压力1500 Pa,保压时间25 s,渗扩比1∶5,渗碳时间分别为45 min和65 min工艺下进行低压真空渗碳热处理,利用直读光谱仪、光学显微镜、洛氏硬度计、显微维氏硬度计、激光三坐标仪器及Geomagic Qualify软件等分析方法对热处理后样品的碳含量、微观组织、表层硬度、渗层深度和变形量进行了研究。结果发现,两种预处理的摆线轮在渗碳后表层到心部的组织基本一致,表面碳含量保持一致,表层洛氏硬度相差0.1 HRC,渗层深度相差0.007 mm,变形量也基本一致,表明这两种不同的预处理工艺对渗碳摆线轮组织、力学性能及变形量的影响较小;当渗碳时间从45 min延长到65 min时,摆线轮组织更加均匀,表面碳含量增加了0.05%,表层洛氏硬度提高了0.3 HRC,渗层深度增加了0.2 mm左右,变形量有所减小,表明延长渗碳时间会增加摆线轮的表层碳浓度、表层硬度及渗层深度,同时使摆线轮的组织更均匀,变形量更小。Using 20CrMoH steel as the raw material for the RV reducer cycloidal wheel,after two pre-treatment processes of quenching and isothermal normalization,the carbon content,microstructure,surface hardness,infiltration depth,and deformation of the heat-treated samples were studied using analysis methods such as direct reading spectrometer,optical microscope,Rockwell hardness tester,micro Vickers hardness tester,laser coordinate instrument,and Geomagic Quantify software under the carburizing temperature of 880℃,carburizing pressure of 1500 Pa,holding time of 25 s,diffusion ratio of 1∶5,and carburizing time of 45 min and 65 min,respectively.The results showed that the microstructure of the two pre-treatment cycloidal gears from the surface to the center after carburization was basically the same,with the same surface carbon content.The difference in Rockwell hardness between the surface and the depth of the carburization layer was 0.1 HRC and 0.007 mm,and the deformation was also basically the same.This indicates that these two different pre-treatment processes have a relatively small impact on the microstructure,mechanical properties,and deformation of the carburized cycloidal gears;When the carburization time was extended from 45 minutes to 65 minutes,the microstructure of the cycloidal wheel became more uniform,with a surface carbon content increase of 0.05%,a surface Rockwell hardness increase of 0.3 HRC,an increase in carburization depth of about 0.2 mm,and a decrease in deformation.This indicates that extending the carburization time will increase the surface carbon concentration,surface hardness,and carburization depth of the cycloidal wheel,while also making the microstructure more uniform and reducing the deformation.

关 键 词：摆线轮 真空渗碳 热处理 微观表征 碳含量 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]