Transient liquid phase infiltration repair method for large gap defects in superalloy hot end parts

Abstract

The invention relates to the field of high temperature alloy hot end part repairing, in particular to a high temperature alloy hot end part large gap defect transient state liquid phase infiltration repairing method. The method includes (1) removing an oxide layer and the like on the surface of a defect of a high temperature alloy hot end part to enable the defect position to have metal luster; (2) adopting nickel-base or cobalt-base alloy powder to fill the defect space, conducting molding in a plasticizing mode and then conducting high temperature sintering; (3) arranging the nickel-base alloy powder subjected to B Zr or Hf activating treatment above filling metal, conducting high temperature transient state liquid phase infiltration to achieve compacting; (4) conducting polishing and clearing; (5) conducting homogenizing treatment on the high temperature alloy hot end part under high temperature. The method can solve the problem that Al+Ti high temperature alloy hot end part is low in large gap defect repairing strength and easy to scrape, achieves high strength connection, is high in repairing yield and can overcome large gap defects such as crack, ablation holes and corrosion pits of hot end parts of aero engines, electric gas turbines, naval vessel gas turbines and caused in a service use process.

Description

Technical field:

[0001] The invention relates to the field of repairing high-temperature alloy hot-end parts, in particular to a method for repairing large-gap defects of high-temperature alloy hot-end parts by transient liquid phase infiltration. Background technique:

[0002] The hot-end components such as turbine blades, guide vanes, and nozzles of aero-engines and industrial gas turbines are prone to large gap defects such as cracks, ablation holes, corrosion pits, and wear during long-term service. As the output power of aeroengines and industrial gas turbines increases, the wear, corrosion, and ablation damage of hot-end components become more and more serious.

[0003] Aeroengines and industrial gas turbine hot end parts are usually made of nickel-based and cobalt-based alloys with excellent high-temperature mechanical properties, high-temperature oxidation resistance, and corrosion resistance, and are designed with complex profiles and cooling structures. These part...