Ti600钛合金置氢后激活能及热塑性研究

Active Energy and Thermal Plasticity of Hydrogenated Ti600 Titanium

采用热模拟实验方法,研究了Ti600钛合金置氢后的热塑性性能,确定了不同含氢量及工艺参数条件下的激活能。研究结果发现,氢含量对置氢Ti600钛合金的峰值应力具有明显影响,当氢含量小于0.2%(质量分数)时,由于此时氢元素对β相的稳定起主导作用,因此随氢含量的增加,峰值应力随之降低。当氢含量大于0.2%(质量分数)时,由于此时氢元素的固溶强化起主导作用,因此随氢含量的增加,峰值应力随之增加。在相同塑性性能的条件下,提高氢含量,可以降低Ti600钛合金的变形温度。根据热模拟实验数据,得到了Ti600钛合金在不同氢含量时的激活能及相关系数,确定了置氢Ti600钛合金的Arrhenius型本构方程。

The thermal deformation performance of hydrogenated Ti600 titanium alloy was studied with thermal simulation. Active energy was determined at different hydrogen content and process parameters. Results showed that hydrogen content had important influence on peak stress of hydrogenated Ti600 titanium alloy. When hydrogen content was less than 0.2%, the peak stress reduced with the increase of hydrogen content, because hydrogen played a main role on stabilization of 13 phase. When hydrogen content was bigger than 0.2%, the peak stress increased with the increase of hydrogen content, because hydrogen played a main role of strengthening. Under the same condition of plastic performance requirement, the deformation temperature reduced with the increase of hydrogen content. According to the data of thermal simulation, active energy and coefficients of constitutive model were determined for different hydrogen content. Constitutive model of stressstrain was given by Arrhenius equation for hydrogenated Ti600 titanium alloy.