Relation between Magnetism and Charpy Impact Properties in Thermally Aged Fe-Cu Model Alloys

摘要

The objective of this study is to investigate the correlation between magnetic properties and the degree of embrittlement in thermally aged Fe-Cu alloys, with and without pre-deformation, which are the model specimens simulated for the irradiation embrittlement of nuclear reactor pressure vessel steels. With increasing aging time, the ductile-brittle transition temperature of both specimens increased due to Cu precipitation. On the other hand, the coercive field of as-quenched specimens increased, whereas that of pre-deformed specimens decreased under thermal aging. These results suggest the importance of the role of initial dislocation density for understanding the magnetic characteristics of irradiated steels.