DOUBLE ALLOY BLADE Russian patent published in 2019 - IPC C23C26/00 B29C64/153 F01D5/28 

FIELD: machine building.

SUBSTANCE: invention relates to a double-alloy blade for a gas turbine, namely, a blade having at least two parts of a surface with different composition. Blade (51) for rotor (35) of gas turbine (28, 30), containing cast substrate (70), includes shank (55) for connecting blade (51) with rotor (35) of gas turbine (28, 30), platform (54) with bottom surface (61) from which shank (55) protrudes, and upper surface (62), opposite lower surface (61), airfoil (56) protruding from upper surface (62) of platform (54), anti-corrosive layer (71) of the blade alloy with a high Cr content of 15–23 %, above substrate (70), added using additive manufacturing techniques on bottom surface (61) and on shank (55). Method of manufacturing blade (71) for rotor (35) of gas turbine (28, 30) comprises the steps in which said substrate is cast (70) and anti-corrosive layer (71) made from an alloy of a blade with a high chromium content of 15–23 % is added, using an additive technology, above substrate (70) on bottom surface (61) and on shank (55).

EFFECT: gas turbine blade is provided, containing two parts that can operate in different conditions, without creating a hazard to the integrity of the blade itself, the anti-corrosive layer minimizes high-temperature corrosion and corrosion fatigue cracking on the lower part of the blade, which is not exposed to hot combustion gases, which are guided through the blades.

8 cl, 3 dwg