| 摘要 |
PURPOSE:To produce a dispersion strengthened alloy having high strength and excellent intergranular stress corrosion cracking resistance in high-temp. and high-pressure water by adding the carbide and nitride of fine-grained Cr to an Ni alloy contg. Cr, Ti, etc., and molding the alloy then subjecting the molding to a heat treatment under adequate conditions. CONSTITUTION:The fine-grained Cr carbide such as Cr3C2, Cr7C3 or Cr23C6 or Cr nitride such as CrN or Cr2N is added to the base alloy contg. 35-75wt% Ni, 10-30% Cr, <=0.04% C, <=6% Mo, 1-5% Ti, 0.4-5% Al, 1-10% Nb, and the balance Fe and further contg. respectively <=0.1% >=1 kinds among rare earth elements, Mg, and Ca at need. Such alloy is then molded by a spray dispersion method, HIP, etc. The molding is held for 2min-5.0hr at 980-1,200 deg.C and is then cooled at a high cooling rare above air cooling. The molding is subjected to >=1 times of aging treatment for 1.0-100hr at 550-850 deg.C. The dispersion strengthened alloy having the high strength of >=70kg/mm<2> 0.2% yield strength at a room temp. and >=110kg/mm<2> tensile strength and the stress corrosion cracking resistance is thus obtd. |
