18CrNiMo7-6钢齿轮轴开裂失效分析

doi:10.13251/j.issn.0254-6051.2024.02.046

金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 297-300.DOI: 10.13251/j.issn.0254-6051.2024.02.046

18CrNiMo7-6钢齿轮轴开裂失效分析

张兵^1,2,3, 毛艺蒙^1,2,3, 姜涛^1,2,3, 刘鑫⁴

1.中国航发北京航空材料研究院, 北京 100095;
2.航空材料检测与评价北京市重点实验室, 北京 100095;
3.中国航空发动机集团材料检测与评价重点实验室, 北京 100095;
4.中信科信(北京)投资咨询有限公司, 北京 102407

收稿日期:2023-08-16 修回日期:2024-01-04 出版日期:2024-03-27 发布日期:2024-03-27
作者简介:张兵(1978—),男,高级工程师,博士,主要研究方向为材料和结构的损伤、失效分析等,E-mail:zhbenglish@126.com
基金资助:
中国航发自主创新基金(ZZCX-2022-027)

Cracking failure analysis of 18CrNiMo7-6 steel gear shaft

Zhang Bing^1,2,3,4, Mao Yimeng^1,2,3,4, Jiang Tao^1,2,3,4, Liu Xin⁴

1. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China;
3. AECC Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China;
4. Zhongxin Kexin (Beijing) Invest Consulting Co., Ltd., Beijing 102407, China

Received:2023-08-16 Revised:2024-01-04 Online:2024-03-27 Published:2024-03-27

摘要/Abstract

摘要： 某齿轮轴渗碳+淬火+回火热处理后在静置期间发生开裂。为了明确齿轮轴的失效性质和原因,对断口进行了宏、微观形貌观察和能谱成分分析,对断口附近材料微观组织进行了检查,并且测试了材料的硬度和氢含量。结果表明,齿轮轴开裂性质为氢致延迟脆性开裂。裂纹从齿轮轴内部起源,源区存在大尺度条状非金属夹杂,导致较大应力集中,是其发生氢脆开裂的主要原因。因此,应严格控制齿轮轴的材质。此外,可以采用无损检测方法对齿轮轴内部的大尺度非金属夹杂进行检测,以防止同类故障的发生。

关键词: 齿轮轴, 18CrNiMo7-6钢, 氢脆, 非金属夹杂

Abstract: A gear shaft cracked during static standing after carburizing, quenching and tempering. In order to find out the failure mechanism of the gear shaft, macro and micro morphologies were observed and local chemical composition of the fracture surface was analyzed. In addition, the microstructure of the shaft near the fracture was examined, and the hardness and hydrogen content were tested. The results show that the failure mode of the gear shaft is delayed brittle cracking induced by hydrogen embrittlement. The crack initiated from the inside of the shaft and there is a large-size nonmetallic inclusion at the source zone, leading to greater stress concentration, which is the main cause for the hydrogen embrittlement cracking. Therefore, the material quality of the gear shafts should be strictly controlled, and nondestructive detection should be carried out to detect the large-size nonmetallic inclusions in the gear shafts so to prevent such failure.

Key words: gear shaft, 18CrNiMo7-6 steel, hydrogen embrittlement, nonmetallic inclusion

中图分类号:

TGl57

张兵, 毛艺蒙, 姜涛, 刘鑫. 18CrNiMo7-6钢齿轮轴开裂失效分析[J]. 金属热处理, 2024, 49(2): 297-300.

Zhang Bing, Mao Yimeng, Jiang Tao, Liu Xin. Cracking failure analysis of 18CrNiMo7-6 steel gear shaft[J]. Heat Treatment of Metals, 2024, 49(2): 297-300.

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18CrNiMo7-6钢齿轮轴开裂失效分析

Cracking failure analysis of 18CrNiMo7-6 steel gear shaft

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