TA2纯钛热压缩过程中形变对相变与再结晶的影响

Effect of deformation on phase change and recrystallization during the thermal compression of TA2 pure titanium

摘要:

使用Gleeble-1500热力学模拟实验机对纯钛在相变点前后进行热压缩变形,研究热压缩对相变的影响。研究发现应力作用在相变点附近时,相变首先发生在板条之间,新形成的β晶粒多为球状或短棒状。随着压缩量的增大,相邻的β晶核逐渐连接并变为条状组织。相变存在临界值,当压缩温度分别为860℃、890℃和920℃时,压缩量达到40%、30%和20%时,相变趋于饱和,取而代之的是动态再结晶的大量发生。温度越高,形变促进相变的现象就越明显,当压缩温度在相变点之后时,很小的压缩量就可以使相变大量发生。

Abstract:

Gleeble-1500 thermodynamic simulation machine was used to perform thermal compression deformation of pure titanium before and after the phase change point, and the influence of thermal compression on the phase transition was studied. It is found that when the stress is applied near the phase change point, the phase transition first occurs between the slats, and the newly formed β grains are mostly spherical or short rod-shaped. As the amount of compression increases, adjacent β nuclei gradually connect and become strip-like tissues. There is a critical value for phase transition, when the compression temperature is 860 °C, 890 °C and 920 °C, respectively, when the compression amount reaches 40%, 30% and 20%, the phase transition tends to saturate, replaced by a large number of dynamic recrystallization. The higher the temperature, the more obvious the phenomenon of deformation promoting phase change, when the compression temperature is after the phase change point, a small amount of compression can make a large number of phase transitions occur.