G80Cr4Mo4V钢轴承套圈离子渗氮工艺优化试验  

Test on Ion Nitriding Process Optimization for Bearing Rings Made of G80Cr4Mo4V Steel

作　　者：刘金玲 于遨海 索志鹏 韩松 黄丽 LIU Jinling;YU Aohai;SUO Zhipeng;HAN Song;HUANG Li(AECC Harbin Bearing Co.,Ltd.,Harbin 150025,China)

机构地区：[1]中国航发哈尔滨轴承有限公司,哈尔滨150025

出　　处：《轴承》2021年第5期31-34,共4页Bearing

摘　　要：采用不同的离子渗氮工艺对G80Cr4Mo4V钢轴承套圈进行离子渗氮处理。采用金相显微镜、硬度计分析渗氮层组织、硬度以及渗氮层深度,借助X射线衍射仪对优化工艺处理的轴承套圈进行应力梯度对比分析。结果表明:降低溅射时间或延长脉冲停顿时间可以改善脉状组织级别;渗氮时间由30 h增至50 h后,渗氮层深度及硬度得到显著提高,继续增至75 h,渗氮层深度及硬度变化不再显著;氮氢比为1∶25,脉冲比为1∶6工艺条件下,G80Cr4Mo4V钢外圈在渗氮温度515℃、渗氮时间50 h、脉冲时间70μs、溅射时间3 h时性能最优。Ion nitriding treatment of bearing rings made of G80Cr4Mo4V steel is carried out by using different ion nitriding processes.The microstructure,hardness and depth of nitriding layer are analyzed by metallographic microscope and hardness tester,and the stress gradient of bearing rings treated with optimized process is comparatively analyzed by X-ray diffractometer.The results show that the decreasing sputtering time or prolonging pulse pause time can improve the level of vein structure;the depth and hardness of nitriding layer are increased significantly when the nitriding time increases from 30 h to 50 h;the changes of depth and hardness of nitriding layer are no longer significant when the nitriding time increases to 75 h.Under the conditions of nitrogen-hydrogen ratio of 1∶25 and pulse ratio of 1∶6,the outer ring made of G80Cr4Mo4V steel has best performance under nitriding temperature of 515℃,nitriding time of 50 h,pulse time of 70μs and sputtering time of 3 h.

关 键 词：滚动轴承 高温轴承钢 套圈 离子渗氮 硬度 残余应力 

分 类 号：TH133.33[机械工程—机械制造及自动化] TG156.82[金属学及工艺—热处理]