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[Shi Chenyi,Zhang Maicang and Guo Jing.Recrystallization Mechanism of Typical Ni-based Super-alloys[J].Rare Metal Materials and Engineering,2023,52(1):63~73.]
Recrystallization Mechanism of Typical Ni-based Super-alloys
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Received:April 02, 2022  Revised:July 05, 2022
Key words: Ni-based superalloys  stepped grain boundaries  nucleation mechanism of recrystallization
Foundation item:National Natural Science Foundation of China (51971016); National Science and Technology Major Project of the Ministry of Science and Technology of China (2021YFB3700403)
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Shi Chenyi,Zhang Maicang and Guo Jing  
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      The dynamic and static recrystallization behavior of GH4760, GH4738, and AD730 typical Ni-based superalloys during hot deformation was investigated. The compressive hot deformation and solution annealing experiments were conducted. Results show that the nucleation mechanism of dynamic and static recrystallizations is dominated by the discontinuous mechanism of grain boundary bulging. Different types of stepped grain boundaries are generated during the dynamic and static recrystallizations due to the transformation from ordinary crystal planes into low-index crystal planes. This transformation results in lower energy of more grain boundaries. The morphology of the stepped boundaries on Σ3 grain boundaries mostly decompose into {111}1/{111}2 and 90°{112}1/{112}2 facets. The stepped grain boundaries promote the migration of grain boundaries, accelerating the recrystallization process. After recrystallization, partial stepped grain boundaries remain, the interfacial energy reduces, and the further grain growth is promoted.