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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]
Copyright of JOM: The Journal of The Minerals, Metals & Materials Society (TMS) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 193654183
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PubTypeId: academicJournal
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  Data: Dissolution Behavior and Kinetic of (γ + γ′) Eutectic Microstructure in Hard-to-Deform Ni-Base Superalloy.
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  Label: Abstract
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of JOM: The Journal of The Minerals, Metals & Materials Society (TMS) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11837-026-08215-7
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        Text: English
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        StartPage: 5451
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      – SubjectFull: Eutectic structure
        Type: general
      – SubjectFull: Chemical dissolution kinetics
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      – SubjectFull: Temperature effect
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      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Avrami equation
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      – SubjectFull: Heat treatment
        Type: general
      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Heat resistant alloys
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    Titles:
      – TitleFull: Dissolution Behavior and Kinetic of (γ + γ′) Eutectic Microstructure in Hard-to-Deform Ni-Base Superalloy.
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            NameFull: Zhong, Jia
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            NameFull: Jiang, He
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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