1500 MPa级热成形钢的组织与性能

doi:10.13251/j.issn.0254-6051.2025.06.008

金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 47-53.DOI: 10.13251/j.issn.0254-6051.2025.06.008

1500 MPa级热成形钢的组织与性能

李伟男¹, 喻建林², 赵棪¹, 唐小勇², 刘涛², 赵征志¹

1.北京科技大学钢铁共性技术协同创新中心, 北京 100083;
2.新余钢铁集团有限公司技术中心, 江西新余 338001

收稿日期:2024-12-07 修回日期:2025-03-19 出版日期:2025-06-25 发布日期:2025-07-08
通讯作者: 赵征志,研究员,博士生导师,E-mail: zhaozhzhi@ustb.edu.cn
作者简介:李伟男(2000—),男,硕士研究生,主要研究方向为高强度热成形钢开发,E-mail: M202221342@xs.ustb.edu.cn。
基金资助:
江西省赣鄱俊才支持计划(20232BCJ22030)

Microstructure and properties of 1500 MPa hot stamped steel

Li Weinan¹, Yu Jianlin², Zhao Yan¹, Tang Xiaoyong², Liu Tao², Zhao Zhengzhi¹

1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;
2. Technical Center, Xinyu Iron and Steel Group Co., Ltd., Xinyu Jiangxi 338001, China

Received:2024-12-07 Revised:2025-03-19 Online:2025-06-25 Published:2025-07-08

摘要/Abstract

摘要： 基于传统热成形钢实验室研究及工业化生产,开发了一种强度和塑性相互兼容的1500 MPa级热成形钢。结果表明,试验钢冷轧板在680 ℃×14 h罩式炉退火后的屈服强度为369 MPa,抗拉强度为482 MPa,断裂总延伸率为25.0%,满足1500 MPa级热成形钢退火板性能标准要求。退火板经模拟热成形工艺后的显微组织为完全马氏体组织,试验钢的屈服强度范围为1250~1330 MPa,抗拉强度为1600~1650 MPa,断裂总延伸率为7.5%~8.5%,综合力学性能优异。在奥氏体化温度为910、930、950 ℃条件下的模拟热成形试验中,试验钢淬火后的马氏体板条块尺寸随奥氏体化温度升高而增加,几何必需位错密度降低,KAM值减小,奥氏体化温度为910 ℃时试验钢的屈服强度最高,位错强化效果显著。

关键词: 热成形钢, 淬火, 马氏体, 位错强化

Abstract: Based on the laboratory research and industrial production of traditional hot stamped steel, a 1500 MPa grade hot stamped steel with a good balance between strength and plasticity is developed. The results show that for the cold-rolled sheet of the tested steel, after batch annealing at 680 ℃ for 14 h, the yield strength is 369 MPa, the tensile strength is 482 MPa, and the total extension at fracture is 25.0%, meeting the performance standard requirements of the annealed sheet of the 1500 MPa grade hot stamped steel. The microstructure of the annealed sheet after the simulated hot stamping process is a complete martensite structure. The yield strength of the tested steel ranges from 1250 to 1330 MPa, the tensile strength is 1600-1650 MPa, and the total extension at fracture is 7.5%-8.5%, showing excellent comprehensive mechanical properties. In the simulated quenching tests under the austenitizing temperatures of 910 ℃, 930 ℃, and 950 ℃, the martensite block size of the quenched tested steel increases with the increase of austenitizing temperature, the geometrically necessary dislocation density decreases, and the KAM value decreases. When the austenitizing temperature is 910 ℃, the tested steel has the highest yield strength, and dislocation strengthening is effective.

Key words: hot stamped steel, quenching, martensite, dislocation strengthening

中图分类号:

TG161

李伟男, 喻建林, 赵棪, 唐小勇, 刘涛, 赵征志. 1500 MPa级热成形钢的组织与性能[J]. 金属热处理, 2025, 50(6): 47-53.

Li Weinan, Yu Jianlin, Zhao Yan, Tang Xiaoyong, Liu Tao, Zhao Zhengzhi. Microstructure and properties of 1500 MPa hot stamped steel[J]. Heat Treatment of Metals, 2025, 50(6): 47-53.

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1500 MPa级热成形钢的组织与性能

Microstructure and properties of 1500 MPa hot stamped steel

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