As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloy
In this paper, the as-cast microstructure, microsegregation, and the kinetics of (γ+γ′) eutectic phase and Laves phase dissolution in GH4151 alloy were studied by the optical microscope (OM), scanning electron microscope (SEM), electron probe microanalysis (EPMA), differential scanning calorimetry (...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423001515 |
| _version_ | 1797858828217221120 |
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| author | Lei Jia Heng Cui Shufeng Yang Shaomin Lv Xingfei Xie Jinglong Qu |
| author_facet | Lei Jia Heng Cui Shufeng Yang Shaomin Lv Xingfei Xie Jinglong Qu |
| author_sort | Lei Jia |
| collection | DOAJ |
| description | In this paper, the as-cast microstructure, microsegregation, and the kinetics of (γ+γ′) eutectic phase and Laves phase dissolution in GH4151 alloy were studied by the optical microscope (OM), scanning electron microscope (SEM), electron probe microanalysis (EPMA), differential scanning calorimetry (DSC), and high-temperature water quenching text. The results show that W and Al elements are segregated into the dendrites arm, while Mo, Nb, and Ti are segregated into the interdendritic region. The initial melting point temperature of the MB2 phase was near 1100 °C, the redissolution temperature range of γ′ phase is 1130–1160 °C, the obvious dissolution temperature of Laves phase was above 1145 °C and the γ + γ′ eutectic phase was redissolved obviously above 1165 °C. Based on the JMAK analysis, the activation energies of dissolution of Laves phase (266.3 kJ/mol) and γ+γ′ phase (279.5 kJ/mol) are close to the activation energy for the diffusion of Mo in Ni (288.15 kJ/mol) and Ti in Ni (288.15 kJ/mol), respectively. The back-diffusion of Mo and Ti into austenite is controlling the micro-mechanism for the dissolution of Laves phase and (γ+γ′) eutectic phase, respectively. |
| first_indexed | 2024-04-09T21:19:40Z |
| format | Article |
| id | doaj.art-9763832b779b46f1bfd8b52ddc10d4d0 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-09T21:19:40Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-9763832b779b46f1bfd8b52ddc10d4d02023-03-28T06:46:23ZengElsevierJournal of Materials Research and Technology2238-78542023-03-012353685381As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloyLei Jia0Heng Cui1Shufeng Yang2Shaomin Lv3Xingfei Xie4Jinglong Qu5Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author.State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author.Beijing GAONA Materials & Technology Co., Ltd., Beijing, 100081, China; High-Temperature Materials Institute, Central Iron and Steel Research Institute, Beijing, 100081, ChinaBeijing GAONA Materials & Technology Co., Ltd., Beijing, 100081, China; High-Temperature Materials Institute, Central Iron and Steel Research Institute, Beijing, 100081, ChinaBeijing GAONA Materials & Technology Co., Ltd., Beijing, 100081, China; High-Temperature Materials Institute, Central Iron and Steel Research Institute, Beijing, 100081, ChinaIn this paper, the as-cast microstructure, microsegregation, and the kinetics of (γ+γ′) eutectic phase and Laves phase dissolution in GH4151 alloy were studied by the optical microscope (OM), scanning electron microscope (SEM), electron probe microanalysis (EPMA), differential scanning calorimetry (DSC), and high-temperature water quenching text. The results show that W and Al elements are segregated into the dendrites arm, while Mo, Nb, and Ti are segregated into the interdendritic region. The initial melting point temperature of the MB2 phase was near 1100 °C, the redissolution temperature range of γ′ phase is 1130–1160 °C, the obvious dissolution temperature of Laves phase was above 1145 °C and the γ + γ′ eutectic phase was redissolved obviously above 1165 °C. Based on the JMAK analysis, the activation energies of dissolution of Laves phase (266.3 kJ/mol) and γ+γ′ phase (279.5 kJ/mol) are close to the activation energy for the diffusion of Mo in Ni (288.15 kJ/mol) and Ti in Ni (288.15 kJ/mol), respectively. The back-diffusion of Mo and Ti into austenite is controlling the micro-mechanism for the dissolution of Laves phase and (γ+γ′) eutectic phase, respectively.http://www.sciencedirect.com/science/article/pii/S2238785423001515Ni-based superalloyMicrostructure and microsegregationResidual segregation indexDiffusion coefficientActivation energy |
| spellingShingle | Lei Jia Heng Cui Shufeng Yang Shaomin Lv Xingfei Xie Jinglong Qu As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloy Journal of Materials Research and Technology Ni-based superalloy Microstructure and microsegregation Residual segregation index Diffusion coefficient Activation energy |
| title | As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloy |
| title_full | As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloy |
| title_fullStr | As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloy |
| title_full_unstemmed | As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloy |
| title_short | As-cast microstructure and homogenization kinetics of a typical hard-to-deform Ni-base superalloy |
| title_sort | as cast microstructure and homogenization kinetics of a typical hard to deform ni base superalloy |
| topic | Ni-based superalloy Microstructure and microsegregation Residual segregation index Diffusion coefficient Activation energy |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423001515 |
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