Effect of electron-beam irradiation temperature on irradiation damage of high Mn–Cr steel

The effect of electron-beam irradiation temperature on irradiation damage of a high Mn–Cr austenitic steel for structure material of nuclear and/or fusion reactors from the point of view of the reduced radio-activation was investigated by using the 1250 kV HVEM and an energy dispersed X-ray analyzer (EDX) in a 200 kV FE-TEM with beam diameter of about 0.5 nm. Void formation was not observed even at the elevated irradiation temperature. Dislocation loop growth was observed and the density and size of dislocation loop increased with irradiation dose. Irradiation-induced segregation of Cr and Mn at grain boundaries were observed by electron-beam irradiation condition. The amount of Mn segregation increased with irradiation temperature, however, the case of Cr was suppressed.