镍基粉末高温合金FGH4096中γ′相完全溶解温度的测定

通过JmatPro软件测试了镍基粉末高温合金FGH4096平衡相图,并根据γ′相平衡态溶解温度采用OM和SEM等方法研究了不同固溶温度下的γ′相溶解结果。结果表明,热力学软件JmatPro计算的FGH4096合金中的γ′相在930~1100 ℃大量溶解,完全溶解温度在1100 ℃以上。从1110 ℃到1130 ℃晶粒尺寸从16.1 μm长大至18.2 μm,变化不明显,从1130 ℃到1160 ℃,晶粒迅速从18.2 μm长大到28.6 μm。镍基粉末高温合金FGH4096中的γ′相起到强化作用的同时,对晶粒长大具有阻碍作用,随着固溶温度从1110 ℃升至1130 ℃,γ′相含量减少,其对晶粒的钉扎作用降低,导致晶粒有所长大。1130 ℃以上时,γ′相完全溶解,γ′相钉扎作用消失,晶粒迅速长大。最终确定FGH4096合金中γ′相实际的完全溶解温度为1130~1140 ℃。

Measurement of complete dissolution temperature of γ′phase in nickel-based P/M superalloy FGH4096

Equilibrium phase diagram of the nickel-based P/M superalloy FGH4096 was tested by JmatPro software, and the γ′ phase dissolution results at different solid solution temperatures were studied by using OM and SEM methods according to the γ′ phase equilibrium dissolution temperature. The results show that the γ′ phase in the FGH4096 alloy calculated by the thermodynamic software JmatPro is dissolved in a large amount between 930-1100 ℃, and the complete dissolution temperature is above 1100 ℃. From 1110 ℃ to 1130 ℃, the grain size increases from 16.1 μm to 18.2 μm, and the change is not obvious, but from 1130 ℃ to 1160 ℃, the grain size quickly increases from 18.2 μm to 28.6 μm. While the γ′ phase in the nickel-based P/M superalloy FGH4096 plays a strengthening role, it also hinders the growth of grains. As the solid solution temperature increases from 1110 ℃ to 1130 ℃, the content of the γ′ phase decreases. The pinning effect is reduced, resulting in grain growth. Above 1130 ℃, the γ′ phase is completely dissolved, the pinning effect of the γ′ phase disappears, and the grains grow rapidly. Finally, it is determined that the actual complete dissolution temperature of γ′ phase in the FGH4096 alloy is between 1130-1140 ℃.