高速中间轴齿轮开裂失效分析  

Cracking failure analysis on high-speed intermediate shaft gear

作　　者：陈生超 陈业生 戎泽玉 王红伟 许鸿翔 赵少甫 郭敬强 Chen Shengchao;Chen Yesheng;Rong Zeyu;Wang Hongwei;Xu Hongxiang;Zhao Shaofu;Guo Jingqiang(Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou Henan 450001,China;Zhengzhou University,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]郑州大学,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7期287-291,共5页Heat Treatment of Metals

摘　　要：某齿轮箱中的18CrNiMo7-6钢高速中间轴齿轮在渗碳淬火磨齿后做动平衡试验过程中出现振动异响,拆机后发现中间轴齿轮在轴径处出现明显的轴向裂纹。通过宏观观察、多次切割后找到裂纹源位于大轴齿轮心部,在裂纹源处取样进行化学成分、显微组织分析等方法对开裂位置进行研究。结果表明,由于大型齿坯锻件去氢处理不完全,随着时间的推移,氢原子聚集形成氢分子,在工件内部造成应力集中,导致该轴齿轮在渗碳淬火磨齿后发生延迟性氢脆开裂,引起轴齿轮失效。A 18CrNiMo7-6 steel high speed intermediate shaft gear of gearbox had abnormal vibration sound during the dynamic balance test after carburizing and quenching.After disassembly,it was found that the intermediate shaft gear had obvious axial crack at the axial diameter.After macro observation and multiple cutting,it was found that the crack source was located at the axle center of the large gear.The crack location of the main shaft was studied by chemical composition analysis and microstructure analysis.The results show that due to the incomplete dehydrogenation treatment of the large billet forgings,the hydrogen atoms gather to form hydrogen molecules over time,which causes the stress concentration inside the workpiece,leading to the delayed hydrogen embrittlement cracking of the gear shaft after carburizing and quenching,and resulting in the failure of the shaft gear.

关 键 词：高速轴齿轮 18CrNiMo7-6钢 开裂 氢脆 失效分析 

分 类 号：TH133.2[机械工程—机械制造及自动化] TG162.73[金属学及工艺—热处理]