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Microstructure and hydrogen performance of alloy 903

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Abstract

Transmission electron microscopy has been used to determine that the strengthening precipitate in Incoloy 903 is γ′ (Ni3 (Al, Ti)), with no evidence of γ″ (NixNb), although the latter has been reported. In addition, the alloy does not undergo a martensitic transformation when quenched to 4 K in the solution treated or aged conditions. Aged tensile specimens charged with 1200 at. ppm of hydrogen exhibited ductility losses when compared to uncharged specimens. The hydrogen-charged specimens failed in a ductile manner, the fracture being characterized by a finer dimple size than observed in uncharged specimens. The ductility loss is shown to be a function of the dimple size reduction (expressed as the ratio of dimple size with hydrogen to that without hydrogen) and can be explained in terms of accelerated dimple nucleation due to hydrogen accumulation at precipitate particles.

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Authors and Affiliations

  1. Science Center, Rockwell International, 91360, Thousand Oaks, CA

    Cecil G. Rhodes (Senior Staff Associate) & Anthony W. Thompson (Member of Technical Staff)

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  1. Cecil G. Rhodes
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  2. Anthony W. Thompson
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Rhodes, C.G., Thompson, A.W. Microstructure and hydrogen performance of alloy 903. Metall Trans A 8, 949–954 (1977). https://doi.org/10.1007/BF02661578

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  • DOI: https://doi.org/10.1007/BF02661578

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