Abstract
Joints of austenitic steel 316L brazed by NiP and NiCrP alloys have been irradiated with 10 MeV Xe 3+ ions or 14 MeV Ar 3+ ions up to 30 dpa. The microhardness of the phases in these joints in the nonirradiated condition and after irradiation was measured using a Vickers diamond pyramid indenter. The microhardness of the fcc phase in the joints is about 3 GPa and that of the austenitic steel about 2 GPa. These values increased by 40–50% due to irradiation. In the initial states the microhardness of the M 3P and M 2P phases (M: Ni, Fe, Cr) is 3–5 times larger than the microhardness of the fcc solid solution phase. The microhardness of the M 3P phase decreased by about 50% on irradiation to 2 dpa due to a transition to the amorphous state. The hardness of the M 2P phase due to irradiation showed a decrease of about 25%.
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