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Effect of gamma-gamma prime mismatch, volume fraction gamma prime, and gamma prime morphology on elevated temperature properties of Ni, 20 Cr, 5.5 Mo, Ti, Al alloys

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Abstract

This study was designed to provide a critical test for the postulate that the mismatch between the lattices of austenite (γ) and the age-hardening gamma-prime (γ′) precipitates and the resultant coherency strains have a significant influence on the elevated temperature, particularly stress rupture, properties of a nickel-base superalloy. Two experimental alloys with a base analysis of Ni, 20 Cr, 5.5 Mo were designed with variable titanium and aluminum additions. To discern the effect of mismatch, an alloy without molybdenum was also experimented with. By manipulating the mismatch and volume fraction γ′ by heat treatment and chemistry, it was shown that a lower γ-γ′ mismatch indeed is beneficial to stress rupture life. Importance of volume fraction γ′ on this elevated temperature was also established.

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Authors and Affiliations

  1. Applied Physics Section, Research and Development Center, Carpenter Technology Corp., Reading, Pa

    Gunvant N. Maniar (Supervisor) & J. Edwin Bridge (Senior Research Physcist)

Authors
  1. Gunvant N. Maniar
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  2. J. Edwin Bridge
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Maniar, G.N., Bridge, J.E. Effect of gamma-gamma prime mismatch, volume fraction gamma prime, and gamma prime morphology on elevated temperature properties of Ni, 20 Cr, 5.5 Mo, Ti, Al alloys. Metall Trans 2, 95–102 (1971). https://doi.org/10.1007/BF02662642

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  • DOI: https://doi.org/10.1007/BF02662642

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