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采用Gleeble高温压缩实验研究了变形条件对GH625合金高温变形动态再结晶的影响,结果表明:当变形程度较小时,原始晶粒内部出现大量孪晶,晶界呈现锯齿状凸出;随变形程度的增加,在晶界弓出部位开始形核,形成大量再结晶晶粒,随变形程度进一步增加,GH625合金动态再结晶体积分数增大,但是再结晶晶粒尺寸无明显变化;GH625合金动态再结晶是一个受变形温度和应变速率控制的过程,变形温度越高,动态再结晶越容易形核,应变速率越小,动态再结晶过程进行得越充分。在低应变速率条件下,GH625合金获得完全动态再结晶组织的温度随变形速率的升高而升高,而在高应变速率条件下必须考虑变形热效应对合金变形组织的影响。
The effect of deformation conditions on the dynamic recrystallization of high temperature deformation of GH625 alloy was studied by Gleeble high temperature compression test. The results show that when the degree of deformation is small, a large number of twins appear inside the original grain and the grain boundaries appear jagged. , The nuclei began to nucleate at the outcrop of the grain boundary to form a large number of recrystallized grains, which increased with the degree of deformation. The dynamic recrystallization volume fraction of GH625 alloy increased but the recrystallized grain size did not change significantly. The dynamic recrystallization of GH625 alloy Is a process controlled by the deformation temperature and strain rate. The higher the deformation temperature, the easier nucleation of dynamic recrystallization. The smaller the strain rate, the more dynamic recrystallization proceeds. Under low strain rate conditions, the temperature of fully dynamic recrystallized microstructure of GH625 alloy increases with the increase of deformation rate, but the effect of deformation heat effect on deformation structure of alloy must be considered under high strain rate.