Effect of Neutron and Electron Irradiation on Low Manganese Steels

概要

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The interaction between solute atoms and radiation induced defects was studied by means of tensile test and transmission electron microscopy. The defects were produced by neutron irradiation at 473K to a fluence of 6.4×1022n/m2 (En>1MeV) and electron irradiation at 650kV electron microscope to a fluence of 7×1025e/m2.Radiation hardening and radiation embrittlement occurred by neutron irradiation. The yield stress increased and the total elongation decreased with the increase of manganese content. Dislocation loops were observed in the iron but not detected in manganese alloys. Therefore, it will be considered that the defects would be trapped by manganese atoms and then formed complexes with carbon. Defects produced by electron irradiation were not observed by electron microscopy in the manganese alloys, however, after annealing above 598K the defect clusters, presumably interstitial type, appeared and grew. The annealing behaviors were similar for both the neutron and electron irradiated specimens.The radiation hardening could be explained by the mechanism in which manganese atoms trap carbon and interstitial atoms during irradiation and then form fine complexes, which would act as the obstacles for dislocation motion.
The Iron and Steel Institute of Japanの論文