| 摘要 |
PROBLEM TO BE SOLVED: To reduce the hardness after solution treatment in the alloy and to improve its cold workability by specifying the contents of C, Ni, Cr, Al and Ti in the alloy and specifying the range of the visual field area ratio ofηphase structure precipitated at the time of heating treatment. SOLUTION: An Fe base superalloy is incorporated with, by weight, <=0.1% C, 18 to 25% Ni, 10 to 16% Cr, 0.7 to 1.8% Al and 0.6 to 2.0% Ti and, if required, moreover with 0.1 to 1.5% Nb and one or >= two kinds among Zr, Hf, V and Ta by 1.2 to 6.5% in total in terms of Ti and Nb. This Fe base superalloy is subjected to solution treatment and is thereafter subjected to 60 to 80% cold working, and, moreover, the ratio of aηphase precipiated in the case high temp.-long time heating treatment is executed at 700 to 800 deg.C for >=200 hr is controlled to the range of 0.1 to 6.0% by a visual field area ratio. The Fe base superalloy may furthermore be incorporated with one or two kinds of Mo and W of <=3% by Mo+(1/2)W and 0.001 to 0.01% B.
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