金属热处理 ›› 2022, Vol. 47 ›› Issue (1): 88-93.DOI: 10.13251/j.issn.0254-6051.2022.01.015

• 材料研究 • 上一篇    下一篇

高Nb-Ti新能源汽车用无取向硅钢热轧过程的再结晶行为

范合合1, 金自力1,2,3, 任慧平1,2,3, 游兴华1   

  1. 1.内蒙古科技大学 材料与冶金学院, 内蒙古 包头 014010;
    2.内蒙古新金属材料重点实验室, 内蒙古 包头 014010;
    3.内蒙古生产力促进中心, 内蒙古 包头 014010
  • 收稿日期:2021-07-22 修回日期:2021-09-13 出版日期:2022-01-25 发布日期:2022-02-18
  • 通讯作者: 金自力,教授,E-mail:jinzl6310@126.com
  • 作者简介:范合合(1995—),女,硕士研究生,主要研究方向为新能源汽车用无取向硅钢热轧析出行为,E-mail: 1083346003@qq.com。
  • 基金资助:
    国家自然科学基金(51761033);内蒙古自治区科技计划(2020GG0150);内蒙古自治区科技重大专项(zdzx2018032)

Recrystallization behavior during hot rolling of high Nb-Ti non-oriented silicon steel for new energy vehicle

Fan Hehe1, Jin Zili1,2,3, Ren Huiping1,2,3, You Xinghua1   

  1. 1. School of Materials and Metallurgy,Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
    2. Inner Mongolia Key Laboratory of New Metal Materials, Baotou Inner Mongolia 014010, China;
    3. Inner Mongolia Productivity Promotion Center, Baotou Inner Mongolia 014010, China
  • Received:2021-07-22 Revised:2021-09-13 Online:2022-01-25 Published:2022-02-18

摘要: 利用蔡司显微镜和Nano Measurer金相分析软件,研究了不同加热温度下新能源汽车用高Nb-Ti无取向硅钢显微组织的演变规律,并利用ICP-MS对不同加热温度下Nb、Ti的固溶量进行检测分析;然后采用热模拟方法研究了热轧过程中试验钢的再结晶行为。结果表明:随着加热温度升高,试验钢的晶粒尺寸增加明显,而Nb、Ti的固溶量仅略有增加。当加热温度为1230 ℃、变形温度分别为1100、1050、1000 ℃时,在应变速率0.1 s-1、变形量30%和应变速率1 s-1、变形量80%的条件下单道次压缩后的试验钢均未发生动态再结晶行为,而在应变速率为1 s-1、变形量为40%的条件下,在1100 ℃及1050 ℃单道次压缩后再保温30 s以上时有静态再结晶行为发生,显微组织大部分为等轴晶粒,但是在1000 ℃变形单道次压缩后再保温50 s的显微组织仍以未再结晶的长条晶粒为主。

关键词: 新能源汽车, 无取向硅钢, 加热温度, 再结晶, 软化率

Abstract: Microstructure evolution of high Nb-Ti non-oriented silicon steel for new energy vehicle at different heating temperatures was studied by using Zeiss microscope and Nano Measurer metallographic analysis software, the dissolved amounts of Nb and Ti at different heating temperatures were measured and analyzed by ICP-MS (Inductively coupled plasma mass spectrometry), and then the recrystallization behavior of the steel during hot rolling was studied by means of thermal simulation. The results show that the higher the heating temperature, the more significant the increase in the grain size, but the dissolved amounts of Nb and Ti only slightly increase. When heating at 1230 ℃ and deformed at 1100, 1050, 1000 ℃ respectively, the steel has no dynamic recrystallization behavior after single pass compression with deformation of 30% at strain rate of 0.1 s-1 or with deformation of 80% at strain rate of 1 s-1. However, when holding for more than 30 s after single pass compression of 40% at 1100 ℃ and 1050 ℃ respectively under strain rate of 1 s-1, static recrystallization behavior occurs and the microstructure of the steel is mostly isoaxial equiaxial grains, but the microstructure is mainly of elongated unrecrystallized grains when holding even for 50 s after deformation at 1000 ℃ with the same condition.

Key words: new energy vehicle, non-oriented silicon steel, heating temperature, recrystallization, softening rate

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