| 摘要 |
PROBLEM TO BE SOLVED: To obtain a gas turbine blade excellent in fatigue characteristic and crack resistance by restraining an inter-granular linearity of a welded metal in the gas turbine blade containing the welded part. SOLUTION: In the part of the gas turbine blade, in which a part ofγ' phase precipitating strengthened type Ni based ultra-alloy base material is constituted with the welded metal, the welded metal is the Ni-based alloy containing 4.8-5.3 wt.% Ta, 18-23 wt.% Cr, 12-17 wt.% Co, 14-18 wt.% W, 0.03-0.1 wt.% C, 1-2 wt.% Mo,≤1 wt.% Al and 0-30ppm oxygen content, 0-0.1 wt.% Ti content, 0-0.5 Re content. The blade-base material is manufactured with: the step of stripping; the step of solution heat treatment, in whichγ' phase is dissolved again; the step of welding in the inert gas chamber by TIG method with a welding wire, in which the above weld metal can be obtained; the step of HIP treatment at 1,100-1,150°C; and the step of aging treatment at 835-855°C. COPYRIGHT: (C)2009,JPO&INPIT
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