摘要
利用等温压缩实验研究了β转变组织TA15钛合金在变形温度750~950℃、应变速率0.001~10 s^(−1)范围内的流动软化行为,定量分析了变形热效应和微观组织演变对流动软化行为的影响。结果表明:变形热效应是β转变组织TA15钛合金流动软化的重要机制,变形热软化程度随着变形温度的下降和应变速率的增大而增强,最高占到总流动软化程度的48.2%;动态再结晶、动态回复和流动失稳缺陷等形式的微观组织演变是流动软化的主要机制。基于动态材料模型,利用应变速率敏感性指数预测了3种微观组织演化形式主导的软化区域,并通过微观组织观测进行了验证。
The flow softening of TA15 titanium alloy with beta transformed microstructure was investigated by means of hot compression tests performed at the temperature range of 750−950℃and strain rate of 0.001−10 s^(−1).The effect of deformation temperature and strain rate on the flow softening and the flow softening mechanisms were examined.The thermal softening due to deformation heating is an important mechanism of flow softening.The degree of thermal softening increases with the decrease of deformation temperature and the increase of strain rate,and the maximum is 48.2%to the total flow softening degree.The microstructural evolution,including dynamic recrystallization,dynamic recovery and flow instability defects,is the main mechanism of flow softening.Three types of softening regions dominated by microstructure evolution were identified by strain rate sensitivity index based on the dynamic material model,and verified by microstructure observation.
作者
董显娟
胡生双
徐勇
鲁世强
DONG Xian-juan;HU Sheng-shuang;XU Yong;LU Shi-qiang(National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China;Aviation Xi’an Aircraft Industry Croup Co.,Ltd.,Xi’an 710089,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2021年第4期858-867,共10页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51864035)
航空科学基金资助项目(2019ZE056009
2020Z047056003)
江西省重点研发计划资助项目(20202BBEL53012)。
关键词
TA15钛合金
流动软化
变形热效应
微观组织演变
TA15 titanium alloy
flow softening
deformation heating
microstructural evolution
