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    STP579

    Cryogenic Properties of Iron-Manganese and Iron-Manganese-Chromium Alloys

    Published: 01 January 1975


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    Abstract

    A wide range of microstructures were obtained in iron-manganese alloys by varying the manganese and chromium contents. When a body centered cubic α structure was produced, increasing amounts of manganese were found to be detrimental to low temperature toughness. At manganese levels greater than 12 percent where appreciable amounts of ε and γ phases formed, the ductile-brittle transition temperature dropped rapidly. In terms of the ϵ + γ phases present, the ductile-brittle transition temperature decreased at a rate of 1.3°C/volume percent ε + γ. Increasing the ε + γ content to achieve good low temperature toughness, however, also caused a decrease in the yield strength. Increases in the yield strength were achieved without appreciable increase in the ductile-brittle transition temperature by greater manganese and chromium additions.

    Keywords:

    storage tanks, fracture properties, ductile brittle transition, mechanical properties, microstructure


    Author Information:

    Schanfein, MJ
    Lawrence Berkeley LaboratoryCollege of Engineering, University of California, Berkeley, Calif.

    Yokota, MJ
    Lawrence Berkeley LaboratoryCollege of Engineering, University of California, Berkeley, Calif.

    Zackay, VF
    Lawrence Berkeley LaboratoryCollege of Engineering, University of California, Berkeley, Calif.

    Parker, ER
    Lawrence Berkeley LaboratoryCollege of Engineering, University of California, Berkeley, Calif.

    Morris, JW
    Lawrence Berkeley LaboratoryCollege of Engineering, University of California, Berkeley, Calif.


    Committee/Subcommittee: E50.01

    DOI: 10.1520/STP29169S