轴承套圈碳氮共渗工艺的改进  

Improvement of carbonitriding process for bearing rings

作　　者：周瑞虎 樊启刚 曾志鹏 Zhou Ruihu;Fan Qigang;Zeng Zhipeng(Xiangyang Key Laboratory of Intelligent Manufacturing and Machine Vision,School of Mechanical Engineering,Hubei University of Arts and Science,Xiangyang Hubei 441053,China;Xiang Yang Automobile Bearing Co.,Ltd.,Xiangyang Hubei 441004,China)

机构地区：[1]湖北文理学院机械工程学院智能制造与机器视觉襄阳市重点实验室,湖北襄阳441053 [2]襄阳汽车轴承股份有限公司,湖北襄阳441004

出　　处：《金属热处理》2024年第8期152-155,共4页Heat Treatment of Metals

基　　金：2023年湖北省科技创新计划重点研发项目(2023ABA132)。

摘　　要：针对常规碳氮共渗处理后高碳铬轴承表面组织粗大和废品率高的问题,对现有工艺进行改进。在原有碳氮共渗+淬火回火工艺基础上,在碳氮共渗后增加了空冷环节。结果表明,改进后工艺有效解决了渗层深度和组织级别的矛盾,改善了马氏体组织级别。对比常规碳氮共渗工艺,经改进后工艺处理得到的轴承内圈尺寸畸变量小,表面组织和硬度能够满足要求,疲劳寿命达到5.5L10。To address the issues of coarse surface structure and high scrap rate of high carbon chromium bearings after conventional carbonitriding treatment,improvements were made to the existing process.On the basis of the original carbonitriding+quenching and tempering process,an air cooling process was added after carbonitriding.The results show that the improved process effectively resolves the contradiction between the depth of infiltration layer and the level of microstructure,and improves the level of the martensite.Compared with the conventional carbonitriding process,the improved process results in smaller size distortion of the bearing inner ring,satisfactory surface microstructure and hardness,and the fatigue life of 5.5L10.

关 键 词：轴承套圈 碳氮共渗 工艺改进 微观组织 

分 类 号：TH133.3[机械工程—机械制造及自动化] TG156.8[金属学及工艺—热处理]