Rong Yi,Hou Weixue,Du Jinhui,et al.Effect of Solution Temperature on Static Recrystallization Behavior of High Quality GH4738 Alloy[J].Special Steel,2026,47(02):122-128.
Rong Yi,Hou Weixue,Du Jinhui,et al.Effect of Solution Temperature on Static Recrystallization Behavior of High Quality GH4738 Alloy[J].Special Steel,2026,47(02):122-128. DOI: 10.20057/j.1003-8620.2025-00133.
Effect of Solution Temperature on Static Recrystallization Behavior of High Quality GH4738 Alloy
The effects of different solid solution temperature on the recrystallization behavior of as-forged high-quality GH4 738 superalloy were investigated by optical microscopy, field emission scanning electron microscopy (FE-SEM) and mechanical property tests. The results indicate that complete static recrystallization occurs in the as-forged high-quality GH4 738 superalloy during solid solution treatment at 1 040 ℃. When the temperature is lower than 1 040 ℃, the grain size changes slightly, while grain coarsening and poor uniformity occur when the temperature exceeds 1 050 ℃. The primary γ′ phase not only pins grain boundaries to hinder grain boundary migration but also increases deformation stored energy to promote recrystallization. Therefore, solution treatment near the primary γ′ phase solid solution temperature (1 040 ℃) can induce complete static recrystallization and refine grains in high-quality GH4 738 alloy. However, when the holding time is too long (>4 h) or the solid solution temperature is too high (>1 050 ℃), a large amount of primary γ′ phase redissolves into the matrix, leading to rapid alloy grain growth. The alloy strength first increases and then decreases with the rise of solid solution temperature, and the high-temperature creep life of the alloy is significantly affected by the solid solution temperature.
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