金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 250-253.DOI: 10.13251/j.issn.0254-6051.2021.08.048

• 测试与分析 • 上一篇    

20Cr2Ni4钢齿轮渗碳淬火及装配后开裂原因分析

许鸿翔, 王红伟, 张衡, 汪军, 赵少甫   

  1. 郑州机械研究所有限公司, 河南 郑州 450001
  • 收稿日期:2021-04-09 出版日期:2021-08-25 发布日期:2021-12-09
  • 通讯作者: 王红伟,高级工程师,E-mail:whw91@sina.com
  • 作者简介:许鸿翔(1979—),男,高级工程师,主要研究方向为金属材料及热处理工艺,E-mail:13838005005@163.com。

Crack analysis of case-hardened 20Cr2Ni4 steel gear after assembly

Xu Hongxiang, Wang Hongwei, Zhang Heng, Wang Jun, Zhao Shaofu   

  1. Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou Henan 450001, China
  • Received:2021-04-09 Online:2021-08-25 Published:2021-12-09

摘要: 采用光学显微镜、显微硬度计和光谱分析仪等测试方法,对20Cr2Ni4钢齿轮渗碳淬火及装配后开裂的原因进行分析。结果表明,该渗碳淬火齿轮齿顶硬度和硬化层深度均满足要求,显微组织良好。轮辐减重孔处为裂纹源,减重孔内壁明显的粗刀痕形成的应力集中导致齿轮与轴系装配后裂纹逐步扩展到齿轮内孔,进而导致开裂失效,并据此提出了改进措施。

关键词: 齿轮, 20Cr2Ni4钢, 渗碳淬火, 减重孔, 粗刀痕, 裂纹源

Abstract: Failure reason of the case-hardened 20Cr2Ni4 steel gear after assembly was analyzed by means of OM, micro-hardness tester and spectrometer. The results show that the tooth top hardness and hardened case depth of the carburized and hardened gear all meet the requirements and the microstructure is good. The cracks source is at the weight-reducing hole of spoke, and the rough tool marks obviously formed in the inner wall of weight-reducing hole can lead to the stress concentration, resulting in the cracks of gear and axle after assembly expanding to the inner hole of gear gradually. And then the fracture failure is occurred, finally some improvement measures are put forward.

Key words: gear, 20Cr2Ni4 steel, carburizing and quenching, weight-reducing hole, rough tool mark, crack source

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