42CrMo钢低速轴止推环调质开裂失效分析  

Failure analysis on quenching and tempering cracking of 42CrMo steel low-speed shaft thrust ring

作　　者：李子岩 许鸿翔 陈业生 刘志强 郭敬强 陈岩 赵少甫 Li Ziyan;Xu Hongxiang;Chen Yesheng;Liu Zhiqiang;Guo Jingqiang;Chen Yan;Zhao Shaofu(Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou Henan 450001,China;ZRIME Gearing Technology Co.,Ltd.,Zhengzhou Henan 450001,China;Beijing Petroleum Machinery Co.,Ltd.,Beijing 102200,China)

机构地区：[1]郑州机械研究所有限公司,河南郑州450001 [2]郑机所(郑州)传动科技有限公司,河南郑州450001 [3]北京石油机械有限公司,北京102200

出　　处：《金属热处理》2023年第9期283-287,共5页Heat Treatment of Metals

基　　金：大型掘进机行星齿轮减速器精密制造与试验(2020YFB2007003)。

摘　　要：42CrMo钢低速轴止推环调质处理后产生端面裂纹而失效。对断裂部位的化学成分、硬度梯度及显微组织观察检测,并利用SEM和EDS对断口中的夹杂物进行观察和微区分析。结果表明,由于原材料组织夹杂物、工件表面存在粗刀痕、低速轴零件结构设计不合理等多重因素导致淬火过程开裂。通过优化机加工粗车工序、淬火辅助工装及控制原材料组织等措施可降低止推环处淬火开裂风险。42CrMo steel low-speed shaft thrust ring failed due to end face cracks after quenching and tempering treatment.The chemical composition,hardness gradient and microstructure of the fracture position were observed and detected,and the inclusions in the fracture were observed and analyzed by means of SEM and EDS.The results show that the cracks are caused by many factors,such as the inclusion in raw materials,the existence of rough tool marks on the workpiece surface,and the unreasonable structural design of the low-speed shaft part.The risk of quenching cracking at the thrust ring can be reduced by optimizing the rough turning process of machining,quenching auxiliary tooling and controlling the microstructure of raw materials.

关 键 词：42CRMO钢 显微组织 失效分析 开裂 

分 类 号：TG156.6[金属学及工艺—热处理]