熱工藝參數(shù)對TC17鈦合金靜態(tài)球化動力學(xué)的影響Effect of thermal processing parameters on static globularization kinetics of TC17 titanium alloy

對TC17合金在820和860 ℃下進(jìn)行等溫鍛造，隨后在相同溫度下進(jìn)行熱處理10 min~8 h，利用定量金相法研究變形量、熱處理溫度等工藝參數(shù)對片狀α相靜態(tài)球化的影響規(guī)律。結(jié)果表明：隨著變形量的增加，在隨后熱處理過程中片狀α相更容易發(fā)生晶界分離而形成球化組織，球化速率明顯提高。溫度影響擴(kuò)散過程，對靜態(tài)球化有促進(jìn)作用，且在應(yīng)變較低時影響更為明顯。在球化率隨熱處理時間增大的同時，球化速率逐漸減小至常值，JMAK方程可以用來描述TC17合金靜態(tài)球化的規(guī)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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