摘要
在Gleeble-3800热模拟试验机上对TC4钛合金进行单向压缩实验,研究该合金在压缩量为50%、温度为700~900℃、应变速率为0.001~1 s^(-1)条件下的高温变形行为。用金相显微镜观察TC4钛合金高温压缩实验后的微观组织,研究TC4钛合金的动态再结晶过程,分析了影响TC4钛合金层状组织动态球化的因素。用三次多项式拟合加工硬化率与流变应力曲线确定了临界应变,根据TC4钛合金的应力-应变曲线研究了球化动力学模型。结果表明,变形温度的升高和应变速率的减小会促进动态再结晶过程。
The unidirectional compression experiment of TC4 titanium alloy was carried out on Gleeble-3800 thermal simulator test machine.The high temperature deformation behavior of alloy was studied with the compression amount of 50%,temperature of 700-900℃and strain rate of 0.001-1 s^(-1).The microstructure of TC4 titanium alloy after high temperature compression experiment was observed by metallographic microscope,and the dynamic recrystallization process of TC4 titanium alloy was studied,and the factors affecting the dynamic spheroidization of layered structure of TC4 titanium alloy were analyzed.The critical strain was determined by fitting the work hardening rate and flow stress curve with cubic polynomial.The spheroidization dynamic model was studied according to the flow stress-strain curves of TC4 titanium alloy.The results show that the increase of deformation temperature and the decrease of strain rate can promote the dynamic recrystallization process.
作者
朱艳春
牛嘉伟
牛勇
郭晓峰
ZHU Yan-chun;NIU Jia-wei;NIU Yong;GUO Xiao-feng(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030000,China;China Heavy Machinery Research Institute Co.,Ltd.,Xi′an 710032,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2022年第4期128-134,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(52075509)
山西省高等学校科技创新项目(2020L0351)
太原科技大学博士启动基金资助项目(20192007,20202050)。
关键词
TC4钛合金
球化动力学
热变形
微观组织
TC4 titanium alloy
spheroidization dynamics
thermal deformation
microstructure
作者简介
第一作者/通信作者:朱艳春,女,1982年生,博士,副教授,主要从事轻合金先进成形技术与仿真优化研究,E-mail:lzlzyc@126.com。
