METHOD FOR PREVENTING HE EMBRITTLEMENT OF METAL MATERIAL FOR NEUTRON IRRADIATION CIRCUMSTANCE

摘要

PURPOSE:To prevent the titled embrittlement, by applying working heat treatment contg. recrystallization and the grain growing course at a suitable temp. range, to metal material contg. B of Fe, Ni, Cr or Co systems. CONSTITUTION:To metal material contg. B of Fe, Ni, Cr, or Co systems such as super alloy, working heat treatment contg. recrystallization and its grain growing course is applied at temp. range of the recrystallization temp. or that to recrystallization temp. by 50 deg.C. It is effective to perform the heat treatment at reheating soln. treatment or direct quenching after rolling. About 30sec-10 min is suitable for treating time. In this way, B contained in material is pptd. and dispersed in grain as B system ppts. to decrease grain boundary B quantity and He embrittlement of the titled material is suppressed.