STP956: Experimental Assessments of Notch Ductility and Tensile Strength of Stainless Steel Weldments After 120°C Neutron Irradiation

    Hawthorne, JR
    Research metallurgist and senior engineer, Materials Engineering Associates, Inc., Lanham, MD

    Menke, BH
    Research metallurgist and senior engineer, Materials Engineering Associates, Inc., Lanham, MD

    Awadalla, NG
    Research staff engineer and research engineer, E. I. du Pont de Nemours & Co., Savannah River Laboratory, Aiken, SC

    O'Kula, KR
    Research staff engineer and research engineer, E. I. du Pont de Nemours & Co., Savannah River Laboratory, Aiken, SC

    Pages: 16    Published: Jan 1987


    Abstract

    The Charpy-V (Cv) properties of American Iron and Steel Institute (AISI) 300 series stainless steel plate, weld, and weld heat-affected zone (HAZ) materials from commercial production weldments in 406-mm-diameter pipe (12.7-mm wall) were investigated in unirradiated and irradiated conditions. Weld and HAZ tensile properties were also assessed in the two conditions. The plates and weld filler wires represent different steel melts; the welds were produced using the multipass metal inert gas (MIG) process. Weldment properties in two test orientations were evaluated. Specimens were irradiated in a light water cooled and moderated reactor to 1 × 1020 n/cm2, E > 0.1 MeV, using a controlled temperature assembly. Specimen tests were performed at 25 and 125°C.

    The radiation-induced reductions in Cv energy absorption at 25°C were about 42% for the weld and the HAZ materials evaluated. A trend of energy increase with temperature was observed. The concomitant elevation in yield strength was about 53%. The increase in tensile strength in contrast was only 16%. The postirradiation yield strength of the axial test orientation in the pipe was less than that of the circumferential test orientation.

    Results for the HAZ indicate that this component may be the weakest link in the weldment from a fracture resistance viewpoint.

    Keywords:

    stainless steels, weld deposits, weld heat affected zone, radiation embrittlement, nuclear irradiation, notch ductility, tensile strength, fracture resistance, 120°C irradiation


    Paper ID: STP25651S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP25651S


    CrossRef ASTM International is a member of CrossRef.