Effect of Incomplete Dynamic Recrystallization Microstructure on Mechanical Properties and Fracture Mechanism of Nickel-based Superalloy
WANG Miao1, LIU Yanhui1,2,3,*, LIU Zhaozhao1
1 School of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China 2 School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China 3 Zhejiang Wenzhou Research Institute of Light Industry, Wenzhou 325002, Zhejiang, China
Abstract: The isothermal deformation of hot isostatic pressed nickel-based superalloy FGH4096 was carried out at 1 080 ℃ and 3 s-1 strain rate, and the maximum deformation was 50%. The microstructure evolution of the alloy during high temperature deformation was studied, and the mechanical properties of the region with typical deformation microstructure were tested at 700 ℃ and 0.001 s-1. Meanwhile, the microstructure and fracture were analyzed by optical microscope (OM), scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). It is found that the recrystallization degree of the incomplete dynamic recrystallization structure decreases from the center to the edge of the sample section, and the tensile strength of the center region is 1 422.79 MPa, the yield strength is 1 110.3 MPa and the elongation is 10.15%. The nucleation of recrystallized grains first occurs at grain boundaries and the nucleation mode is mainly protruding grain boundaries. In the incomplete dynamic recrystallized structure, there are subgrain boundaries in the deformed grains, which hinder the dislocation movement and improve the strength of the alloy. The fracture morphology is a mixture of dimple and tearing edge, and the fracture mode is transgranular fracture.
王淼, 刘延辉, 刘昭昭. 镍基高温合金不完全动态再结晶组织对力学性能的影响及断裂机制[J]. 材料导报, 2024, 38(6): 21120034-5.
WANG Miao, LIU Yanhui, LIU Zhaozhao. Effect of Incomplete Dynamic Recrystallization Microstructure on Mechanical Properties and Fracture Mechanism of Nickel-based Superalloy. Materials Reports, 2024, 38(6): 21120034-5.
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2024, Vol. 38 
