STP956

    Mechanical Properties and Fracture Behavior of 20% Cold-Worked 316 Stainless Steel Irradiated to Very High Neutron Exposures

    Published: Jan 1987


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    Abstract

    Stainless steels irradiated in EBR-II at temperatures in the range 380 to 500°C tend to exhibit saturation of mechanical properties at relatively low fluence levels. At fluences on the order of 13 to 15 × 1022 n/cm2 (E > 0.1 MeV), however, there is a rapid increase in hardness just after the onset of void swelling. The hardness increase is not attributed just to the voids themselves but rather to an indirect effect of voids on nickel depletion in the alloy matrix. The strong dependence of stacking fault energy on nickel and chromium content and particularly on deformation temperature combine to promote extensive stress-induced formation of ε-martensite at room temperature. This leads to a very brittle failure mode characterized as quasi-cleavage. At higher deformation temperatures it leads to a failure mode designated as channel fracture.

    Keywords:

    316 stainless steels, neutron irradiation, swelling, mechanical properties, fracture toughness, failure modes, ε-martensite, radiation-induced segregation, inverse Kirkendall effect, stacking fault energy


    Author Information:

    Hamilton, ML
    Manager of Mechanical Properties Section, senior engineer, and fellow scientist, Hanford Engineering Development Laboratory, Richland, WA

    Huang, F-H
    Manager of Mechanical Properties Section, senior engineer, and fellow scientist, Hanford Engineering Development Laboratory, Richland, WA

    Yang, WJS
    Principal engineer, General Electric Company, Pleasanton, CA

    Garner, FA
    Manager of Mechanical Properties Section, senior engineer, and fellow scientist, Hanford Engineering Development Laboratory, Richland, WA


    Paper ID: STP25655S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP25655S


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