ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2005, Vol. 26 ›› Issue (6): 8-9.

• 试验研究 • 上一篇    下一篇

Ti-IF钢铁素体变形动态再结晶临界应变模型

徐光,徐楚韶,赵嘉蓉,刘显军,熊俊伟   

  1. 武汉科技大学材料与冶金学院,武汉430081;
    重庆大学材料科学与工程学院,重庆400044
  • 收稿日期:2005-06-02 出版日期:2005-11-08 发布日期:2023-04-11
  • 作者简介:徐 光(1961-),男,教授,1982年北京科技大学毕业,从 事金属材料组织、性能和工艺研究。

Model of Dynamic Recrystallization Critical Strain in Ferrite Deformation of Ti-IF Steel

Xu Guang, Xu Chushao , Zhao Jiarong, Liu Xianjun ,Xiong Junwei   

  1. College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081;
    College of Material Science and Engineering, Chongqing University, Chongqing 400044
  • Received:2005-06-02 Published:2005-11-08 Online:2023-04-11

摘要: 用Thermecmaster-Z热模拟试验机试验得出成分为0.006 7%C-0.045 0%Ti的Ti-IF(无间隙原子)钢在变形温度750~900℃和变形速率0.1~40 s-1时的应力-应变曲线,确定了Zener-Holloman参数Z与应变速率.ε和温度T(K)的关系式Z=.εexp(39 507/T),并建立了临界应变εc与原始晶粒尺寸d0和Z参数的临界应变方程εc=2.314 4×10-3×d-0.8003 9×Z0.050。结果表明,在相同变形速率下,850℃变形时动态再结晶最易发生,当变形温度提高至900℃(两相区)时,即使在低变形速率(1 s-1),也不发生动态再结晶。当变形速率大于1 s-1时,Ti-IF钢热加工时不能出现动态再结晶。临界应变预测值与实测值比较,平均误差≤5%。

关键词: Ti-IF钢, 铁素体变形, 动态再结晶, 临界应变模型

Abstract: Hie stress-strain curves of 0.006 7C-0.045 0Ti Ti-IF (interstitial free) steel with deformation temperature 750 - 900 °C and deformation rate 0.1 - 40-1 has been tested and obtained  Ihennecmaster-Z thermal simulation test machine, based on that the relational expression between Zener-Holloman parameter Z and deformation rate ε - temperature T (K) : Z= e exp (39 507/T) is defined, and the critical strain fonnula for relation between critical strain ec and original grain size Z parameter: ec = 2.314 4 x 10-3 X d-0.8003 9×Z0.050 is established. The results showed that with same deformation rate the dynamic recrystallization of steel occurred most easily at 850 ℃, as deformation temperature increased to 900 °C (dual phase region) , the dynamic recrystallization un-occurred even at low deformation rate (1 s-1 ) , and as deformation rate was more than 10 s-1, the dynamic recrystallization of Ti-IF steel also un-occurred during hot rolling. With comparison between predicted value of critical strain and measured value, the average error was no more than 5 % .