STP380

    Low-Temperature Embrittlement of Iron, Iron Alloys, and Steels by Neutron Irradiations

    Published: Jan 1965


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    Abstract

    The low-temperature embrittlement of iron, iron alloys, and A212-B and modified Hy 80 steels in unirradiated and irradiated conditions was studied using the tension test. A radiation-induced transition temperature (embrittlement) at 125 to 130 K occurs only in irons with carbon content of about 30 ppm or greater. Embrittlement occurs with exposure as low as 2 X 1018 nvt and the embrittling temperature does not increase with exposure. This embrittlement is attributed to a carbon-vacancy defect formed by trapping of a carbon atom by a radiation-produced vacancy. Additions of substitutional alloys reduce this change in the embrittlement temperature.

    No correlation has been found between the radiation-induced, low-temperature tensile embrittlement and the shift in notched impact transition temperature observed at higher temperatures.


    Author Information:

    Chow, J. G. Y.
    Metallurgist and metallurgy associate, Brookhaven National Laboratory, Upton, N. Y.

    McRickard, S. B.
    Metallurgist and metallurgy associate, Brookhaven National Laboratory, Upton, N. Y.


    Paper ID: STP43525S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP43525S


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