Abstract

Abstract The effect of helium injection on the mechanical properties of FeCrMn alloys has been investigated. Materials used are Fe-12%Cr-15%Mn alloy and Fe-12%Cr-30%Mn alloy. The elongation of these alloys decreased with alpha particle irradiation. Intergranular-ductile fracture was observed on the Fe-12%Cr-30%Mn alloy in which alpha particles had been injected in amounts up to 2.1 × 10 17 cm −2 at the depth of range, whereas transgranular-ductile fracture occurred on the Fe-12%Cr-15%Mn alloy. These phenomena are, however, in contrast to the authors' previous result of Type 316 stainless steel which showed intergranular-brittle fracture in the helium deposited zone. The difference of formation and distribution of helium bubbles among the two FeCrMn alloys and the 316 stainless steel was recognized, and this difference is considered to be an important factor to determine the fracture modes of these materials.

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