| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for heat treating a forged member composed of a nickel base superalloy having a chemical compsn. contg., by weight, 11 to 13% Cr, 8 to 17% Co, 6 to 8% Mo, 4 to 5% Ti, 4 to 5% Al, <=1.5% Nb, <=1% Hf, Cr, B and Zr respectively by <=500ppm, and the balance Ni by 100%. SOLUTION: After the operation of hot forging executed at a temp. included in the range from the temp. lower than theγ' solvus temp. by 95 deg.C to a temp. lower than theγ' solvus temp. by 45 deg.C, at a deforming speed in the range of 5×$10<-5> s<-1> to 2×10<-2> s<-1> and at a deforming rate of >0.1 and before super- solvus heat treating executed at a temp. included in the range from the temp. higher than theγ' solvus temp. by 5 deg.C to the temp. higher than theγ' solvus temp. by 25 deg.C for 1 to 4hr, intermediate heat treating is executed at a temp. included in the range from the temp. lower than theγ' solvus temp. by 95 deg.C to the temp. lower than theγ' solvus temp. by 30 deg.C for 1 to 24hr.
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