金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 6-10.DOI: 10.13251/j.issn.0254-6051.2020.01.002

• 会议专栏 • 上一篇    下一篇

退火温度对冷轧DP980钢力学性能的影响

康涛1,2, 郭杰1,2, 周伟3, 陈俊3, 邝春福4, 赵征志1,2   

  1. 1. 北京科技大学 钢铁共性技术协同创新中心, 北京 100083;
    2. 北京科技大学 现代交通金属材料与加工技术北京实验室, 北京 100083;
    3. 攀钢集团西昌钢钒有限公司, 四川 西昌 615000;
    4. 攀钢集团研究院有限公司, 四川 攀枝花 617000
  • 收稿日期:2019-06-12 出版日期:2020-01-25 发布日期:2020-04-03
  • 通讯作者: 赵征志,研究员,E-mail:zhaozhzhi@ustb.edu.cn
  • 作者简介:康 涛(1992—),男,博士研究生,主要研究方向为高强度汽车用钢研发及应用,E-mail:13220101686@163.com。
  • 基金资助:
    国家自然科学基金(51574028)

Effect of annealing temperature on mechanical properties of cold-rolled DP980 steel

Kang Tao1,2, Guo Jie1,2, Zhou Wei3, Chen Jun3, Kuang Chunfu4, Zhao Zhengzhi1,2   

  1. 1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;
    2. Modern Transportation Metal Materials and Processing Technology Beijing Laboratory Technology, University of Science and Technology Beijing, Beijing 100083, China;
    3. Pangang Group Xichang Steel Vanadium Co., Ltd., Xichang Sichuan 615000, China;
    4. Pangang Group Research Institute Co., Ltd., Panzhihua Sichuan 617000, China
  • Received:2019-06-12 Online:2020-01-25 Published:2020-04-03

摘要: 利用连续退火模拟机对DP980试验钢进行了连续退火试验,并通过扫描电镜、电子背散射衍射、透射电镜等研究了不同退火温度下(775、800、825和850 ℃),试验钢显微组织的演变规律和力学性能的变化趋势。结果表明:试验钢的屈服强度随着退火温度的升高而不断增大(从705 MPa增大到850 MPa),抗拉强度和断后伸长率则随着退火温度的升高而不断减小(抗拉强度从1150 MPa减小到1030 MPa;伸长率从8.9%减小到5.3%),这与试验钢的显微组织构成和形态分布密切相关。此外,不同退火温度下,试验钢的加工硬化率曲线均呈现单调下降的趋势。

关键词: 退火温度, DP980钢, 微观组织, 力学性能, 加工硬化

Abstract: Continuous annealing experiments were carried out on the DP980 tested steel by means of continuous annealing simulator. The evolution of microstructure and the change of mechanical properties of experimental steel under different annealing temperatures (775, 800, 825, 850 ℃) were studied by means of SEM, EBSD and TEM. The results show that with the annealing temperature increasing, the yield strength of the steel increases gradually from 705 MPa to 850 MPa, the tensile strength and the elongation after fracture decrease gradually (tensile strength reduced from 1150 MPa to 1030 MPa; elongation reduced from 8.9% to 5.3%), which are closely related to the structure and morphology of the sample. In addition, the hardening rate curves of the experimental steels show a monotonous decline at different annealing temperatures.

Key words: annealing temperature, DP980 steel, microstructure, mechanical properties, work hardening

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