李红英,巫荣海,魏冬冬,李阳华,龙功名,王晓峰

• 1:中南大学材料科学与工程学院
• 2:衡阳钢管(集团)有限公司

摘要(Abstract)：

利用Gleeble-1500热模拟机进行热压缩实验,对T23钢在变形速率为0.01～5 s-1,变形温度为1000～1250℃的热变形行为和组织进行研究。根据实验获得的真应力-真应变曲线,基于动态材料模型建立了热加工图,并推导出流变应力方程。结果表明:T23钢在热压缩过程中存在动态回复和动态再结晶两种软化机制,变形温度越高或变形速率越小,越容易发生动态再结晶。真应变量为0.5和0.6的加工图具有4个类似的失稳区,功率耗散效率因子的分布规律大致相同,峰值区在1175～1240℃和0.03～0.25 s-1范围,对应的峰值效率分别为47.3%(0.5)和46.3%(0.6)。流变应力方程中,结构因子A、应力水平参数α、应力指数n分别为5.23×1012s-1、0.01155 MPa-1和4.46869,热变形激活能为368.65 kJ/mol。

关键词(KeyWords)： T23钢;热变形行为;真应力-真应变曲线;热加工图;流变应力方程

Abstract:

Keywords:

基金项目(Foundation): 湖南省科技重大专项(2007FJ1014)

作者(Author): 李红英,巫荣海,魏冬冬,李阳华,龙功名,王晓峰

DOI: 10.13289/j.issn.1009-6264.2013.01.015

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