| 摘要 |
PURPOSE:To obtain an Ni alloy which undergoes easily grain refining and has low resistance to superplastic deformation by putting Ni alloy powder having a specified composition in a container and by extruding the powder at a specified temp. in a specified extrusion ratio. CONSTITUTION:Ni alloy powder consisting of, by weight, 0.02-0.12% C, 5-12% Co, 7-9% Cr, 10-14% W, 4.5-5.5% Al, 0.1-1.5% Ti, 3-5% Ta, 0.3-1.3% Hf, 0.005-0.018% B, 0.01-0.15% Zr and the balance essentially Ni is put in a container and extruded at 1050-1225 deg.C in 4-15 extrusion ratio. The powder may be sintered by heating at 1025-1250 deg.C for 30-200min under 800-2000atm. before the extrusion. By this method and grain size can be made small without causing cracking during the extrusion. The resulting alloy has low resistance to superplastic deformation and can be worked into a large-sized article or an article of a complex shape by forging. |
