Single crystal metal deposition using laser additive manufacturing technology for repair of aero-engine components

Abstract

Nickel based single crystal alloys are extensively employed in aero-engine system involving high temperature conditions due to its superior creep resistance and high strength. The aero-engine parts undergo degradation and affect the functional performance due to extreme and severe service operating environment. Therefore repairing of those parts are economically viable than replacing them with newer ones. Recently metal additive manufacturing technology gaining importance in remanufacturing and repair of engineering parts. Particularly direct metal deposition (DMD) technique has attracted research community due to its versatility particularly for repair activities. However, currently achieving single crystal (SX) microstructure during remanufacturing are challenging and mainly depends on the geometry and shape of the damaged parts. In addition, both geometrical and microstructural integrity in the repaired parts are prime concern for its optimum performance during in-service situations. In this present study the existing status of DMD technique employed and its challenges for remanufacturing of SX based aero-engine parts are addressed. © 2021 Elsevier Ltd. All rights reserved.