平面应变压缩工业纯钛的动态再结晶研究

Study on Dynamic Recrystallization of Commercially Pure Titanium During Plane Strain Compression

利用Gleeble—3800型热模拟实验机,在变形温度650~800℃、应变速率1s^(-1)和5s^(-1)条件下对工业纯钛进行多道次平面应变压缩实验,模拟实际热轧生产。通过真应力、应变、软化率和加工硬化率等数据,研究工业纯钛多道次变形过程的软化现象和动态再结晶临界应变。结果表明,工业纯钛间歇时间内的软化率随着变形温度升高和应变速率降低而增加;再结晶临界应变量随着变形温度升高而减小,且动态再结晶临界应变ε_c与峰值应变ε_p存在线性关系:ε_c=0.467 6ε_p。

Multi-pass plane strain compression tests of commercially pure titanium were carried out on Gleeble—3800thermal simulation test machine to simulate practical hot rolling process,and the deformation temperature is 650～800 ℃ and the strain rate is 1s^（-1） or 5s^（-1） .Based on the data of true stress and strain,softening rate and work-hardening rate,softening behavior and dynamic recrystallization critical strain of commercially pure titanium were investigated during multi-pass deformation.The results show that softening rate of commercially pure titanium increases with deformation temperature rising and strain rate decreasing in the interval,and its recrystallization critical strain decreases with deformation temperature increasing.There is linear relationship between dynamic recrystallization critical strainεcand peak strain ε_p of ε_c=0.467 6ε_p.