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Pre-oxidation corrosion on very high cycle fatigue of GH4169 at 650 °C: Transition of crack initiation and life improvement
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DOI：10.1016/j.corsci.2026.114173.png)
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Abstract
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• Pre-oxidation significantly enhances the VHCF life of GH4169 at 650 °C. • Surface FGA formation indicates a vacuum-like effect of the oxide scale. • Crack initiation shifts from NbC inclusions to internal/surface Nb-rich oxides. • γ′/γ″ and δ phases impede dislocation motion and delay fatigue damage. • Oxide-induced crack closure and δ phases jointly retard crack growth.
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8.5
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