Low plastic polishing of titanium-coated parts

Recording technology

The deposition process of titanium-based materials is currently under development. For example, electron beam physical vapor deposition (EBPVD) can be used to form a Ti alloy coating or structural condensate on a substrate with the same or different nominal composition. These technologies can be used in the aviation and aerospace industries to repair damaged or worn parts, such as gas turbine engine components (such as blades, buckets, seals, etc.).

However, deposition defects can potentially threaten the integrity of the condensate. When droplets of material splash on the substrate or on the accumulated condensate, a set of such defects will occur. Such defects are commonly referred to as "spts". The melt pool may contain additives that are not intended to vaporize and accumulate in the condensate. For example, US Patent No. 5,474,809 discloses that refractory elements are in the melt pool. Application. Once the droplet falls on the surface (substrate or accumulating condensate), it will form multiple deposits on top of the droplet and adjacent surfaces. Along the sides of the droplet, due to the opposite side of the droplet Orientation, there may be discontinuities in the microstructure in the accumulated material. As more material accumulates, these discontinuities may continue until the final condensate surface is formed.

Summary of the invention

Ti-based coatings can have embedded defects. The defects may bring one or more structural weaknesses to the coating and coated parts. The coating is polished to provide residual compressive stress to alleviate one or more of these structural weaknesses.

The details of one or more embodiments of the present invention are set forth in the drawings and the following description. The other features, purposes and advantages of the present invention will be obvious from the clear text, drawings and claims.