NICKEL ALLOY HAVING SUPERIOR HOT WORKABILITY AND CREEP RUPTURE CHARACTERISTIC AT HIGH TEMPERATURE

摘要

PURPOSE:To obtain the titled Ni alloy by adding a prescribed amount of Y or Mg to the composition of an Ni alloy called 'Inconel 718(R)'. CONSTITUTION:0.005-0.15% Y and/or 0.01-0.03% Mg is added to an Ni alloy consisting of, by weight, 50-55% Ni, 17-21% Cr, 4-6% Nb and Ta, 2-4% Mo, 0.1-1.5% Al, 0.1-2% Ti and the balance Fe. The resulting alloy has considerably improved hot workability and creep rupture characteristics at high temp. as compared with 'Inconel 718(R)'. The rupture time of the alloy is about twice as that of the 'Inconel 718(R)' and the alloy has a remarkably prolonged rupture life.