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Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon, A. ; Cormier, J. ; Mauget, F. ; Hervier, Z. ; Nadot, Y.

Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2018-09, Vol.49 (9), p.3938-3950 [Periódico revisado por pares]

New York: Springer US

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Título:
Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature
Autor: Cervellon, A. ; Cormier, J. ; Mauget, F. ; Hervier, Z. ; Nadot, Y.
Assuntos: Acoustics ; Alloy development ; Automatic ; Biomechanics ; Characterization and Evaluation of Materials ; Chemical composition ; Chemical Sciences ; Chemistry and Materials Science ; Crack initiation ; Crack propagation ; Creep strength ; Crystal defects ; Directional solidification ; Electric power ; Electromagnetism ; Engineering Sciences ; Fatigue cracks ; Fatigue failure ; Fluid mechanics ; Fracture mechanics ; High cycle fatigue ; High temperature ; Hot isostatic pressing ; Material chemistry ; Materials and structures in mechanics ; Materials Science ; Mathematical Physics ; Mechanics ; Metallic Materials ; Microcracks ; Nanotechnology ; Nickel base alloys ; Oxidation ; Oxidation resistance ; Physics ; Polymers ; Porosity ; Propagation modes ; Quantum Physics ; Reactive fluid environment ; Single crystals ; Stress concentration ; Stress propagation ; Structural Materials ; Superalloys ; Surfaces and Interfaces ; Thermics ; Thin Films ; Third European Symposium on Superalloys and Their Applications ; Topical Collection: Superalloys and Their Applications ; Vibrations
É parte de: Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2018-09, Vol.49 (9), p.3938-3950
Descrição: Very high cycle fatigue (VHCF) properties at high temperature of Ni-based single-crystal (SX) superalloys and of a directionally solidified (DS) superalloy have been investigated at 20 kHz and a temperature of 1000 °C. Under fully reversed conditions ( R = − 1), no noticeable difference in VHCF lifetimes between all investigated alloys has been observed. Internal casting pores size is the main VHCF lifetime-controlling factor whatever the chemical composition of the alloys. Other types of microstructural defects (eutectics, carbides), if present, may act as stress concentration sites when the number of cycles exceed 10 9 cycles or when porosity is absent by applying a prior hot isostatic pressing treatment. For longer tests (> 30 hours), oxidation also controls the main crack initiation sites leading to a mode I crack initiation from oxidized layer. Under such conditions, alloy’s resistance to oxidation has a prominent role in controlling the VHCF. When creep damage is present at high ratios ( R ≥ 0.8), creep resistance of SX/DS alloys governs VHCF lifetime. Under such high mean stress conditions, SX alloys developed to retard the initiation and creep propagation of mode I micro-cracks from pores have better VHCF lifetimes.
Editor: New York: Springer US
Idioma: Inglês

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Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon, A. ; Cormier, J. ; Mauget, F. ; Hervier, Z. ; Nadot, Y.

New York: Springer US

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