| 摘要 |
PURPOSE:To obtain a die alloy for fixed temp. forging usable even in high temp. air and superior in oxidation resistance and high temp. compressive strength by adding a specified quantity of Al and Mo to Ni and alloying. CONSTITUTION:As die material used for fixed temp. forging of super heat resisting alloy while heating die to high temp. of 1,000-1,150 deg.C, a Ni base alloy contg. 4-10wt% Al, 13-23wt% Mo is used. In addition to said components, <0.1wt% rare earth element or Y is contained to the alloy to improve the oxidation resistance at initial heating. In the Mo content, <=10% Mo is substituted by <=15% W or <=15% Ta so that the relation of (%W+%Ta)X2/3=Mo% is obtained, and the high temp. strength and high temp. compressive strength are improved. The high temp. compressive strength can be improved also by substituting furthermore <=20% Ni in the Ni content by Co.
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