STP1046

    High Temperature Helium Embrittlement: Austenitic Versus Martensitic Stainless Steels

    Published: Jan 1990


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    Abstract

    A comparison of the susceptibility of different materials to helium embrittlement in in-beam creep rupture experiments (that is. thermal creep tests during helium implantation) at 873 K is presented. The materials used were a martensitic stainless steel. Deutsches Institut für Normung (DIN) 1.4914. and two austenitic stainless steels with three different microstructures, American Iron and Steel Institute (AISI) 316 (UNS S31600) S 20% cold worked. DIN 1.4970 13% cold worked, and DIN 1.4970. 13% cold worked and aged 24 h at 1073 K. The mechanical data show large differences in both creep rupture strength and degradation by the helium. These differences are correlated to the different microstructures and the resulting helium bubble microstructures. The results are discussed in the light of the gas driven growth model for helium embrittlement, which is the working mechanism for austenites at higher temperatures in the parameter range used.

    Keywords:

    helium embrittlement, martensitic stainless steel, austenitic stainless steel, in-beam experiments, creep rupture, helium bubble microstructure, helium growth, gas driven growth model, critical radius


    Author Information:

    Schroeder, H
    Institut für Festkörperforschung, KFA JülichAssociation EURATOM-KFA, Jülich,

    Stamm, U
    Institut für Festkörperforschung, KFA JülichAssociation EURATOM-KFA, Jülich,


    Paper ID: STP24643S

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP24643S


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