Additive manufacturing by means of laser-aided directed metal deposition of 2024 aluminium powder: Investigation and optimization. (August 2017)

• Record Type: Journal Article
• Authors: Caiazzo, Fabrizia; Alfieri, Vittorio; Argenio, Paolo; Sergi, Vincenzo
• Is Part Of: Advances in mechanical engineering. Volume 9:Number 8(2017:Aug.)
• Publication Date: 2017-08
• Subjects: Directed metal deposition -- aluminium alloy -- additive manufacturing -- optimization -- microstructures; Mechanical engineering -- Periodicals; 621.05
• DOI: 10.1177/1687814017714982
• Languages: English
• ISSNs: 1687-8132

Abstract

Directed metal deposition by means of laser beam is investigated in this article. The process is receiving increasingly interest in the frame of additive manufacturing to the purpose of maintenance, repair and overhaul of condemned products when severe conditions hindering the working order have been experienced. Minimal distortion, reduced heat-affected zones and better surface quality are benefited in comparison with conventional techniques. Namely, metal feeding of 2024 aluminium powder is considered to produce clad traces on 2024 aluminium plates, aiming to give grounds for repairing damaged real components using materials with same or similar features with respect to the parent metal. A fibre-delivered disc laser and a three-way feeding nozzle are used. The responses are discussed in terms of geometry, microstructure and microhardness both in the fusion zone and in the heat-affected zone; the optimization is conducted via desirability functions, based on proper technical constraints upon numerical modelling. Reparation of real parts, where cracks are machined to produce V-grooves to be filled, is aimed.