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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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