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Heat treatment of 706 alloy for optimum 1200 °F stress-rupture properties

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Abstract

Evaluation of a commercial heat treatment for 706 alloy indicated that it resulted in relatively low 1200° F stress rupture ductility. It was determined that this was caused by a solution treatment which dissolved all of the age-hardening phases in the alloy and caused a coarse grain size and supersaturated matrix condition. Based upon extensive fine structure study of the 706 alloy as well as previous experience with 718 alloy and other Fe−Ni-base superalloys, a heat treatment is developed which effectively optimizes the 1200°F stress-rupture properties of the alloy. The key to best properties was found to be the precipitation of globular to plate-like Ni3Cb/Ni3Ti at the grain boundaries in conjunction with maintaining a fine as-forged grain structure.

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References

  1. J. H. Moll, G. N. Maniar and D. R. Muzyka:Met. Trans., 1971, vol. 2, pp. 2143–51.

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Authors and Affiliations

  1. Colt Industries, Crucible Materials Research Center, Pittsburgh, Pa.

    John H. Moll

  2. Research and Development Center, Carpenter Technology Corporation, Reading, Pa.

    Gunvant N. Maniar & Donald R. Muzyka

Authors
  1. John H. Moll
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  2. Gunvant N. Maniar
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  3. Donald R. Muzyka
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Additional information

J. H. MOLL, formerly with the Carpenter Technology Corporation, Research and Development Center is now

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Moll, J.H., Maniar, G.N. & Muzyka, D.R. Heat treatment of 706 alloy for optimum 1200 °F stress-rupture properties. Metall Trans 2, 2153–2160 (1971). https://doi.org/10.1007/BF02917544

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  • DOI: https://doi.org/10.1007/BF02917544

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