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Dissolution Behavior and Kinetic of (γ + γ′) Eutectic Microstructure in Hard-to-Deform Ni-Base Superalloy.

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Title: Dissolution Behavior and Kinetic of (γ + γ′) Eutectic Microstructure in Hard-to-Deform Ni-Base Superalloy.
Authors: Zhong, Jia1 (AUTHOR), Jiang, He1 (AUTHOR) jianghe17@sina.cn, Yao, Zhihao1 (AUTHOR), Dong, Jianxin1 (AUTHOR)
Source: JOM: The Journal of The Minerals, Metals & Materials Society (TMS). Jun2026, Vol. 78 Issue 6, p5451-5468. 18p.
Subjects: Eutectic structure, Chemical dissolution kinetics, Temperature effect, Microstructure, Avrami equation, Heat treatment, Mechanical behavior of materials, Heat resistant alloys
Abstract: The dissolution behavior and kinetics of the (γ + γ′) eutectic microstructure in ∍ κ 151 alloy were systematically studied. A Johnson–Mehl–Avrami–Kolmogorov model was established to predict the variation in the (γ + γ′) eutectic volume fraction during homogenization. The results show that the as-cast microstructure exhibits two distinct (γ + γ′) eutectic morphologies: sunflower-like and blocky. Homogenization treatments were conducted at 1080°C, 1110°C, 1140°C, 1150°C, and 1160°C for different durations to observe the dissolution process. The blocky (γ + γ′) eutectic dissolved much faster than the sunflower-like one. Complete dissolution of the blocky (γ + γ′) eutectic occurred at 1140°C/10 h, while the sunflower-like type required 1160°C/45 h. The dissolution process is mainly controlled by the diffusion of Ti. The dissolution of the sunflower-like eutectic is highly temperature-dependent. At 1150–1160°C, influenced by the elastic strain energy between the γ and eutectic γ′ phases, the eutectic γ′ phase underwent splitting, causing the sunflower-like eutectic to fragment into smaller blocks, which subsequently dissolved. The complete elimination of the (γ + γ′) eutectic microstructure significantly improves the mechanical properties of the alloy, providing a theoretical basis for optimizing the hot-working process of ∍ κ 151 alloy. [ABSTRACT FROM AUTHOR]
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Abstract:The dissolution behavior and kinetics of the (γ + γ′) eutectic microstructure in ∍ κ 151 alloy were systematically studied. A Johnson–Mehl–Avrami–Kolmogorov model was established to predict the variation in the (γ + γ′) eutectic volume fraction during homogenization. The results show that the as-cast microstructure exhibits two distinct (γ + γ′) eutectic morphologies: sunflower-like and blocky. Homogenization treatments were conducted at 1080°C, 1110°C, 1140°C, 1150°C, and 1160°C for different durations to observe the dissolution process. The blocky (γ + γ′) eutectic dissolved much faster than the sunflower-like one. Complete dissolution of the blocky (γ + γ′) eutectic occurred at 1140°C/10 h, while the sunflower-like type required 1160°C/45 h. The dissolution process is mainly controlled by the diffusion of Ti. The dissolution of the sunflower-like eutectic is highly temperature-dependent. At 1150–1160°C, influenced by the elastic strain energy between the γ and eutectic γ′ phases, the eutectic γ′ phase underwent splitting, causing the sunflower-like eutectic to fragment into smaller blocks, which subsequently dissolved. The complete elimination of the (γ + γ′) eutectic microstructure significantly improves the mechanical properties of the alloy, providing a theoretical basis for optimizing the hot-working process of ∍ κ 151 alloy. [ABSTRACT FROM AUTHOR]
ISSN:10474838
DOI:10.1007/s11837-026-08215-7