退火工艺路径对980 MPa级高强钢组织及性能的影响

doi:10.13251/j.issn.0254-6051.2023.03.005

金属热处理 ›› 2023, Vol. 48 ›› Issue (3): 25-31.DOI: 10.13251/j.issn.0254-6051.2023.03.005

退火工艺路径对980 MPa级高强钢组织及性能的影响

邱木生^1,2, 韩赟², 滕华湘², 白振华¹

1.燕山大学国家冷轧板带装备及工艺工程技术研究中心, 河北秦皇岛 006004;
2.首钢集团有限公司技术研究院, 北京 100043

收稿日期:2022-10-17 修回日期:2022-12-30 出版日期:2023-03-25 发布日期:2023-04-25
作者简介:邱木生(1990—),男,高级工程师,博士研究生,主要研究方向为汽车用钢开发,E-mail:15832557342@163.com。
基金资助:
河北省重点研发计划(20311004D)

Effect of annealing process path on microstructure and properties of 980 MPa grade high-strength steel

Qiu Musheng^1,2, Han Yun², Teng Huaxiang², Bai Zhenhua¹

1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao Hebei 066004, China;
2. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China

Received:2022-10-17 Revised:2022-12-30 Online:2023-03-25 Published:2023-04-25

摘要/Abstract

摘要： 为了提升980 MPa级高强钢局部成形性能,采用万能试验机、场发射扫描电镜(SEM)、电子背散射衍射(EBSD)及综合成形试验机等研究了不同退火工艺路径的980 MPa高强钢微观组织和力学性能,并评价了其扩孔及局部成形性能。结果表明,除了有铁素体和马氏体两相外,新型Q&T工艺的组织结构还存在回火马氏体中间相,铁素体和马氏体平均晶粒尺寸分别为3.14 μm和2.62 μm,马氏体面积分数为61.0%,而传统工艺下为典型的铁素体及马氏体双相组织,铁素体和马氏体平均晶粒尺寸分别为4.77 μm和2.77 μm,马氏体面积分数为35.8%。两种工艺伸长率相差不大,但屈服强度和扩孔率具有明显差异,新型Q&T工艺下获得了更高的屈强比及扩孔性能,得益于其更小铁素体晶粒尺寸及铁素体和马氏体硬度差。传统工艺下真实断裂应变(TFS)与真实均匀应变ε_u比值为7.0,而新型Q&T工艺下比值为15.2,因此新型Q&T工艺下具有更优异的局部成形特性。

关键词: 980 MPa级高强钢, 组织, 扩孔, 局部成形性

Abstract: In order to improve the local formability of 980 MPa high-strength steel, the microstructure and mechanical properties of 980 MPa high-strength steel with different annealing process paths were studied by means of universal testing machine, field emission scanning electron microscope(SEM), electron backscattering diffraction(EBSD) and comprehensive forming testing machine. Moreover, its effect on hole expansion ratio and local formability were evaluated. The results show that in addition to the two phases of ferrite and martensite, the microstructure of the new quenching & tempering(Q&T) process also contains tempered martensite, the average grain size of ferrite and martensitic is 3.14 μm and 2.62 μm, respectively, and the martensite area fraction is 61.0%, while the typical ferrite and martensitic dual phases are obtained under the traditional process, the average grain size of ferrite and martensite is 4.77 μm and 2.77 μm, respectively, and the martensite area fraction is 35.8%. The elongation of the two processes is comparable, but the yield strength and hole expansion ratio are significantly different, and the higher yield ratio and hole expansion ratio are achieved under the new Q&T process, which is attributed to its smaller ferrite grain size and the difference in ferrite and martensite hardness. The ratio of true fracture strain(TFS) to true uniform strain(ε_u) of the traditional process is 7.0, while the new Q&T process is 15.2, therefore the new Q&T process has excellent characteristics in local formability.

Key words: 980 MPa grade high-strength steel, microstructure, hole expansion, local formability

中图分类号:

TG156.1

邱木生, 韩赟, 滕华湘, 白振华. 退火工艺路径对980 MPa级高强钢组织及性能的影响[J]. 金属热处理, 2023, 48(3): 25-31.

Qiu Musheng, Han Yun, Teng Huaxiang, Bai Zhenhua. Effect of annealing process path on microstructure and properties of 980 MPa grade high-strength steel[J]. Heat Treatment of Metals, 2023, 48(3): 25-31.

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退火工艺路径对980 MPa级高强钢组织及性能的影响

Effect of annealing process path on microstructure and properties of 980 MPa grade high-strength steel

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