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    Reduced Activation Austenitic Stainless Steels: The Fe-Mn-Cr-C System


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    Nickel-free manganese-stabilized stainless steels are being developed for fusion reactor applications. As the first part of this effort, the austenite-stable region in the Fe-Mn-Cr-C system was determined. Results indicated that the Schaeffler diagram developed for Fe-Ni-Cr alloys cannot be used to predict the constituents expected for high manganese steels. This indicator is true because manganese is not as strong an austenite stabilizer relative to δ-ferrite formation as predicted by the diagram, but it is a stronger austenite stabilizer relative to martensite than predicted. Therefore, the austenite-stable region for Fe-Mn-Cr-C alloys occurs at lower chromium and higher combinations of manganese and carbon than predicted by the Schaeffler diagram. Development of a manganese-stabilized stainless steel should be possible in the composition range of 20 to 25% manganese, 10 to 15% chromium, and 0.1 to 0.25% carbon. Tensile behavior of an Fe-20%Mn-12%Cr-0.25%C alloy was determined. The strength and ductility of this possible base composition was comparable to Type 316 (UNS 531600) stainless steel in both the solution-annealed and cold-worked condition.


    manganese-stabilized stainless steels, reduced-activation steels, Fe-Mn-Cr-C alloys, Schaeffler diagram, austenite-stable alloys, martensite, δ-ferrite, tensile properties

    Author Information:

    Klueh, RL
    Research metallurgist, Oak Ridge National Laboratory, Oak Ridge, TN

    Maziasz, PJ
    Research metallurgist, Oak Ridge National Laboratory, Oak Ridge, TN

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP24945S