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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Kočí, Jan | Prague |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Dandekar, Tushar
University of Portsmouth
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2024Microstructural damage assessment in alloy 617M near high cycle fatigue threshold at elevated temperaturecitations
- 2024Probing the temperature field and residual stress transformation in multi-track, multi-layered systemcitations
- 2024Enhancing Ni–Ti shape memory alloy difusion bonding with Ti/Ni reactive multilayer foilscitations
- 2024The corrosion mechanism of grey cast-iron yacht keel in marine environment during long-term exposure
- 2023Insights into the influence of cold rolling and accelerated isothermal aging on microstructure evolution, corrosion performance, σ precipitation and its kinetics in a low molybdenum Fe-21Cr-5Mn-1.5Ni alloycitations
- 2023Deciphering the effect of sea water on corrosion behavior of epoxy/graphite- flakes composite coated LDX 2101 stainless steelcitations
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article
Microstructural damage assessment in alloy 617M near high cycle fatigue threshold at elevated temperature
Abstract
<p>High cycle fatigue (HCF) behavior of Ni superalloy 617M is investigated at 973 K and R-ratio −1 on a resonance-based fatigue testing system at 85 Hz frequency. The alloy experiences an abrupt drop in fatigue life within a narrow domain of 2.5–5 MPa near its fatigue strength at 320 MPa. Electron microscopy and diffraction techniques were employed to thoroughly analyze the nominal fatigue damage. The characterization revealed the significance of precipitation of secondary phases M<sub>23</sub>C<sub>6</sub>, Ti (C, N), and γ′ phase in dictating the HCF strength of the alloy. Cyclic loading at high temperature causes γ-matrix hardening and secondary phase precipitation synergistically strengthening the material beyond its yield strength. Conjunctively, dynamic strain aging was also seen to play a major role in the evolution of fatigue damage. The work highlights the collective contribution of γ′-phase precipitation, carbides, and dynamic strain aging and their influence on the HCF behavior of alloy 617M.</p>