Abstract
Abstract The effect of helium injection on the mechanical properties of FeCrMn 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 FeCrMn 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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