转向节锻件枝丫结构淬火裂纹形成机理

doi:10.13251/j.issn.0254-6051.2022.04.045

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 263-267.DOI: 10.13251/j.issn.0254-6051.2022.04.045

转向节锻件枝丫结构淬火裂纹形成机理

杨杰¹, 汪西², 周杰², 武建祥¹, 屈志远², 代合平¹, 彭海军³

1.湖北三环锻造有限公司, 湖北襄阳 441700;
2.重庆大学材料科学与工程学院, 重庆 400044;
3.重庆杰品科技股份有限公司, 重庆 401329

收稿日期:2021-12-27 修回日期:2022-01-29 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 彭海军,硕士,E-mail:1342550938@qq.com
作者简介:杨杰(1976—),男,工程师,主要研究方向为转向节锻造及热处理,E-mail:43255369@qq.com。
基金资助:
国家自然科学基金(52075058)

Formation mechanism of quenching cracks in branch-shaped structure of steering knuckle forgings

Yang Jie¹, Wang Xi², Zhou Jie², Wu Jianxiang¹, Qu Zhiyuan², Dai Heping¹, Peng Haijun³

1. Hubei Tri-Ring Forging Co., Ltd., Xiangyang Hubei 441700, China;
2. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
3. Chongqing Jiepin Technology Co., Ltd., Chongqing 401329, China

Received:2021-12-27 Revised:2022-01-29 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 通过对42CrMo钢转向节锻件宏观结构分析和裂纹区域微观组织分析,结合锻造、淬火工艺的数值模拟,研究了淬火裂纹产生的原因。结果表明,转向节形状复杂,截面变化剧烈,淬火时易在单枝与高耳结合部位产生应力集中,且该处的结构尺寸处于危险敏感尺寸范围内,导致更容易形成横向裂纹。同时金属流线方向与单枝长度方向平行并存在沿金属流线方向的夹杂,导致纵向力学性能低,易产生纵向裂纹。

关键词: 42CrMo钢, 转向节, 淬火裂纹, 金属流线, 数值模拟

Abstract: Cause of quenching cracks of the 42CrMo steering knuckle forging was studied by analyzing microstructure of the the forging shape and crack area, and combined with the numerical simulation of the quenching and forging stages. The results show that the shape of the steering knuckle is complex, and the cross-section changes drastically, so it is easy to produce stress concentration during quenching at the connection between the fork and the flange during quenching, and the fillet size at this place is within the dangerous size range, resulting in easier to form transverse cracks. In addition, the direction of the metal streamline is parallel to the length direction of the single branch, and there are inclusions along the direction of the metal streamline, resulting in low longitudinal mechanical properties and prone to longitudinal cracks.

Key words: 42CrMo steel, steering knuckle, quenching crack, metal streamline, numerical simulation

中图分类号:

TG157

杨杰, 汪西, 周杰, 武建祥, 屈志远, 代合平, 彭海军. 转向节锻件枝丫结构淬火裂纹形成机理[J]. 金属热处理, 2022, 47(4): 263-267.

Yang Jie, Wang Xi, Zhou Jie, Wu Jianxiang, Qu Zhiyuan, Dai Heping, Peng Haijun. Formation mechanism of quenching cracks in branch-shaped structure of steering knuckle forgings[J]. Heat Treatment of Metals, 2022, 47(4): 263-267.

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转向节锻件枝丫结构淬火裂纹形成机理

Formation mechanism of quenching cracks in branch-shaped structure of steering knuckle forgings

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