Abstract
In this investigation, the elevated-temperature kinematic and isotropic strength of Type 304 stainless steel are related to the subgrain size and the forest dislocation density. In earlier research by the authors, a root-mean-square (rms) equation was developed that accurately predicted the isotropic strength at 1023 K (in the power-law-breakdown regime of creep) from subgrain and dislocation density measurements. In the present study, it has been found that the rms equation also accurately predicts the isotropic strength at 1138 and 1338 K (temperatures within the power-law regime). Forest dislocation hardening appears to dominate the isotropic strength in this alloy. Kinematic stresses, or back stresses, were measured by Bauschinger effect tests at 1023 and 1123 K. The back stresses appear to be provided primarily by forest dislocations.
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A. A. ZIAAI-MOAYYED, formerly Research Assistant, Department of Materials Science and Engineering, Stanford University, is now
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Kassner, M.E., Ziaai-Moayyed, A.A. & Miller, A.K. Some trends observed in the elevated-temperature kinematic and isotropic hardening of type 304 stainless steel. Metall Trans A 16, 1069–1076 (1985). https://doi.org/10.1007/BF02811676
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DOI: https://doi.org/10.1007/BF02811676