Laser cladding repairing method for aircraft end-journal part surface

Abstract

The invention belongs to the technical field of laser cladding, relates to a laser cladding repairing method for aircraft end-journal part surface, particularly to a method for repairing the mechanical wear and scrape malfunction of an aircraft end-journal part after long-time service by adopting the laser fused deposition technology. The method aims at mechanical wear, scrape and other defects on the surface of the part, selects spherical precipitation to harden stainless steel metal dust, adopts reasonable laser cladding technological parameters, and removes residual stress of the part after cladding through the specific heat treatment technology to recover the performance of the aircraft end-journal and realize repairing of lengthening the service life. The repaired end-journal part hardly deforms, and the depth of a heat affected area is no more than 0.5mm; the repairing area does not have the defects of cracks, incomplete fusion and slag inclusion; the serviceability of the repaired end-journal is recovered.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, and relates to a laser cladding repair method for the surface of aircraft end journal parts, in particular to a laser fusion deposition technology for mechanical wear and tear of aircraft end journal parts after long-term service. Repair scratches. Background technique [0002] The journal part of the aircraft end is an important load-bearing part used to fix the engine on an aircraft. Its material is usually 1Cr15Ni4Mo3N semi-austenitic precipitation hardening stainless steel. This material has high strength, low notch sensitivity, and excellent transverse mechanical properties. and corrosion resistance. However, after the aircraft went through a refurbishment cycle, it was found that the surface of some end journals had different degrees of axial or circumferential scratches or wear, resulting in rough surfaces and out-of-tolerance phenomena of the parts. The depth of scratches and wea...

AI Technical Summary

Problems solved by technology

Obviously, the heat input (≥0.5KJ / mm) of the commonly used fusion welding repair methods (such as manual arc welding, argon arc welding, etc.) is relatively large, which is likely to cause large deformation of the end journal parts during the repair process. The depth of the rear heat-affected zone is also relatively large, and it is difficult to meet the requirements of the factory or the overhaul manual

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