金属热处理 ›› 2022, Vol. 47 ›› Issue (2): 70-73.DOI: 10.13251/j.issn.0254-6051.2022.02.013

• 材料研究 • 上一篇    下一篇

Ti含量对IF钢再结晶温度及力学性能的影响

冯运动1,2, 邹宇明1,2, 丁桦1,2   

  1. 1.东北大学 材料科学与工程学院, 辽宁 沈阳 110819;
    2.东北大学 辽宁省轻量化用关键金属结构材料重点实验室, 辽宁 沈阳 110819
  • 收稿日期:2021-09-17 修回日期:2021-11-27 出版日期:2022-02-25 发布日期:2022-04-01
  • 通讯作者: 丁 桦,教授,E-mail:dingh@smm.neu.edu.cn
  • 作者简介:冯运动(1995—),男,硕士研究生,主要研究方向为铌钛微合金化IF钢再结晶行为及组织性能,E-mail:1471588921@qq.com。

Effect of Ti content on recrystallization temperature and mechanical properties of IF steel

Feng Yundong1,2, Zou Yuming1,2, Ding Hua1,2   

  1. 1. School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110819, China;
    2. The Key Laboratory of Lightweight Structure Materials of Liaoning Province, Northeastern University, Shenyang Liaoning 110819, China
  • Received:2021-09-17 Revised:2021-11-27 Online:2022-02-25 Published:2022-04-01

摘要: 通过硬度试验、拉伸试验、场发射扫描电镜(SEM)和透射电镜(TEM)观察,研究了Ti含量对IF钢再结晶温度的影响,并研究了不同Ti含量IF钢冷轧后在不同退火温度下的性能变化。结果表明,随着Ti含量的降低,IF钢中纳米析出物尺寸减小、分布稀疏且体积分数降低,钉扎作用减弱,再结晶温度下降;低Ti含量IF钢经630 ℃退火保温10 h后,屈服强度为198 MPa,抗拉强度为312 MPa,伸长率为36.78%,应变硬化指数(n值)为0.25,塑性应变比(r值)为2.42,符合超深冲钢的性能要求。

关键词: IF钢, Ti含量, 再结晶, 退火, 力学性能

Abstract: Effect of Ti content on recrystallization temperature and mechanical property change of the cold-rolled IF steel annealed at different temperatures was studied by means of hardness test, tensile test, field emission scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the size, distribution and volume fraction of nano-precipitates in the IF steel decrease with the decrease of Ti content, and the pinning effect and recrystallization temperature decrease. After annealing at 630 ℃ for 10 h, the yield strength, tensile strength, elongation, strain hardening exponent (n value) and plastic strain ratio (r value) of the IF steel with lower Ti content are 198 MPa, 312 MPa, 36.78%, 0.25 and 2.42, respectively, which meet the performance requirements of ultra-deep drawing steels.

Key words: interstitial-free steel, Ti content, recrystallization, annealing, mechanical properties

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