东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (7): 960-964.DOI: 10.12068/j.issn.1005-3026.2014.07.011

• 材料与冶金 • 上一篇    下一篇

低Ni，Cr，Cu和Mo高性能桥梁钢的动态再结晶行为

陈俊，唐帅，刘振宇，王国栋   

  1. (东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2013-09-02 修回日期:2013-09-02 出版日期:2014-07-15 发布日期:2014-04-11
  • 通讯作者: 陈俊
  • 作者简介:陈俊(1982-)，男，河南南阳人，东北大学博士研究生;刘振宇(1967-)，男，内蒙古赤峰人，东北大学教授，博士生导师;王国栋(1942-)，男，辽宁大连人，东北大学教授，博士生导师，中国工程院院士.
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N110607003，N110307002)

Dynamic Recrystallization Behaviors of High Performance Bridge Steels with Lower Ni，Cr，Cu and Mo Contents

CHEN Jun， TANG Shuai， LIU Zhenyu， WANG Guodong   

  1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Received:2013-09-02 Revised:2013-09-02 Online:2014-07-15 Published:2014-04-11
  • Contact: TANG Shuai
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摘要： 采用单道次压缩实验研究了一种低Ni，Cr，Cu和Mo高性能桥梁钢的动态再结晶行为.同时，采用9次多项式对实测真应力-真应变曲线进行了拟合，消除了实测曲线上的波动，进而确定了不同条件下的加工硬化率-真应力曲线.加工硬化率-真应力曲线特征表明，在所研究的不同热压缩变形工艺条件下，均发生了动态再结晶.通过计算将常数α修正为0009MPa-1，得到了实验钢的动态再结晶激活能，确定了εc=063εp关系式，建立了动态再结晶临界应变模型.而且降低Ni，Cr，Cu和Mo含量将显著降低动态再结晶激活能.

关键词: 高性能桥梁钢, 热模拟, 动态再结晶, 激活能, 临界应变

Abstract: The dynamic recrystallization behaviors of high performance bridge steel with lower Ni， Cr， Cu and Mo contents were investigated using single pass compression tests. At the same time， the true stresstrue strain curves were fitted and smoothed using a ninthorder polynomial in order to eliminate fluctuations in experimental curves， and the strain hardening rate vs true stress curves under different conditions were determined. The characteristics of the strain hardening rate vs true stress curves show that the dynamic recrystallization has occurred for different hot compression deformation processes studied. The constant α was modified as 0009MPa-1， the dynamic recrystallization activation energy was gained， the relationship of εc =063εp was determined and the critical strain model for predicting dynamic recrystallization initiation was established. Moreover， the dynamic recrystallization activation energy was significantly lowered with reducing Ni， Cr， Cu and Mo contents.

Key words: high performance bridge steels, thermosimulation, dynamic recrystallization, activation energy, critical strain

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