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Effect of iron addition on the precipitation behavior of CoNiCr alloys containing Nb

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Abstract

The effect of iron addition on the precipitation behavior of Co-Ni-Cr-Nb alloys is discussed. Iron addition changes the main precipitate from orthorhombic β-Ni3Nb (Ni3Cb) to BCTγ″-phase which is disc shaped and precipitates on {100} matrix planes. The growth ofγ″-precipitate follows the Lifshitz-Wagner theory of diffusion controlled growth. An attempt has been made to analyze the structure ofγ″ using the electronic considerations of the Engel-Brewer theory. On continued aging, metastableγ″ transforms to a stable β-phase on {111} matrix planes. The orientation relationship of this phase is similar to that observed in other alloys. In addition to intragranular precipitation, β=phase also precipitates at the grain boundaries and grows into the grains. The transformation ofγ″ into β-phase does not affect the hardness to any significant extent.

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Authors and Affiliations

  1. Metallurgical Sciences Laboratories, Department of Mechanical Engineering, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada

    M. C. Chaturvedi (Professor) & D. W. Chung (Research Associate)

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  1. M. C. Chaturvedi
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  2. D. W. Chung
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Chaturvedi, M.C., Chung, D.W. Effect of iron addition on the precipitation behavior of CoNiCr alloys containing Nb. Metall Trans A 10, 1579–1585 (1979). https://doi.org/10.1007/BF02811688

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