Abstract
The hydrogen embrittlement properties of some nickel based superalloys such as C-22, C-276, G-30 and Alloy 625 were studied. The alloys were studied for their susceptibility in annealed, cold worked and aged conditions. The degradation in mechanical properties were evaluated by slow strain rate testing. The hydrogen permeation parameters were deduced using thin foil specimens and electrochemical hydrogen charging according to Devanathan-Stacharsky. The fractographic evaluations were carried out using scanning electron microscopy. The alloys were rank ordered. Results indicate that all the alloys tested are susceptible to hydrogen embrittlement and that any strengthening heat treatment increases their susceptibility to hydrogen damage.
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1995
Association for Materials Protection and Performance (AMPP)
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