MANUFACTURE OF ZIRCONIUM BASE ALLOY MEMBER

摘要

PURPOSE:To obtain a high ductility and high strength Zr alloy member having superior corrosion resistance by passing a Zr alloy through five stages including the 1st stage in which the alloy is subjected to soln. heat treatment by rapid cooling from a temp. in the alpha+beta or beta phase temp. range. CONSTITUTION:A Zr base alloy contg. Nb, Sn and Fe is refined. The alloy is rapidly cooled from a temp. in the alpha+beta or beta phase temp. range in the 1st stage. The alloy is repeatedly subjected to cold working in the 2nd stage and intermediate heat treatment at the eutectoid temp. or above in the 3rd stage. The alloy is finally cold worked in the 4th stage and it is aged at a low temp. in the alpha phase temp. range below the eutectoid temp. in the 5th stage. Thus, beta-Zr is uniformly precipitated in the alpha-Zr phase having high ductility.