金属热处理 ›› 2025, Vol. 50 ›› Issue (8): 220-224.DOI: 10.13251/j.issn.0254-6051.2025.08.034

• 工艺研究 • 上一篇    下一篇

预变形对QP980高强钢组织与性能的影响

张茜1, 王雅坤2, 牛星辉1, 吕浩1, 王嘉伟3   

  1. 1.唐山钢铁集团有限责任公司 技术中心, 河北 唐山 063000;
    2.唐山学院 人工智能学院, 河北 唐山 063000;
    3.唐山学院 机电工程学院, 河北 唐山 063000
  • 收稿日期:2025-03-06 修回日期:2025-06-19 出版日期:2025-08-25 发布日期:2025-09-10
  • 通讯作者: 王嘉伟,工程师,博士,E-mail:wangjw1120@163.com
  • 作者简介:张 茜(1991—),女,高级工程师,硕士,主要研究为汽车板冲压成形仿真及高强钢材料性能表征等,E-mail:zhangqian07@hbisco.com。
  • 基金资助:
    河北省自然科学基金(E2025105045)

Effect of pre-strain on microstructure and properties of QP980 high strength steel

Zhang Xi1, Wang Yakun2, Niu Xinghui1, Lü Hao1, Wang Jiawei3   

  1. 1. Technology Center, Tangshan Iron and Steel Group Co., Ltd., Tangshan Hebei 063000, China;
    2. School of Artificial Intelligence, Tangshan University, Tangshan Hebei 063000, China;
    3. School of Mechanical and Electrical Engineering, Tangshan University, Tangshan Hebei 063000, China
  • Received:2025-03-06 Revised:2025-06-19 Online:2025-08-25 Published:2025-09-10

摘要: 以第三代先进高强钢QP980为研究对象,通过单轴拉伸试验对较大尺寸的拉伸试样施加不同预变形(0%、3%、5%、7%、9%),借助扫描电镜(SEM)和X射线衍射仪(XRD)研究了预变形过程中的组织和相的演变,之后对预变形试样的拉伸性能、加工硬化行为及局部成形性能进行了分析。结果表明,随着预变形量从0%增加到9%,组织中的残留奥氏体向马氏体发生转变,残留奥氏体含量由初始的9.65%降低到4.20%后趋于稳定,铁素体被拉长,部分马氏体破碎并产生微裂纹。随预变形量的增大,预变形试样的强度升高,屈强比增加且逐渐趋近于1,总伸长率基本不变,加工硬化能力和局部成形性能降低。

关键词: 高强钢, 预变形, 组织, 性能

Abstract: Taking the third-generation advanced high strength steel QP980 as the research object, different pre-strains (0%, 3%, 5%, 7%, 9%) were applied to relatively large-sized specimens through uniaxial tensile tests. The microstructure and phase evolution during the pre-strain process were studied by using scanning electron microscope (SEM) and X-ray diffractometer (XRD). Subsequently, the tensile properties, work hardening behavior and local formability of the pre-strain specimen were analyzed. The results show that as the pre-strain increases from 0% to 9%, the retained austenite transforms into martensite, and the content decreases from the initial 9.65% to 4.20% before stabilizing. The ferrite is stretched and some martensite is broken, generating microcracks. With pre-strain increasing, the strength of the pre-strain specimen increases, the yield strength ratio increases and gradually approaches 1, the total elongation remains basically unchanged, and the work hardening ability and local formability decrease.

Key words: high strength steel, pre-strain, microstructure, properties

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