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Ductility of stabilized ferritic stainless steel welds

  • Mechanical Behavior
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Abstract

An investigation was made into the mechanism of ductility loss in low interstitial 18 Cr-2Mo ferritic stainless steel welds stabilized with Ti and Nb. It was found that stabilizing TiN or Nb(C,N) precipitates are dissolved during the welding process, resulting in a finer distribution of precipitates in the weld metal than in the base metal. Furthermore, the FATT was found to increase by more than 200°C, leading to decreased room temperature ductility. Such an increase in FATT may not be explained solely in terms of grain growth. Internal friction measurements indicate that no free nitrogen is present in the weld metal, yet wet chemical analysis reveals that the nitrogen is present in a soluble form. Kinetic arguments suggest that the stabilized nitrogen dissolved during welding tends to reprecipitate during solidification in the form of a chromium rich nitride phase.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    G. B. Hunter (Undergraduate Student) & T. W. Eagar (Assistant Professor)

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  1. G. B. Hunter
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  2. T. W. Eagar
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Hunter, G.B., Eagar, T.W. Ductility of stabilized ferritic stainless steel welds. Metall Trans A 11, 213–218 (1980). https://doi.org/10.1007/BF02660625

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