Effect of heat treatment on microstructure and hardness of GH4169 alloy

doi:10.13251/j.issn.0254-6051.2023.07.033

Abstract

Abstract: Effects of different solid solution and aging processes on microstructure and hardness of GH169 alloy were studied. The results show that when the solution treatment temperature is in the range of 900-1000 ℃, the microstructure of the GH4169 alloy has no obvious change, and the hardness decreases slightly with the solution treatment temperature rising. When the solution temperature is above 1050 ℃, with the increase of solution temperature and time, the recrystallized grains grow rapidly and the hardness decreases significantly. After solution treated at 1100 ℃ for 45 min, the recrystallization is completed and the hardness is basically unchanged. The aging temperature and time have significant influence on the precipitation of strengthening phases in the GH4169 alloy, which is manifested as the significant difference in hardness. The hardness of the GH4169 alloy reaches the highest after aging at 720 ℃ for 16 h.

Key words: GH4169 alloy, solution treatment, aging, microstructure, hardness

CLC Number:

TG156.92

Zan Bin, Wang Qi, Xu Ning, Wang Xu, Wu Dali. Effect of heat treatment on microstructure and hardness of GH4169 alloy[J]. Heat Treatment of Metals, 2023, 48(7): 193-196.

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