J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (10): 913-919.

• Reviews • 上一篇    下一篇

Dynamic Recrystallization Behavior of a Heat-resistant Martensitic Stainless Steel 403Nb during Hot Deformation

曾周燏1,陈礼清1,朱伏先2,刘相华3   

  1. 1. 东北大学
    2. 东北大学轧制技术及连轧自动化国家重点实验室
    3. 轧制技术及连轧自动化国家重点实验室（东北大学）
  • 收稿日期:2011-05-16 修回日期:2011-06-23 出版日期:2011-10-31 发布日期:2011-10-24
  • 通讯作者: 陈礼清
  • 基金资助:

    国家自然科学基金;中央高校基本科研业务费专项资金

Dynamic Recrystallization Behavior of a Heat-resistant Martensitic Stainless Steel 403Nb during Hot Deformation

Zhouyu Zeng, Liqing Chen, Fuxian Zhu, Xianghua Liu   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, 3-11 Wenhua Road, Shenyang 110819, China
  • Received:2011-05-16 Revised:2011-06-23 Online:2011-10-31 Published:2011-10-24
  • Contact: Chen Liqing Chen
  • Supported by:

    the Fundamental Research Funds for the Central Universities (Grant No. N100507003) and the National Natural Science Foundation of China (Key Program, Grant No. 50634030)

RichHTML

1

摘要： Dynamic recrystallization (DRX) behaviors of a heat-resistant martensitic stainless steel 403Nb during hot deformation have been investigated by single-pass thermo-mechanical simulative experiment at temperatures of 900~1150℃ and strain rates of 0.01~1s-1. The results show that the true stress-strain curves of this alloy can be classified into two types, one is of dynamic recovery and the other is of dynamic recrystallization. The DRX in 403Nb alloy is easy to occur at strain rates lower than 0.5 s-1 and deformation temperatures higher than 1000 ℃. Using regression analysis, the stress multiplier (α) and apparent stress exponent (n) were calculated to be 0.0153 and 3.23, respectively, while the activation energy (Q) for DRX of 403Nb was calculated to be 367.293 kJ/mol. The constitutive equation of peak stress for DRX was also obtained. Based on P-J method, the critical strain for DRX was accurately determined. The mathematical models of peak strain and kinetic equation for DRX of 403Nb steel were finally established.

Abstract: Dynamic recrystallization (DRX) behaviors of a heat-resistant martensitic stainless steel 403Nb during hot deformation have been investigated by single-pass thermo-mechanical simulative experiment at temperatures of 900-1150°C and strain rates of 0.01-1 s-1. The results show that the true stress-true strain curves of this alloy can be classified into two types, one is of dynamic recovery and the other is of dynamic recrystallization. The DRX in 403Nb alloy is easy to occur at strain rates lower than 0.5 s-1 and deformation temperatures higher than 1000°C. Using regression analysis, the stress multiplier (α) and apparent stress exponent (n) were calculated to be 0.0153 and 3.22, respectively, while the activation energy (Qd) for DRX of 403Nb was calculated to be 367.293 kJ/mol. The constitutive equation of peak stress for DRX was also obtained. Based on P-J method, the critical strain for DRX was accurately  determined. The mathematical models of peak strain and kinetic equation for DRX of 403Nb steel were finally established.

Key words: 403Nb steel, Dynamic recrystallization, Hot deformation, Critical strain