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Title
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Dynamic coarsening/dissolution kinetics models for γ' phases in a hot extruded FGH4113A alloy during hot deformation
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Type
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JournalPaper
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Keywords
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P/M superalloy, Hot deformation, γ' phase, Spheroidization, Coarsening/dissolution kinetics
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Abstract
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The evolution of γ' phase during hot deformation has a substantial impact on the microstructures and mechanical properties of nickel-based superalloys. Accurate prediction of γ' phase content can guide process optimization and industrial production. In this study, hot compression experiments are conducted on a hot extruded FGH4113A alloy at different strain (0.22–0.92), strain rates (1–0.001 s−1), and deformation temperatures (1050–1140 ℃). The dynamic coarsening/dissolution behaviors of γ' phases in a hot extruded FGH4113A alloy during hot deformation are investigated. It is found that the deformation conditions significantly affect the morphology and distribution characteristics of the γ' phase. As the strain increases, the secondary γ' phase (γ's) gradually dissolves, while the primary γ' phase (γ'p) undergoes coarsening. An increase in deformation temperature or a decrease in strain rate promotes the dissolution of the γ's phase and inhibit the coarsening of the γ'p phase. The coarsening of the γ'p phase involves a competition between dissolution and precipitation, rather than a single precipitation process. The splitting and spheroidization mechanisms of the γ'p phase are also investigated. Based on the evolution behavior and dissolution mechanisms of γ' phases, the dynamic coarsening/dissolution kinetics models are developed for the γ' phases.
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Researchers
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Majid Naseri (Not In First Six Researchers), Chao Wang (Not In First Six Researchers), Jin Yang (Not In First Six Researchers), Jian-Zheng Guo (Not In First Six Researchers), Yan-Cheng Feng (Fifth Researcher), Shu-Xin Li (Fourth Researcher), Zi-Jian Chen (Third Researcher), Yong-Cheng Lin (Second Researcher), Jun-Cheng Zhu (First Researcher)
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