Abstract
The temperature and strain rate dependence of yield and work hardening behavior in elevated temperature stress-strain testing was investigated in the nickel-base superalloy UDIMET 115. This alloy was heat treated to produce a bimodal distribution of hyperfine and coarse γ1 precipitates. Yield behavior is shown to be controlled primarily by dislocation pair cutting of the hyperfine precipitates. Stage II work hardening appears to be governed mainly by the dislocation networks generated on the coarse precipitates as these are bypassed under the Orowan mechanism. Analysis of Stage III work hardening using ϕvs σ plots shows that a steady state exists for the stress-strain deformation of this system. Results are also reported on extremely strong serrated flow at moderately elevated temperatures and a high temperature ductility minimum.
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RUSSELL R. JENSEN, formerly Graduate Research Assistant, Henry Krumb School of Mines, Columbia University, New York, NY
An erratum to this article is available at http://dx.doi.org/10.1007/BF02663029.
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Jensen, R.R., Tien, J.K. Temperature and strain rate dependence of stress-strain behavior in a nickel-base superalloy. Metall Trans A 16, 1049–1068 (1985). https://doi.org/10.1007/BF02811675
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DOI: https://doi.org/10.1007/BF02811675