STP484: Correlation Between the Mechanical Properties and Microstructure of Irradiated Iron and Low-Carbon Steel

    Stefanović, VM
    Associate research metallurgists, Boris Kidric Institute of Nuclear Sciences, Vinca,

    Milašin, NLj
    Associate research metallurgists, Boris Kidric Institute of Nuclear Sciences, Vinca,

    Pages: 16    Published: Jan 1970


    Abstract

    The radiation hardening of iron and low-carbon steel was studied on the basis of transmission electron microscopy and tension test data. No visible defects were observed in the iron specimens after irradiation to 3.5×1019 n/cm2, E>1 MeV, at 35 C, as well as after postirradiation annealing at 150 C. Marked microstructural changes occurred in steel irradiated to 2.5×1018 n/cm2 both at 320 C and 450 C. In the former case a 5.1×109 cm-2 increase in dislocation density was found, while in the latter the presence of small dislocation loops of average diameter 200 Å and density 2.4×1014 cm-3 was observed.

    The approximative theoretical values of yield stress increment were calculated using the models for hardening by small dislocation loops and by a dislocation forest and were compared with the experimental values of the yield stress increment. A satisfactory agreement was obtained.

    Keywords:

    Neutron irradiation, radiation effects, mechanical properties, yield stress, microstructure, crystal defects, crystal structure, dislocations (materials), lattices (mathematics), tension tests, electron microscopy, hardening, iron, carbon steels, metal foils


    Paper ID: STP26651S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP26651S


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