Solid-solution strengthened austenitic alloys

A solid-solution strengthened austenitic alloy having excellent high-temperature strength consisting essentially of, in weight percent, no more than 0.1 % carbon, from 4 (%C) to 1 % titanium and/or niobium (alone or in combination), from 25 % to 55 % cobalt, from 10 % to 22 % chromium, from 13 % to 25 % tungsten, wherein the amount of 1/5 (%Co) + (%Cr) + (%W) is in the range from 40 % to 44%, at least one element selected from the group consisting of no more than 0.05 % magnesium, no more than 0.02 % boron, no more than 0.2 % yttrium and no more than 0.5 % hafnium, and the balance essentially nickel except for impurities, the amount of carbon being sufficient to form MC type carbides with the titanium and niobium, the amount of said at least one element being sufficient to suppress grain boundary diffusion at high temperature.

A solid-solution strengthened austenitic alloy having excellent high-temperature strength consisting of, in weight percent, about 0.05 % carbon, either about 0.4 % titanium or 0.6 % niobium, about 30 % cobalt, about 16 % chromium, about 20 % tungsten, about 0.01 % magnesium, about 0.05 % zirconium and the balance essentially nickel.