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Internal stresses and structures developed during creep

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Abstract

Specimens of 304 stainless steel subjected to different thermomechanical histories develop different internal stresses, σ i , and different substructures. Creep rate is uniquely related not to the applied stress, σ A , but to the effective stress, σ*=(σ A −σ i ). Values of σ* are determined from experimental results and σ i calculated from σ i =(σ A −σ*). Results show σ i increases with the applied stress according to σ i ∝σ 1.7 A . Transmission electron microscopic observations show that the density of dislocations within subgrains, ϱ D , and the subgrain diameter,D, vary with applied stress according to: ϱ D ∝σ K A ,D ∝ σ −0.8 A , whereK=1.4 to 2.0. Subgrain misorientation is independent of creep stress, strain, or temperature. The contributions of these structural variables to the internal stress are discussed.

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Authors and Affiliations

  1. E. C. Bain Laboratory for Fundamental Research, U. S. Steel Corporation, Research Center, Monroeville, Pa.

    L. J. Cuddy (Senior Scientist)

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  1. L. J. Cuddy
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Cuddy, L.J. Internal stresses and structures developed during creep. Metall Trans 1, 395–401 (1970). https://doi.org/10.1007/BF02811548

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  • DOI: https://doi.org/10.1007/BF02811548

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