Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96

Wang, H.M.; Zhang, J.; Shang, Hulan; Sha, Aimin; Cheng, Yangyang; Duan, Huiling

doi:10.3390/ma16103874

Cited by 5 publications

(2 citation statements)

References 38 publications

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“…Compared with the first-generation powder metallurgy superalloy, the FGH96 superalloy appropriately reduces the strength level of the alloy, improves crack growth resistance and creep resistance, has a higher yield strength, and has excellent high temperature damage tolerance characteristics. As the current preferred material for aero-engine hot-end components, the FGH96 superalloy is now widely used in aero-engine turbine disks [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study on High-Temperature Low-Cycle Fatigue Behavior of the FGH96 Superalloy Based on Internal Stress Division

Li,

Qin,

et al. 2023

Metals

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In order to deeply explore the high-temperature cyclic characteristics of the FGH96 superalloy under different strain amplitudes, the high-temperature low-cycle fatigue behavior of the FGH96 superalloy was analyzed from the perspective of internal stress evolution. Four sets of strain amplitude (0.5%, 0.6%, 0.8%, and 1.2%) controlled high-temperature low-cycle fatigue tests were carried out on the FGH96 superalloy at 550 °C, and the internal stress was divided into back stress and effective stress through the cyclic stress-strain curves. The results show that the cyclic softening/hardening characteristics of the FGH96 superalloy under different strain amplitudes are closely related to the evolution of internal stress. The strain amplitude has a significant effect on the back stress of the FGH96 superalloy but has little effect on effective stress. At low strain amplitudes (0.5% and 0.6%), the back stress evolution rate of the FGH96 superalloy is lower than effective stress, and the material mainly exhibits cyclic softening. At high strain amplitudes (0.8% and 1.2%), the back stress evolution rate of the FGH96 superalloy is significantly higher than effective stress, and the material exhibits cyclic hardening. The combined effect of back stress and effective stress is the main reason for the different low-cycle fatigue behaviors of the FGH96 superalloy under different strain amplitudes.

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Section: Introductionmentioning

confidence: 99%

Study on High-Temperature Low-Cycle Fatigue Behavior of the FGH96 Superalloy Based on Internal Stress Division

Li,

Qin,

et al. 2023

Metals

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“…Li et al [11] analyzed the influence of molten salt hot corrosion on the high-temperature and LCF behaviors of the Materials 2023, 16, 5883 2 of 13 FGH96 superalloy through experiments. Wang et al [12] established a steady-state creep rate model for the FGH96 superalloy through creep experiments after pre-stretching it at room temperature. Shi et al [13,14] artificially introduced defects on smooth samples of FGH96 superalloy and studied the effect of surface defects on the fatigue life of the FGH96 superalloy.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of the FGH96 Superalloy under High-Temperature Cyclic Loading

Li,

Qin,

et al. 2023

Materials

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Strain-controlled low-cycle fatigue (LCF) tests and stress-controlled creep-fatigue interaction (CFI) tests on the FGH96 superalloy were carried out at 550 °C to obtain the cyclic softening/hardening characteristics at different strain amplitudes and ratcheting strain characteristics under different hold time. The failure mechanism of the FGH96 superalloy under different loading conditions was analyzed through fracture observations. The results show that the FGH96 superalloy exhibits different cyclic softening/hardening characteristics at different strain amplitudes, and the introduction of the hold time at peak stress exacerbates the ratcheting strain of the FGH96 superalloy under asymmetric stress cycles. Fracture observations show that the magnitude of the strain amplitude, high-temperature oxidation, and the introduction of the hold time will affect the mechanical properties of the FGH96 superalloy and change its fracture mode.

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Flash Sintering of Bimetallic Assemblies for Turbine Disks in Next‐Generation Jet Engines

Saly,

Villechaise,

Sallot

et al. 2024

Adv Eng Mater

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René 77 and another advanced powder metallurgy nickel‐based superalloy are flash‐sintered and joined to produce a dual‐alloy assembly. This innovative process allows for the sintering of powders to achieve high relative densities or the formation of solid joints in a shorter time than is feasible with conventional diffusion bonding techniques. Examination of the microstructure after heat treatments reveals that diffusion and recrystallization phenomena can modulate the transition zone. The creep properties of both alloys, evaluated using stress relaxation tests, do not seem to differ by more than an order of magnitude, while the higher thermal stability of René 77 compared to Alloy B at 800 °C tips the scales. In tension, base materials show very high properties, while bimetallic specimens exhibit at least higher properties than René 77. However, failure occurs at the bond at high temperatures due to the formation of an oxide film during the bonding process. These encouraging results illustrate the potential and constraints of the flash‐sintering process for producing dissimilar assemblies, which may enhance the properties of next‐generation aero‐engine turbine disks.

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Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96

Cited by 5 publications

References 38 publications

Study on High-Temperature Low-Cycle Fatigue Behavior of the FGH96 Superalloy Based on Internal Stress Division

Study on High-Temperature Low-Cycle Fatigue Behavior of the FGH96 Superalloy Based on Internal Stress Division

Fatigue Behavior of the FGH96 Superalloy under High-Temperature Cyclic Loading

Flash Sintering of Bimetallic Assemblies for Turbine Disks in Next‐Generation Jet Engines

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