Abstract
The effects of a uniform, internal concentration (1.74 at. pct) of hydrogen on the room-temperature tensile behavior of a single-crystal nickel-base superalloy, PWA 1480, have been studied. In particular, the interactive role of porosity and γ/γ′ eutectic on hydrogen embrittlement was examined. It was found that while there was no effect of porosity on tensile properties, hydrogen embrittled the γ/γ′ eutectic, leading to a lower strain to failure in specimens containing this constituent. Significant reduction in ductility also occurred in hydrogen-charged specimens where both porosity and γ/γ′ eutectic were effectively absent. These observations are correlated with the deformation structure and fractography and related to existing hydrogen embrittlement processes. Since hydrogen promoted planar slip and localized deformation, it is suggested that a hydrogen-enhanced localized plasticity mechanism is operating not only in PWA 1480 but likely in other single-crystal and polycrystal nickel-base superalloys.
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