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The separate roles of subgrains and forest dislocations in the isotropic hardening of type 304 stainless steel

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Abstract

Tests on 304 stainless steel were conducted involving first warm working in torsion, then cold working in torsion, and finally measurement of the elevated-temperature yield strength in compression. These tests permitted separation of the effects of subgrain size and forest dislocation density on the isotropic part of the flow stress. Forest dislocation strengthening appears to dominate in this material. The results are best fitted by a root-mean-square summation of strength terms representing the contributions of solutes, forest dislocations, and subgrain boundaries. The same equation successfully predicts the flow stress during elevated-temperature transient deformation (under both constant strain rate and variable strain rate) from the transient dislocation substructure.

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Authors and Affiliations

  1. Materials Science Division, Lawrence Livermore National Laboratory, 94550, Livermore, CA

    M. E. Kassner

  2. Department of Materials Science and Engineering, Stanford University, 94305, Stanford, CA

    A. K. Miller (Associate Professor) & O. D. Sherby (Professor)

Authors
  1. M. E. Kassner
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  2. A. K. Miller
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  3. O. D. Sherby
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formerly Research Assistant, Department of Materials Science and Engineering, Stanford University.

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Kassner, M.E., Miller, A.K. & Sherby, O.D. The separate roles of subgrains and forest dislocations in the isotropic hardening of type 304 stainless steel. Metall Trans A 13, 1977–1986 (1982). https://doi.org/10.1007/BF02645943

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  • DOI: https://doi.org/10.1007/BF02645943

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