Repair method for defects in nickel-based superalloy castings

Abstract

The invention discloses a method for repairing defects of a nickel-based alloy casting, which is characterized in that the hole diameter of the defect is first enlarged and penetrated, and the hole position of the enlarged hole is cleaned and dried. Paste the baffle, and spread nickel-based alloy powder with the same composition and uniform thickness on the hole on the other side and around the hole, compact the alloy powder, completely cover the hole and the substrate around the hole, adjust The laser spot is aligned with the center of the hole, and the spot size is adjusted to be larger than the diameter of the hole after reaming, and then the laser is turned on to clad the nickel-based alloy to the hole; turn over the side of the nickel-based alloy sticker, and drill the hole , remove the residues and defects in the hole after cladding on the first side, clean and dry the hole position of the enlarged hole, and repeat the above cladding steps; finally, perform a high-temperature solid-melting stabilization treatment to complete the repair process. In the repairing method of the present invention, the metallographic structure of the repaired place is exactly the same as that of the original material, which greatly reduces waste due to casting defects.

Description

technical field [0001] The invention relates to a repairing technology, in particular to a method for repairing defects of nickel-based alloy castings. Background technique [0002] Nickel-based superalloys are used in the most critical high-temperature components of gas turbines for aircraft, ships, industries, and vehicles, such as turbine blades, guide vanes, and integral turbines. They are generally manufactured by casting processes, but there are many defects in the casting process. Common Casting defects such as blowholes, shrinkage cavities, blisters, sticky sand and cracks, etc., the casting yield is extremely low, and casting defects have always been an unavoidable and difficult problem in the foundry industry. The repair of high-temperature nickel-based alloys has been a problem that has plagued the industry for many years. The conventional method for repairing unqualified castings is mainly to use non-identical materials for repair welding. However, high-temperatu...

AI Technical Summary

Problems solved by technology

[0002] Nickel-based superalloys are used in the most critical high-temperature components of gas turbines for aircraft, ships, industries, and vehicles, such as turbine blades, guide vanes, and integral turbines. They are generally manufactured by casting processes, but there are many defects in the casting process. Common Casting defects such as air holes, shrinkage cavities, blisters, sticky sand and cracks, etc., the casting yield is extremely low, and casting defects have always been an unavoidable and difficult problem in the foundry industry

The repair of high-temperature nickel-based alloys has been a problem that has plagued the industry for many years. The conventional method for repairing unqualified castings is mainly to use non-identical materials for repair welding. However, high-temperature nickel-based alloys are very easy to crack when using traditional arc welding, requiring skilled workers. Can lead to increased damage leading to scrapped parts and are therefore referred to as non-solderable materials

Especially when high-temperature nickel-based alloys are used in some special fields, the repair area must use the same material, and the finished product requires zero defects, which further increases the difficulty and the welding yield is extremely low

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