| 50CrV4钢垫圈开裂原因分析 |
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| 引用本文： | 吉国强,葛贵明,于丽娟,钟继志. 50CrV4钢垫圈开裂原因分析[J]. 金属热处理, 2021, 46(7): 254-257. DOI: 10.13251/j.issn.0254-6051.2021.07.049 |
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| 作者姓名： | 吉国强 葛贵明 于丽娟 钟继志 |
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| 作者单位： | 广东省科学院测试分析研究所(中国广州分析测试中心),广东 广州 510070;韶关市中广测协同创新技术有限公司,广东 韶关 512026 |
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| 摘 要： | 采用扫描电镜、能谱分析仪、光学显微镜和火花直读光谱仪等设备,观察和检测了50CrV4钢垫圈失效件的断口形貌、显微组织及化学成分等。检测结果表明,由于垫圈原材料存在成分偏析,碳化物在晶界处偏聚,造成局部应力集中。淬火冷却时,在应力作用下垫圈产生沿晶裂纹,后续使用过程中,裂纹在外力作用下进一步扩展,提前失效。
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| 关 键 词： | 50CrV4钢 弹簧钢 成分偏析 脆性断裂 沿晶裂纹 |
| 收稿时间： | 2021-04-12 |
Analysis on cracking of 50 CrV4 steel washer |
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| Ji Guoqiang,Ge Guiming,Yu Lijuan,Zhong Jizhi. Analysis on cracking of 50 CrV4 steel washer[J]. Heat Treatment of Metals, 2021, 46(7): 254-257. DOI: 10.13251/j.issn.0254-6051.2021.07.049 |
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| Authors: | Ji Guoqiang Ge Guiming Yu Lijuan Zhong Jizhi |
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| Affiliation: | 1. Institute of Analysis, Guangdong Academy of Sciences China National Analytical Center, Guangzhou, Guangzhou Guangdong 510070, China; 2. Shaoguan NACC Collaborative Innovation Technology Co., Ltd., Shaoguan Guangdong 512026, China |
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| Abstract: | Appearance of fracture, metallurgical structure and chemical composition of the failed 50CrV4 washer were observed or tested by means of SEM, EDS, OM and spark direct reading spectrometer, respectively.The test results show that carbide segregation occurred due to the chemical composition segregation of washer raw materials causes local stress concentration. During quenching and cooling, intergranular cracks appear in the washer under the stress. During subsequent use, the cracks further expand under the action of external force and lead to the earlier failure. |
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| Keywords: | 50CrV4 steel spring steel chemical composition segregation brittle fracture intergranular crack |
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