低成本800 MPa级镀锌超高强度双相钢的微观组织与性能

doi:10.13251/j.issn.0254-6051.2021.08.015

金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 73-76.DOI: 10.13251/j.issn.0254-6051.2021.08.015

低成本800 MPa级镀锌超高强度双相钢的微观组织与性能

刘靖宝, 田秀刚, 张杰, 魏焕君, 杨丽娜, 王朝, 李孟星

河钢集团唐钢公司技术中心, 河北唐山 063001

收稿日期:2021-03-30 出版日期:2021-08-25 发布日期:2021-12-09
作者简介:刘靖宝(1983—),男,博士研究生,主要研究方向为汽车、家电板研发与生产,E-mail:liu_jing_bao@163.com
基金资助:
唐山市技术创新团队项目(19130205d)

Microstructure and properties of a low-cost 800 MPa galvanized ultra-high strength dual-phase steel

Liu Jingbao, Tian Xiugang, Zhang Jie, Wei Huanjun, Yang Lina, Wang Zhao, Li Mengxing

Technical Center, Hesteel Group Tangsteel Company, Tangshan Hebei 063001, China

Received:2021-03-30 Online:2021-08-25 Published:2021-12-09

摘要/Abstract

摘要： 利用光学显微镜、透射电镜(TEM)对800 MPa级双相钢热轧、冷轧及热镀锌后的显微组织进行了观察,分析比较了热镀锌后整卷通板宽不同位置的力学性能。结果表明:试验钢经795 ℃保温150 s后热涂镀,微观组织以铁素体+马氏体为主,铁素体晶粒尺寸在2.3～6.0 μm之间,马氏体体积分数为21％左右。热镀锌后抗拉强度为825 MPa,屈服强度为505 MPa,断后伸长率为19%,沿板宽方向力学性能稳定性较好,抗拉强度波动在20 MPa以内,屈服强度波动在4 MPa以内,断后伸长率波动1%。对热镀锌后整卷钢头中尾部进行了折弯性能评价,以3倍厚度弯心直径进行横向180°折弯试验,结果都没有开裂,能够满足用户对高折弯性能的要求。

关键词: 超高强度双相钢, 热镀锌, 显微组织, 马氏体含量, 折弯性能

Abstract: Microstructure of hot-rolled, cold-rolled and hot-dip galvanized 800 MPa grade dual-phase steel was observed by means of optical microscope and transmission electron microscope (TEM). The mechanical properties at different positions of the whole rolled plate after hot-dip galvanizing were analyzed and compared. The results show that when the tested steel is annealed at 795 ℃ for 150 s and hot-dip galvanized, the microstructure is mainly composed of ferrite and martensite, the grain size of ferrite is between 2.3-6.0 μm, and the volume fraction of martensite is about 21%. After galvanizing, the tensile strength and yield strength are 825 MPa and 505 MPa respectively, the elongation after fracture is 19%, and along the width of the plate, the fluctuation of tensile strength is within 20 MPa, that of the yield strength is within 4 MPa, and that of the elongation is within 1%. When the transverse 180° bending test with bending diameter of 3 times of the plate thickness was conducted, the results show that no cracking happens from the head to the tail of the hot-dip galvanized whole coil steel, indicating that the requirements of user for high bending performance are met.

Key words: ultra-high strength dual-phase steel, hot-dip galvanizing, microstructure, martensite content, bending performance

中图分类号:

TG166.4

刘靖宝, 田秀刚, 张杰, 魏焕君, 杨丽娜, 王朝, 李孟星. 低成本800 MPa级镀锌超高强度双相钢的微观组织与性能[J]. 金属热处理, 2021, 46(8): 73-76.

Liu Jingbao, Tian Xiugang, Zhang Jie, Wei Huanjun, Yang Lina, Wang Zhao, Li Mengxing. Microstructure and properties of a low-cost 800 MPa galvanized ultra-high strength dual-phase steel[J]. Heat Treatment of Metals, 2021, 46(8): 73-76.

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低成本800 MPa级镀锌超高强度双相钢的微观组织与性能

Microstructure and properties of a low-cost 800 MPa galvanized ultra-high strength dual-phase steel

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