热工艺参数对TC17钛合金静态球化动力学的影响Effect of thermal processing parameters on static globularization kinetics of TC17 titanium alloy

对TC17合金在820和860 ℃下进行等温锻造，随后在相同温度下进行热处理10 min~8 h，利用定量金相法研究变形量、热处理温度等工艺参数对片状α相静态球化的影响规律。结果表明：随着变形量的增加，在随后热处理过程中片状α相更容易发生晶界分离而形成球化组织，球化速率明显提高。温度影响扩散过程，对静态球化有促进作用，且在应变较低时影响更为明显。在球化率随热处理时间增大的同时，球化速率逐渐减小至常值，JMAK方程可以用来描述TC17合金静态球化的规律。

The isothermal compression of TC17 alloy at 820 and 860 ℃, and subsequently annealing for 10 min-8 h were conducted, and the effects of deformation degree, annealing temperature and annealing time on static globularization of TC17 titanium alloy were investigated. The results show that the deformation degree greatly influences the boundary splitting, so that the static globularization kinetics of α phase increases with increasing deformation degrees. As a thermally activated process, the diffusivity of solutes is determined by annealing temperature. Thus, the static globularization can be accelerated by increasing the temperature, especially when the strain is low. Meanwhile, globularization ratio increases while static globularization kinetics decrease to a constant with increasing the annealing time. The JMAK equation can be used to describe the static globularization kinetics.

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