STP529: Property Changes Resulting from Impurity-Defect Interactions in Iron and Pressure Vessel Steel Alloys

    Smidt, FA
    Section head and research metallurgist, Reactor Materials Branch, Naval Research Laboratory, Washington, D.C.,

    Sprague, JA
    Section head and research metallurgist, Reactor Materials Branch, Naval Research Laboratory, Washington, D.C.,

    Pages: 14    Published: Jan 1973


    Abstract

    The effects of 0.3 atomic percent copper, vanadium, nickel, and phosphorus and 0.1 atomic percent carbon addition on the irradiation response of pure iron have been investigated to clarify the role of copper and phosphorus in embrittlement of pressure vessel steels. Compression tests and transmission electron microscopy (TEM) analysis of the aforementioned alloys and selected heats of pressure vessel steel and weldment have been examined after irradiation to fluences of 2.5 × 1019 and 4.5 × 1020 n/cm2 > 1 MeV at 290 C (550 F). Copper is found to influence the properties by promoting nucleation of defect aggregates, probably vacancy loops, at low fluences, thus increasing the radiation strengthening and shifting the transition temperature upward. Small voids were observed in the 0.3Ni, 0.3Cu, and 0.1C alloys and in pure iron but not in 0.3V or 0.3P alloys.

    Keywords:

    radiation damage, radiation effects, embrittlement, mechanical properties, compression tests, transmission electron microscopy, pressure vessel, steels, welds, voids, impurities, copper


    Paper ID: STP35437S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP35437S


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