T23钢的热变形行为  

Thermal deformation behavior of T23 steel

作　　者：李红英[1] 巫荣海[1] 魏冬冬[1] 李阳华[1,2] 龙功名 王晓峰[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]衡阳钢管(集团)有限公司,湖南衡阳421001

出　　处：《材料热处理学报》2013年第1期96-101,共6页Transactions of Materials and Heat Treatment

基　　金：湖南省科技重大专项(2007FJ1014)

摘　　要：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。The hot deformation behavior and corresponding microstructure of T23 steel were investigated at strain rates ranging from 0.01 to 5 s^-1 and at 1000 -1250 ℃ by hot compression test on a Gleeble 1500 thermal-mechanical simulator. True stress-true strain curves were obtained. Processing map was established based on the dynamic material model and flow stress equation was derivated. The results show that both dynamic recovery and dynamic recrystallization occur during hot compression test. The higher the temperature is and the smaller the strain rate is, the more easily the dynamic recrystallization occurs. The processing maps with strain of 0. 5 and 0.6 present four similar unstable areas, and the distribution of power dissipation factor is similar too. The peak area is 1175 - 1240 ℃ and 0. 03 -0.25 s^-1, corresponding to the peak efficiency of 47.3% （0. 5） and 46.3% （0. 6）. In flow stress equation, structure factor A is 5.23×10^12 s^-1 , stress level parameters α is 0. 01155 MPa^-1 , stress index n is 4. 46869, respectively. Deformation activation energy is 368.65 kJ/mol.

关 键 词：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 

分 类 号：TG142.1[一般工业技术—材料科学与工程]