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

doi:10.13251/j.issn.0254-6051.2022.04.045

Abstract

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

CLC Number:

TG157

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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