초록 ▼

Large gas turbine blades made from separate cast segments of superalloys are disclosed. The turbine blade is designed such that bond lines between adjacent segments are placed in low stress regions of the blade. The cast superalloy segments of the blades are aligned and fitted together with specifie

Large gas turbine blades made from separate cast segments of superalloys are disclosed. The turbine blade is designed such that bond lines between adjacent segments are placed in low stress regions of the blade. The cast superalloy segments of the blades are aligned and fitted together with specified tolerances. The turbine blade segments are then joined by transient liquid phase bonding, followed by a controlled heat treatment which produces the desired microstructure in the bond region. The method allows for the production of large, high quality turbine blades by joining small, high quality cast superalloy sections, in comparison with prior attempts to cast large turbine blades as single pieces which have produced very low yields and high individual component costs.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of manufacturing a turbine blade for a land based turbine comprising the steps of:selecting a single crystal superalloy for forming the turbine blade;selecting a plurality of segments of the turbine blade to be formed by a plurality of individual castings of th

[ What is claimed is:] [1.]1. A method of manufacturing a turbine blade for a land based turbine comprising the steps of:selecting a single crystal superalloy for forming the turbine blade;selecting a plurality of segments of the turbine blade to be formed by a plurality of individual castings of the superalloy, the location of the segments being selected to place joints between adjacent segments at locations of reduced stress;forming the segments by casting the superalloy in a plurality of molds;joining the segments by transient liquid phase bonding; andprecipitation heat treating the bonded segments.