Laser cladding forming method for single-crystal MCrAlY coating on single-crystal high-temperature alloy matrix
A high-temperature alloy and laser cladding technology, which is applied in the direction of metal material coating process, coating, crystal growth, etc., can solve the problems of discontinuity, performance discontinuity, and reducing the service life of blades, etc., and achieve fine dendrite structure, combined excellent effect
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Embodiment 1
[0038] In this example, a single crystal MCrAlY coating is prepared on the first generation single crystal superalloy SRR99 substrate according to the method described in the technical solution of the present invention. SRR99 single crystal superalloy rods were prepared by the traditional spiral selection method, and the rod diameter was Φ16mm. The alloy bars were solution heat treated at 1295°C / 4h. Then, a base material is cut out from the single crystal alloy rod. The MCrAlY coating powder required in this example is TMBC-1 powder prepared by argon atomization, and the powder particle size is -100 to +300 mesh. Before laser cladding, the surface of the single crystal alloy substrate to be clad is polished with 240# sandpaper, and then sandblasted with corundum sand. The airflow pressure during sandblasting is 2.2MPa, and the surface roughness after sandblasting is 0.9Ra. The MCrAlY powder was dried at 150°C / 1h. When cladding, the laser power used is 600w, the laser spot d...
Embodiment 2
[0040]In this embodiment, a single crystal MCrAlY coating is prepared on the second-generation single crystal superalloy RenéN5 substrate according to the method described in the technical solution of the present invention. The oriented RenéN5 single crystal superalloy rods were prepared by the traditional seed crystal method, and the rod diameter was Φ16mm. The alloy bar was subjected to solution treatment at 1300°C / 4h, and the base material was cut from the bar. The angle between the normal direction of the substrate surface and the direction of the substrate is not greater than 10°. The MCrAlY coating powder used in this example is TMBC-1 powder prepared by argon atomization, and the powder particle size is -100 to +450 mesh. Before laser cladding, the surface of the alloy substrate was polished with 150# sandpaper, and then sandblasted with corundum sand. The air pressure during sandblasting was 2.0MPa, and the surface roughness after sandblasting was 0.8Ra. The MCrAlY...
Embodiment 3
[0042] In this example, a single crystal MCrAlY coating is prepared on the second generation single crystal superalloy CMSX-4 substrate according to the method described in the technical solution of the present invention. CMSX-4 single crystal superalloy rods were prepared by the traditional spiral selection method. After the rod is subjected to solution heat treatment at 1300°C / 4h, the base material is cut by wire cutting, and the angle between the normal line direction of the base material surface and the direction of the base material is not greater than 10°. In this example, the TMBC-1 powder prepared by argon atomization was used as the coating powder, and the powder particle size was -100 to +450 mesh. Before cladding, the surface of the alloy substrate was polished with 240# sandpaper and sandblasted with 2.2MPa corundum sand, and the surface roughness after sandblasting was 0.9Ra. When cladding, the laser power used is 1000w, the laser spot diameter is 0.9mm, the pro...
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