东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2010, Vol. 31 ›› Issue (2): 202-206.DOI: -

• 论著 • 上一篇    下一篇

Q420钢热变形行为及流变应力模型研究

李婧;赵德文;刘相华;   

  1. 东北大学轧制技术及连轧自动化国家重点实验室;
  • 收稿日期:2013-06-20 修回日期:2013-06-20 出版日期:2010-02-15 发布日期:2013-06-20
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金重点资助项目(50634030);;

Investigation on hot deformation behavior and mathematical models of flow stress of Q420 HSLA steel

Li, Jing (1); Zhao, De-Wen (1); Liu, Xiang-Hua (1)   

  1. (1) State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China
  • Received:2013-06-20 Revised:2013-06-20 Online:2010-02-15 Published:2013-06-20
  • Contact: Li, J.
  • About author:-
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摘要： 利用Gleeble-2000热模拟实验装置对Nb,V微合金化Q420高强度低合金钢(HSLA)进行了高温单道次压缩实验.研究了变形条件对该钢的动态再结晶行为的影响,并建立了一系列完整的描述高温变形的流变应力模型.实验结果表明:动态再结晶只在较高变形温度和低应变速率下发生,且峰值应力、稳态应力、峰值应变和临界应变与lnZ呈线性关系;流变应力预测模型和实验结果吻合良好.

关键词: HSLA钢, 动态再结晶, 激活能, 峰值应变/应力, 流变应力, 数学模型

Abstract: The effect of deformation conditions on dynamic recrystallization behavior of Nb-V microalloyed HSLA steel was investigated via high-temperature single pass reduction tests on a Gleeble-2000 thermomechanical simulator, with some mathematical models developed for flow stress during hot deformation. It was found that the dynamic recrystallization occurs only at higher temperature and lower strain rate, and the peak strain/stress, steady strain and critical stress are all in linear relationship with lnZ. The prediction models developed for flow stress indicated that they are in good agreement with experimental results.

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