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Single-phase ferritic solidification mode in austenitic-ferritic stainless steel welds

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Abstract

The macro- and microstructures of about 50 different stainless welds of the AISI/AWS 300 series are analyzed. The results indicate that under conditions corresponding to a typical SMA welding, those and only those welds in which the ratio Creq/Nieq≳1.95, where Nieq and Creq are the nickel and chromium equivalents on the Schaeffler diagram, solidify as single-phase ferrite: Austenite subsequently forms from ferrite in the solid state by a Widmanstätten mechanism. The microstructure at room temperature (RT) is characterized by straight phase boundaries and a distinct orientation relationship between the austenite and ferrite. The compositional differences observed at RT are mainly a consequence of the solid state transformation, not of solidification.

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Authors and Affiliations

  1. Laboratory of Physical Metallurgy, University of Oulu, 90570, Oulu 57, Finland

    N. Suutala (Research Staff Member) & T. Moisio (Head of Laboratory)

  2. Outokumpu Company, 95400, Tornio, Finland

    T. Takalo (Research Engineer)

Authors
  1. N. Suutala
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  2. T. Takalo
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  3. T. Moisio
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Additional information

T. TAKALO, formerly Research Staff Member, University of Oulu

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Suutala, N., Takalo, T. & Moisio, T. Single-phase ferritic solidification mode in austenitic-ferritic stainless steel welds. Metall Trans A 10, 1183–1190 (1979). https://doi.org/10.1007/BF02811664

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  • DOI: https://doi.org/10.1007/BF02811664

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