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The mechanisms of improved creep strength in a new austenitic stainless steel

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Abstract

An addition of 40 ppm boron, 0.4 pct vanadium and 0.12 pct nitrogen to an austenitic stainless type steel AISI 316L (0.02 C, 18 Cr, 12 Ni, 2.7 Mo) has considerably improved the creep properties. The improved creep properties are due to a combination of the precipitation of fine stable vanadium nitrides on the dislocations and the precipitation of chromium carbides (M23C6) in the grain boundaries. The latter process is thought to be enhanced by the presence of boron and helps to improve the creep ductility. The precipitation of vanadium nitrides on the dislocations retard the creep rate. The nitrides retain their small size even after long creep testing times. A model is proposed to explain this behavior of the precipitated particles and their interactions with the dislocations.

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Authors and Affiliations

  1. AB Atomenergi, Nyköping, Sweden

    L. G. Liljestrand (Research Metallurgist)

  2. Uddeholm AB, Hagfors, Sweden

    A. Omsén (Manager of Product Development)

Authors
  1. L. G. Liljestrand
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  2. A. Omsén
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Formerly with Uddeholm AB, Hagfors, Sweden

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Liljestrand, L.G., Omsén, A. The mechanisms of improved creep strength in a new austenitic stainless steel. Metall Trans A 6, 279 (1975). https://doi.org/10.1007/BF02667282

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  • DOI: https://doi.org/10.1007/BF02667282

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