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Quantitative characterization of the substructure of AISI 316 stainless steel resulting from creep

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Abstract

The substructure of AISI 316 stainless steel resulting from creep deformation has been quantitatively characterized using transmission electron microscopy. The specimens were tested at temperatures and stresses ranging from 593° to 816°C and 8000 to 35,000 psi, respectively. Subgrains whose boundaries are predominantly (111) twist boundaries were formed in all tests at and above 704°C but were observed very infrequently at 650°C and were completely absent after creep at 593°C. The subgrain diameter,d, and the mobile dislocation density, ρ, were found to vary with the applied stress, σa, according to:d =kσa -1 and ρα σa 2. Subgrain misorientation varys from less than 0.1 to 1 deg in each specimen seemingly independent of all parameters evaluated. A double triple node dislocation configuration was frequently observed in all specimens. Its relation to the deformation process is discussed in a mechanism involving the breaking of attractive dislocation nodes.

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Authors and Affiliations

  1. General Electric Co., San Jose, Calif

    Kenneth D. Challenger

  2. Materials Science and Metallurgical Engineering Department, University of Cincinnati, USA

    John Moteff (Associate Professor of Materials Science)

Authors
  1. Kenneth D. Challenger
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  2. John Moteff
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Formerly Graduate Student, Materials, Science and Metallurgical Engineering Department, University of Cincinnati, Cincinnati, Ohio 45221

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Challenger, K.D., Moteff, J. Quantitative characterization of the substructure of AISI 316 stainless steel resulting from creep. Metall Trans 4, 749–755 (1973). https://doi.org/10.1007/BF02643084

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  • DOI: https://doi.org/10.1007/BF02643084

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