| 20Cr2Ni4钢齿轮渗碳淬火及装配后开裂原因分析 |
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| 引用本文： | 许鸿翔,王红伟,张衡,汪军,赵少甫.20Cr2Ni4钢齿轮渗碳淬火及装配后开裂原因分析[J].金属热处理,2021,46(8):250-253. |
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| 作者姓名： | 许鸿翔 王红伟 张衡 汪军 赵少甫 |
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| 作者单位： | 郑州机械研究所有限公司, 河南 郑州 450001 |
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| 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。
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| 关 键 词： | 齿轮 20Cr2Ni4钢 渗碳淬火 减重孔 粗刀痕 裂纹源 |
| 收稿时间： | 2021-04-09 |
Crack analysis of case-hardened 20 Cr2 Ni4 steel gear after assembly |
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| Xu Hongxiang,Wang Hongwei,Zhang Heng,Wang Jun,Zhao Shaofu.Crack analysis of case-hardened 20 Cr2 Ni4 steel gear after assembly[J].Heat Treatment of Metals,2021,46(8):250-253. |
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| Authors: | Xu Hongxiang Wang Hongwei Zhang Heng Wang Jun Zhao Shaofu |
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| Affiliation: | Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou Henan 450001, China |
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| 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. |
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| Keywords: | gear 20Cr2Ni4 steel carburizing and quenching weight-reducing hole rough tool mark crack source |
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