Hydrogen embrittlement assessment of alloy 718 with precipitate variations
Hydrogen embrittlement of Ni-base corrosion resistant alloys (CRAs) can occur when components under stress are exposed to hydrogen in deep sea oil wells. Ni-base CRAs, such as alloy 718, are primarily strengthened by precipitation of γ” and γ’, and the effect of these precipitates on hydrogen embrittlement is not well understood. To better understand hydrogen embrittlement of γ” and γ’ strengthened Ni base CRAs, the hydrogen embrittlement susceptibilities and fracture modes of alloy 718 microstructures with variations in the γ” and γ’ precipitates and without grain boundary δ phase were evaluated ...
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