CR-NI ALLOYS FOR FUSION-REACTORS

Results of comparative study on the physical and mechanical properties , radiation and corrosion resistance of XI-IM-I chromium-enriched ahoy (44% Cr, Ni-base, 1-2% Mo, Registered name ''Bochvalloy'') and stainl ess steels (00Cr16Ni15Mo3Nb, 06Cr18Ni10Ti) in the water coolant at tem perature up to 350 degrees C have been presented, The XHM-1 alloy is a bsolutely stable against corrosion cracking, which differs from the be havior of the stainless steels listed. Under tensile stress reaching t he yield strength of the material, no corrosion-induced damage of the alloy has occurred in water with various chloride and oxygen contents at a temperature in the range of 50-350 degrees C. In most of the case s, both change of the mechanical strength and relative elongation is n ot observed after irradiation of the alloy with I a dose up to 32 dpa at a temperature of 350 degrees C, which is another distinctive featur e of the alloy, as compared to the steels. Concerning totality of the properties, the XHM-1 alloy is very promising material for water coole d fusion reactor components. (C) 1998 Elsevier Science B.V. All rights reserved.