Effects of neutron irradiation on tensile properties in high-purity Fe-(9-50)Cr and Fe-50Cr-x W alloys

Abstract

Neutron-irradiation effects on the tensile properties of high-purity Fe-(9-50)Cr and Fe-50Cr-(0-8)W alloys were investigated. These alloys were irradiated at 400, 500, and 600°C to a damage of about 0.4 dpa in a reactor. The yield and ultimate strengths increased by the irradiation, and the increment of these strengths tended to increase with increasing chromium and tungsten contents. The tensile properties of the irradiated alloys were ductile, except for the Fe-50Cr and Fe-50Cr-W alloys irradiated at lower temperatures than 500°C. These behaviors are thought to be intimately related to α′-precipitates and dislocation loops formed by the irradiation. ©2000 The Japan Institute of Metals.