Creep-Fatigue Interaction Behaviors and Microstructure Evolution of Ni-based Superalloy 617

doi:10.3901/JME.2022.08.170

Abstract

Abstract: Creep-fatigue test strain-controlled with different tensile strain holding times at 725℃ were done on Nickel-based superalloy 617 as a typical candidate material for turbine rotor using an advanced ultra super critical power plant. The mechanical behavior and microstructure evolution under 4 strain holding times were compared and analyzed. The results show that creep-fatigue failure mechanism under short-time strain holding is intergranular failure caused by the connection of fatigue cracks and oxidized cavities and oxidized grain boundaries. As the strain holding time increases,the grain boundary oxidation resistance and the intergranular and intragranular strength increase,and the ability to resist creep and crack propagation increases.The number of 617 creep-fatigue failure cycles decreases while the total running time increases. The crack morphology,microstructure defects,the evolution of carbides and precipitated phases and the formation mechanisms of different γ' phases were discussed. It revealed the influence mechanism between creep-fatigue interactive mechanical behavior and microstructure evolution of 617 Nickel-based alloy,which provides reference for the selection and use of high-temperature components of A-USC turbine units.

Key words: creep-fatigue interaction, microstructures, γ' phase evolution, Nickel-based superalloy, A-USC power plant

CLC Number:

TG113

WU Haili, ZHANG Changchun, SUN Lingen, XU Qianhong. Creep-Fatigue Interaction Behaviors and Microstructure Evolution of Ni-based Superalloy 617[J]. Journal of Mechanical Engineering, 2022, 58(8): 170-180.

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