A numerical investigation of powder heating in coaxial laser direct metal deposition

Andrew Pinkerton, Juansethi Ibarra Medina

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Understanding the interaction phenomena between the powder stream, the laser beam and the substrate is a key aspect for improving use of laser metal deposition. In this work, the powder stream is simulated under realistic deposition conditions. The stream of particles conveyed by inert gas through a coaxial deposition nozzle is first modelled and the interaction of particles with the laser beam investigated using a lumped capacitance approach, considering both particle heating and attenuation of the laser intensity. It is found that particles are initially rapidly heated while irradiated by the laser beam. This heating mainly depends on particle trajectory and incident energy, but attenuation also plays an important role. Experimental verification using stream imaging and deposition with a Laserline 1.5 kW diode laser shows good agreement between measured and simulated results. The model adds to existing models of the powder stream, and is capable of predicting particle trajectories, thermal and phase evolution.
Original languageEnglish
Title of host publicationA numerical investigation of powder heating in coaxial laser direct metal deposition
Pages455-458
Number of pages3
Publication statusPublished - 2010
EventProceedings of the 36th Int. MATADOR Conference -
Duration: 14 Jul 2010 → …

Conference

ConferenceProceedings of the 36th Int. MATADOR Conference
Period14/07/10 → …

Keywords

  • direct metal deposition, coaxial nozzle, powder flow, laser, heat transfer and fluid flow

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