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Grain growth in dispersion strengthened superalloys by moving zone heat treatments

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Abstract

The high temperature strength of dispersion strengthened materials is limited by grain boundary sliding and transverse boundary rupture. These effects are minimized through development of materials with elongated or fibrous grain structures. Thermomechanical processing and grain growth heat treatments are used to develop coarse elongated grain structures in dispersion strengthened nickel-base superalloys made from mechanically alloyed powder. Grain size and aspect ratio are increased by using a moving hot zone to accomplish grain growth. The application of this technique to extruded bar of two nickel-base superalloys, IN-853* (Alloy A) and a developmental alloy (Alloy B) with composition: 15Cr, 4.5A1, 2.5Ti, 2Ta, 3.5Mo, 4W, 0.l5Zr, 0.01B, 1.1Y2O3 is discussed, and the relation between grain aspect ratio and mechanical properties in these materials is presented.

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Authors and Affiliations

  1. Non Ferrous Group, The International Nickel Co. Inc., Sterling Forest, 10901, Suffern, N.Y.

    R. L. Cairns (Process Engineer), L. R. Curwick (Research Investigator) & J. S. Benjamin (Research Manager)

Authors
  1. R. L. Cairns
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  2. L. R. Curwick
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  3. J. S. Benjamin
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Additional information

This alloy is produced commercially by the Huntington Alloy Products Division of The International Nickel Company, Inc. as INCONELŗ alloy MA-753.

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Cairns, R.L., Curwick, L.R. & Benjamin, J.S. Grain growth in dispersion strengthened superalloys by moving zone heat treatments. Metall Trans A 6, 179–188 (1975). https://doi.org/10.1007/BF02673686

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  • DOI: https://doi.org/10.1007/BF02673686

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