Patent ID: 6171417
Filing Date: 2001-01-09
Classification: B23P,C22F

Abstract:
A property recovering method for a Ni-base heat resistant alloy, in which a Ni-base heat resistant alloy containing, in percent by weight, 13.1-15% Cr, 8.5-10.5% Co, 1-3.5% Mo, 3.5-4.5% W, 3-5.5% Ta, 3.5-4.5% Al, 2.2-3.2% Ti, 0.06-0.12% C, 0.025% or less B, 0.01-0.05% Zr, 1-100 ppm Mg and/or Ca, and 0-1.5% Hf, the balance being Ni and unavoidable impurities, whose properties have been deteriorated by heat history, is subjected to first-stage solution treatment, in which the alloy is held at a temperature of 1175 to 1225.degree. C. for 1 to 5 hours and then furnace-cooled, then subjected to second-stage solution treatment, in which the alloy is held at a temperature of 1115 to 1165.degree. C. for 1 to 5 hours and then air-cooled, and further subjected to aging treatment, in which the alloy is held at a temperature of 810 to 860.degree. C. for 22 to 26 hours.