Repair method for complexing of inner flow passages of single-crystal or directional-crystal alloy blades

Abstract

The invention discloses a repair method for complexing of inner flow passages of single-crystal or directional-crystal alloy blades. The repair method includes step S100, judging and analyzing blade failure and defects before repair; step S200, cutting failure or defective portions of the blades, and polishing and cleaning the blades; step S300, mounting pre-produced and pretreated complexing molds used for guaranteeing high-accuracy complexing of inner flow passage structures of the blades, and fastening the complexing molds in to-be-repaired blade cavities, wherein the complexing molds are core molds with outer surfaces capable of forming blade cavity flow passages through solidification of follow-up blade material melts; step S400, preheating to-be-repaired portions to more than 75% ofa material melting point calculated by Kelvin, and allowing the blade repair portions to extend externally to grow in a direction control way according to a metal melt filling method; step S500, removing the complexing molds after metal cladding, and performing follow-up processing on the blades. The repaired blades meet application requirements of the single-crystal or directional-crystal blades,service life of the blades is prolonged to the greatest extent, and the repair method has great theoretical and practical significance.

Description

technical field [0001] The invention relates to the field of repairing aviation components, and in particular to an epitaxy repairing method for realizing high-precision reconstruction of the inner channel structure of a single crystal or oriented crystal alloy blade. Background technique [0002] As the "crown jewel" of modern industry, the technological level of aero-engines is an important symbol to measure a country's comprehensive scientific and technological level, industrial basic strength and comprehensive national strength. The development of modern aviation industry is closely related to the progress of aero-engine technology. The performance of aero-engines The indicators directly determine the performance of the aircraft. As an important component of aero-engines and ground-based gas turbines, the comprehensive performance of blades, such as service temperature and service life, seriously restricts the progress of aero-engine technology. At the same time, due to...

AI Technical Summary

Problems solved by technology

During the repair process of single crystal or oriented crystal blade, the microstructure grows epitaxially with the solidification of the molten pool, but when the single crystal or oriented crystal structure grows to a certain height, the equiaxed crystal structure is easy to appear and destroy the single crystal or oriented crystal structure. to grow

Due to the lack of grain boundary strengthening elements in common nickel-based superalloy blade materials, once the grain boundary, especially the grain boundary perpendicular to the main stress axis of the blade, is formed, it is easy to cause crack initiation and propagation at the grain boundary under stress, which seriously threatens the blade. service safety

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