718Plus合金η相析出行为及其对热变形行为影响研究

Study on Precipitation Behavior of η Phase and the effect on Hot Derformation in 718Plus alloy

摘要:

研究了718Plus合金中η相的析出行为及溶解规律。研究了无η相析出、少量η相析出、大量η相析出的试样经不同压缩量压缩后的再结晶组织。研究了少量η相析出的试样在不同条件下压缩后的再结晶组织。结果表明， 718Plus合金中?相析出峰值温度在900℃。?相溶解受时间影响较大，在1040℃固溶2小时后?相可完全溶解。预先析出少量?相在大变形过程中有利于动态再结晶的发生，而大量析出?相在大变形过程中抑制动态再结晶的发生。在大变形量、合适的温度、合适的变形速率下，预先析出的少量?相与动态再结晶过程相互作用，有利于获得均匀、细小的晶粒组织。

Abstract:

The precipitation behavior and dissolution behavior of η-phase of 718Plus alloy are studied. By the thermal compression with different compression amount, the effect of different quantities of η-phase on the recrystallization was studied. Recrystallization behaviors of samples with little η-phase compressed at different conditions were studied. The results show that, the peak temperature of η-phase precipitation occurred at 900℃. The dissolve behavior of η-phase was mainly effected by solution time, and it dissolve effectively after 2 hours at temperature of 1040℃. Small quantity of η-phase contributes to dynamic recrystallization in large deformation process while large quantity of η-phase restrain dynamic recrystallization. At appropriate deformation temperature and rate, small quantity of η-phase interacted with the dynamic recrystallization process, which makes for the uniform fine crystal structure.