东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (3): 339-344.DOI: 10.12068/j.issn.1005-3026.2019.03.007

• 材料与冶金 • 上一篇    下一篇

冷轧低合金高强钢再结晶和析出行为研究

李志红1, 任家宽1, 霍建生2, 李建平1   

  1. (1. 东北大学 材料科学与工程学院, 辽宁 沈阳110819; 2. 唐钢中厚板材有限公司, 河北 唐山063016)
  • 收稿日期:2017-12-13 修回日期:2017-12-13 出版日期:2019-03-15 发布日期:2019-03-08
  • 通讯作者: 李志红
  • 作者简介:李志红(1992-),女,辽宁朝阳人,东北大学博士研究生; 李建平(1958-),男,吉林长春人,东北大学教授,博士生导师.
  • 基金资助:
    国家重点研发计划项目(2017YFB0304100).

Study on Recrystallization and Precipitation Behavior of Cold-Rolled Low-Alloy High Strength Steel

LI Zhi-hong1, REN Jia-kuan1, HUO Jian-sheng2, LI Jian-ping1   

  1. 1. School of Material Science & Engineering, Northeastern University, Shenyang 110819, China; 2. Tangshan Steel Plate Co., Ltd., Tangshan 063016, China.
  • Received:2017-12-13 Revised:2017-12-13 Online:2019-03-15 Published:2019-03-08
  • Contact: LI Jian-ping
  • About author:-
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摘要: 利用热模拟试验机研究了冷轧低合金高强钢的再结晶动力学规律,并基于JMAK方程建立了再结晶动力学模型,为退火过程中铁素体再结晶和析出行为的控制提供了理论依据.结果表明,随退火温度升高,铁素体达到完全再结晶时所用时间大大缩短;冷轧压下量相同时,初始贝氏体组织具有更高的位错密度和储存能;80℃/s快速加热条件下,回复和再结晶过程相应同步提前,且再结晶发生前的剩余变形储能增大,从而使铁素体再结晶快速完成.同时新工艺下实验钢析出粒子尺寸更均匀,体积分数更高,析出强化贡献更明显.

关键词: 冷轧, 低合金钢, 再结晶, 退火, 析出

Abstract: The kinetics of recrystallization in cold-rolled low-alloy high strength steel was studied by thermal simulation test. A kinetic model of recrystallization was built based on JMAK equation, which provided a theoretical basis to control ferrite recrystallization and precipitation behavior. The results show that the recrystallization completion time is greatly decreased with increasing annealing temperature. For the same reduction of cold rolling, the initial bainite structure contains a higher dislocation density and storage energy during annealing. The recovery and recrystallization process are synchronously advanced at the heating rate of 80℃/s, and the residual deformation storage energy increases before recrystallization so that the ferrite recrystallization can be quickly completed. Moreover, after the new process, the precipitation size in the experimental steel is more uniform and the volume fraction is higher, which lead to a better performance of precipitation strengthening.

Key words: cold-rolled, low-alloy steel, recrystallization, annealing, precipitation

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