中文摘要：

为研究工业纯钛的动态再结晶行为,利用Gleebe 实验机对工业纯钛在变形温度为700,800,900和950℃及应变速率为0．01,0．1,1和5 s-1的条件下进行热模拟压缩实验.应用加工硬化率对实验得到的应力-应变数据进行处理,结合变形后材料微观组织的分析,求得工业纯钛的动态再结晶临界条件.结果表明,工业纯钛在热变形过程中发生了回复与再结晶；发生动态再结晶时,再结晶临界应变随温度的升高及变形速率的降低而减小.将 lnθ-ε曲线的拐点处对应的应变作为材料的再结晶临界应变是合理的,工业纯钛动态再结晶临界应变εc 与峰值应变εp 之间满足εc ＝0．485εp .

英文摘要：

The hot temperature compression test of commercially pure titanium was carried out by Gleeble-1500D thermal simulation test machine to investigate the dynamic recrystallization behavior.The deformation tempera-tures were 700,800,900 and 950 ℃.The strain rates were 0.01,0.1,1 and 5 s-1 .Dynamic recrystallization critical condition was obtained by calculation of true stress-strain data from the experiment and the analysis of material microstructure after deformation.The results show that the dynamic recovery and recrystallization oc-cur during thermal deformation process.Recrystallization critical strain decreases with the rise of temperature and the decrease of deformation rate when dynamic recrystallization occurs.It was reasonable to regard the in-fection point of lnθ-ε curve as material recrystallization critical strain.There was a relationship between dynamic recrystallization critical strain and peak strain：εc =0.485εp .