Magnetic property of highly neutron-irradiated nuclear pressure vessel steels

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Long-term thermal aging experiments on reactor pressure vessel steels with variable key elements have been performed in order to elucidate mechanism of magnetic property changes due to neutron irradiation embrittlement in the high fluence regime. Aging time dependence of coercivity, depending on aging temperature and initial microstructure was observed. From these results, it was concluded that magnetic property changes can be due to a combined effect of the formation of Cu precipitates, recovery process, and relaxation of lattice strain in the matrix, and the major cause is strongly dependent on initial microstructure of the steels.