Abstract
Two oxide dispersion strengthening (ODS) nickel-base superalloys, a solely dispersion-strengthened alloy (PM 1000) and an additionally γ′-strengthened alloy (PM 3030) are investigated regarding creep resistance at temperatures between 600 °C and 1000 °C. The creep strength advantage of PM 3030 over PM 1000 decreases as the temperature increases due to the thermal instability of the γ′ phase. The particle strengthening contribution in both alloys increases linearly with load. However, solid solution softening leads to an apparent drop in particle strengthening in PM 1000. Deformation concentration in slip bands is more accentuated in PM 3030-R34 due to additional γ′ strengthening combined with strongly textured coarse and elongated grain structure. Finer, equiaxed grains reduce creep strength at higher temperatures due to grain boundary deformation processes and premature pore formation, but have only minor impact at low and intermediate temperatures.
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Collaboration with Plansee GmbH (Lechbruck, Germany) and with the Leibniz Institute for Solid State and Materials Research (Dresden, Germany) is greatly appreciated.
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Manuscript submitted November 12, 2008.
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Nganbe, M., Heilmaier, M. Creep Behavior and Damage of Ni-Base Superalloys PM 1000 and PM 3030. Metall Mater Trans A 40, 2971–2979 (2009). https://doi.org/10.1007/s11661-009-0003-2
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DOI: https://doi.org/10.1007/s11661-009-0003-2