| 发动机轴承内环裂纹原因分析 |
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| 引用本文： | 吉晓乐,刘丽玉,卢文海,刘昌标.发动机轴承内环裂纹原因分析[J].失效分析与预防,2018,13(3):177-181. |
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| 作者姓名： | 吉晓乐 刘丽玉 卢文海 刘昌标 |
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| 作者单位： | 1. 中国航发常州兰翔机械有限责任公司, 江苏 常州 213000; |
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| 摘 要： | 发动机装机磨合试车3 h后分解检查，发现一型轴承内环端面上有一条裂纹。通过对轴承内环端面裂纹进行宏微观观察、断口微观分析、裂纹处组织及硬度检测，确定裂纹的开裂原因。结果表明，轴承内环端面裂纹是由于原材料存在缩孔残余缺陷，在锻造过程中被压扁呈一条闭合的线性氧化物夹杂带，在后续的磨合试车过程中开裂。原材料的缩孔缺陷为铸锭中近冒口的缩孔残余或二次缩孔，其在原材料中的分布较集中，通过低倍检验可以发现这一缺陷。后期在钢材出厂检测环节增加了低倍检验后，成品零件未再出现此类缺陷。
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| 关 键 词： | 轴承 裂纹 断口 缩孔残余 铸锭 |
| 收稿时间： | 2018-03-10 |
Cracking Analysis of Inner Ring of Bearing in Engine |
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| JI Xiao-yue,LIU Li-yu,LU Wen-hai,LIU Chang-biao.Cracking Analysis of Inner Ring of Bearing in Engine[J].Failure Analysis and Prevention,2018,13(3):177-181. |
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| Authors: | JI Xiao-yue LIU Li-yu LU Wen-hai LIU Chang-biao |
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| Abstract: | There was a visually visible crack found on the end of the inner ring of a bearing in an engine after 3 hours’ test. Macroscopic and microscopic observation, microstructure examination and hardness testing were carried out to analyze the cause of the crack. The results show that the crack was due to the shrinkage residual defects in the raw material, which were flattened into a closed linear oxide inclusion in the process of forging, and then cracked in the following testing. The shrinkage residual defects in the raw material should be the shrinkage residual or the secondary shrinkage nearing the feeder head of the cast ingot. The distribution of the shrinkage residual is concentrative in the raw material, so they can be found by the macroscopic examination. In the later stage, macroscopic examination was added before they came into market, and the finished parts had no such defects. |
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