High temperature deformation behavior and microstructure evolution of wrought nickel-based superalloy GH4037 in solid and semi-solid states |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;1. National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing 100081, China;2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;3. High Temperature Materials Research Institute, Central South University, Changsha 410083, China;4. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China;5. Light Alloy Research Institute, Central South University, Changsha 410083, China;6. Yuanmeng Precision Technology (Shenzhen) Institute, Shenzhen, China;1. Dept. of Materials Engineering, The University of British Columbia, Vancouver, Canada;2. Dept. of Materials Science and Engineering, McMaster University, Hamilton, Canada |
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| Abstract: | Cylindrical samples of Ni-based GH4037 alloy were compressed at solid temperatures (1200, 1250 and 1300 °C) and semi-solid temperatures (1340, 1350, 1360, 1370 and 1380 °C) with different strain rates of 0.01, 0.1 and 1 s−1. High temperature deformation behavior and microstructure evolution of GH4037 alloy were investigated. The results indicated that flow stress decreased rapidly at semi-solid temperatures compared to that at solid temperatures. Besides, the flow stress continued to increase after reaching the initial peak stress at semi-solid temperatures when the strain rate was 1 s−1. With increasing the deformation temperature, the size of initial solid grains and recrystallized grains increased. At semi-solid temperatures, the grains were equiaxed, and liquid phase existed at the grain boundaries and inside the grains. Discontinuous dynamic recrystallization (DDRX) characterized by grain boundary bulging was the main nucleation mechanism for GH4037 alloy. |
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| Keywords: | nickel-based superalloy high temperature deformation semi-solid microstructure evolution dynamic recrystallization |
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