Creep Behavior of FGH96 Superalloy at Different Service Conditions
Received date: 2021-05-17
Revised date: 2021-09-03
Online published: 2021-11-26
The FGH96 superalloy is extensively used as a gas turbine disk under high temperature due to its excellent tensile and creep properties. With recent developments in the aviation industry, the velocity of the aircraft has increased significantly, thereby increasing the temperature and stress on the turbine disk materials during their service. Therefore, creep deformation is crucial in the turbine disk superalloy. In this study, the creep characteristics of FGH96 superalloy were systematically studied at 650-750oC and 690-810 MPa and the creep mechanism of the alloy under different service conditions was investigated via SEM, EBSD, and TEM. For the creep temperature of 704oC, the creep properties of the alloy decreased with the increase in stress level. When the applied loading stress was 690 MPa, the creep properties of FGH96 alloy decreased significantly with the increase in temperature, and its steady-state creep strain rate was more sensitive to the service temperature. Further, every 30oC increase in the service temperature increased the creep rate by an order of magnitude. For the temperature in the range 650-750oC and the applied loading stress in the range 690-810 MPa, the creep deformation of the alloy was dominated by dislocation slip and resulted in various micro-twins on the continuous (
Key words： FGH96 superalloy; creep mechanism; service condition; fracture feature
Zichao PENG , Peiyuan LIU , Xuqing WANG , Xuejun LUO , Jian LIU , Jinwen ZOU . Creep Behavior of FGH96 Superalloy at Different Service Conditions[J]. Acta Metall Sin, 2022 , 58(5) : 673 -682 . DOI: 10.11900/0412.1961.2021.00207
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