Transactions of Materials and Heat Treatment

Title：High-temperature gas bulging process of anti-oxidant and coating-free hot forming steel torsion beam

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ClassificationCode：TG306

year,vol(issue):pagenumber：2025,50(8):113-122

Abstract：

In order to solve the application pain points that the traditional torsion beam components of 22MnB5 steel had stringent requirements on die cooling capacity during the gas bulging hot forming process, and the material had poor resistance to high-temperature oxidation, which made it difficult to remove the oxide scale on the inner wall of pipe after gas bulging, two process schemes were applied for the torsion beam sample trial manufacturing asing the anti-oxidation and coating-free hot-formed steel of Bensteel Group Co., Ltd. The result analysis shows that the cross-sectional shape and dimensional accuracy of the samples produced by the preforming + gas bulging shaping process are relatively high, the microstructure of the torsion beam samples can be completely martensitic, and the tensile yield strength and tensile strength of the samples reach more than 1300 and 1700 MPa respectively, with the elongation exceeding 7%. In addition, the thickness of Cr- and Si-rich oxide layer on the surface of the finished product is less than 1 μm, and the adhesion is excellent.

Funds：

国家自然科学基金资助项目（52275319）；山东省重大科技创新工程项目（2021SFGC0902）

作者简介：王飞（1981-），男，硕士，高级工程师 E-mail：ekin55@126.com 通信作者：姚圣杰（1982-），男，博士，教授 E-mail：shj_yao@163.com

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