800 MPa级热基镀锌复相钢的开发

doi:10.13251/j.issn.0254-6051.2022.02.012

金属热处理 ›› 2022, Vol. 47 ›› Issue (2): 65-69.DOI: 10.13251/j.issn.0254-6051.2022.02.012

800 MPa级热基镀锌复相钢的开发

邹英¹, 刘华赛¹, 韩赟², 王朝斌³, 王海全²

1.首钢技术研究院京唐技术中心, 北京 100043;
2.首钢技术研究院薄板研究所, 北京 100043;
3.首钢京唐钢铁联合有限责任公司制造部, 河北唐山 063210

收稿日期:2021-10-08 修回日期:2021-12-18 出版日期:2022-02-25 发布日期:2022-04-01
作者简介:邹英(1989—),男,工程师,博士,主要研究方向为汽车用先进高强钢,E-mail:zouy1954@shougang.com.cn
基金资助:
河北省重点研发计划(20311004D)

Development of 800 MPa grade hot-rolled galvanized complex phase steel

Zou Ying¹, Liu Huasai¹, Han Yun², Wang Chaobin³, Wang Haiquan²

1. Jingtang Technology Center, Shougang Research Institute of Technology, Beijing 100043, China;
2. Sheet Metal Research Institute, Shougang Research Institute of Technology, Beijing 100043, China;
3. Manufacturing Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan Hebei 063210, China

Received:2021-10-08 Revised:2021-12-18 Online:2022-02-25 Published:2022-04-01

摘要/Abstract

摘要： 设计了一种Nb、Ti微合金化低碳复相钢,采用SEM、TEM及力学性能测试等方法研究了退火镀锌过程中热轧复相钢显微组织、析出相和力学性能的演变规律,进行了800 MPa级热基镀锌复相钢工业试制。结果表明,热轧复相钢的显微组织主要由铁素体、马氏体和马/奥岛构成。退火镀锌过程中,马氏体和马/奥岛分解形成高温回火马氏体,铁素体内可动位错密度降低,同时析出纳米级Nb、Ti和Mo的复合碳化物,导致抗拉强度降低、屈服强度和扩孔率显著提高。热基镀锌复相钢的显微组织主要由铁素体和高温回火马氏体构成,屈服强度、抗拉强度、断后伸长率和烘烤硬化值分别为769 MPa、852 MPa、14.5%和43 MPa,扩孔率达到53%,具有良好的力学性能和局部成形性能。

关键词: 热基镀锌, 复相钢, 显微组织, 力学性能, 扩孔率

Abstract: A Nb and Ti microalloyed low-carbon complex phase steel was designed, and the evolution of microstructure, precipitates and mechanical properties of the hot-rolled complex phase steel during annealing and galvanizing was studied by means of SEM, TEM, mechanical properties test. Moreover, the industrial trial production of 800 MPa hot-rolled galvanized complex phase steel was carried out. The results show that, the microstructure of the hot-rolled complex phase steel is mainly composed of ferrite, martensite and M/A island. During annealing and galvanizing, the martensite and M/A island are decomposed to form high-temperature tempered martensite, and the density of glissile dislocation in ferrite is decreased, and the nano-scale composite carbides of Nb, Ti and Mo are precipitated at the same time, resulting in a decrease of tensile strength, a significant increase of yield strength and hole expansion ratio. The microstructure of the hot-rolled galvanized complex phase steel is mainly composed of ferrite and high-temperature tempered martensite. The yield strength, tensile strength, elongation after fracture and bake hardening value are 769 MPa, 852 MPa, 14.5% and 43 MPa, respectively, and the hole expansion ratio reaches 53%, indicating excellent mechanical properties and local formability.

Key words: hot-rolled galvanizing, complex phase steel, microstructure, mechanical properties, hole expansion ratio

中图分类号:

TG142.1

邹英, 刘华赛, 韩赟, 王朝斌, 王海全. 800 MPa级热基镀锌复相钢的开发[J]. 金属热处理, 2022, 47(2): 65-69.

Zou Ying, Liu Huasai, Han Yun, Wang Chaobin, Wang Haiquan. Development of 800 MPa grade hot-rolled galvanized complex phase steel[J]. Heat Treatment of Metals, 2022, 47(2): 65-69.

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800 MPa级热基镀锌复相钢的开发

Development of 800 MPa grade hot-rolled galvanized complex phase steel

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