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研究GH720Li合金γ’相回溶过程并模拟Al+Ti含量以及Ti/Al比对γ’相后续冷却析出的影响。γ’相的冷却析出与γ’相回溶及回溶后Al、Ti元素的扩散动力学过程有关。保温时间延长与固溶温度升高使γ’冷却析出相尺寸减小;不同冷速下,γ’析出相尺寸、形状与分布不同。TTT与CCT曲线中,随着Al+Ti含量的增加,不同冷速下的γ’相析出温度升高且相对应的析出时间提前。水冷乃至冷却速率高达1000℃/min时,无法抑制γ’相冷却析出。Ti/Al比的变化对γ’相的析出基本无影响。
The effect of γ ’phase remelting process on the GH720Li alloy and simulating the Al + Ti content and Ti / Al ratio on the subsequent cooling precipitation of γ’ phase was studied. The cooling precipitation of γ ’phase is related to the kinetics of the diffusion of γ’ phase and the diffusion kinetics of Al and Ti elements after the solution is dissolved. The longer the holding time and the higher the solid solution temperature, the smaller the size of γ ’precipitates is. The size, shape and distribution of γ’ precipitates are different under different cooling rates. In the TTT and CCT curves, with the increase of Al + Ti content, the precipitation temperature of γ ’phase increases at different cooling rates and the corresponding precipitation time advances. Water cooling and even cooling rate as high as 1000 ℃ / min, can not suppress the γ ’phase cooling precipitation. The change of Ti / Al ratio has no effect on the precipitation of γ ’phase.