PRODUCTION OF GADOLINIUM-CONTAINING ZIRCONIUM-BASE ALLOY MATERIAL

摘要

PROBLEM TO BE SOLVED: To obtain good joinability, Gd diffusion, corrosion-resistance and mechanical properties in a material by arranging a Gd member into the recess of a Zr-base alloy base metal subjected to solution treatment, covering the other Zr-base alloy base metal thereon, executing welding and subjecting it to hot rolling, annealing, cold rolling and final annealing. SOLUTION: A Zr-base alloy is subjected to solution treatment in which it is heated to a temp. region including the phase and the phase or to a temp. region of the phase and is rapidly cooled to form into a base metal. Into a resess or a hole provided on this base metal by machining, a Gd member composed of a pure Gd or 5 to 90% Gd-contg. Zr-base alloy is engagedly arranged, and the other Zr-base alloy base metal is covered thereon, which is buried, and the environts of the joined faces of the base materials are subjected to electron beam welding with each other, and they are integrated. The obtd. composite material is subjected to hot rolling, and the Zr-base alloy base metal and the Gd member are mechanically joined at less than the + phase transition temp. Next, the composite material is subjected to annealing for removing working strains and cold plastic working for regulating the dimensions for several times to finish into prescribed dimensions, which is thereafter subjected to final annealing to obtain a member having prescribed strength.