Abstract
The formation of abnormally large grains has been investigated in the polycrystalline nickel-based superalloy René 88DT. Cylindrical specimens with a 15 μm grain size were compressed to plastic strains up to 11.0 pct and subsequently rapidly heated to above the γ′ solvus at 1423 K (1150 \(^\circ \)C) and held for 60 seconds. All deformed samples partially recrystallized during the heat treatment, with the recrystallized grain size varying with the degree of deformation. The largest final grain size occurred in samples deformed to approximately 2 pct strain, with isolated grains as large as 700 μm in diameter observed. It is proposed that abnormally large grains appear due to nucleation-limited recrystallization, not abnormal grain growth, based on the high boundary velocities measured and the observed reduction in grain orientation spread.
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Acknowledgments
The authors acknowledge the support of Air Force Center of Excellence (Grant # FA9550-12-1-0445). V.M. Miller would like to gratefully acknowledge the support of a UC Regents’ Special Fellowship. The MRL Shared Experimental Facilities are supported by the MRSEC Program of the NSF under Award No. DMR 1121053; a member of the NSF-funded Materials Research Facilities Network (www.mrfn.org).
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Manuscript submitted August 24, 2015.
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Miller, V.M., Johnson, A.E., Torbet, C.J. et al. Recrystallization and the Development of Abnormally Large Grains After Small Strain Deformation in a Polycrystalline Nickel-Based Superalloy. Metall Mater Trans A 47, 1566–1574 (2016). https://doi.org/10.1007/s11661-016-3329-6
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DOI: https://doi.org/10.1007/s11661-016-3329-6