Numerical Simulation of the Effects of Preheating on Electron Beam Additive Manufactured Ti-6Al-4V Build Plate

Jun Cao; Philip Nash

doi:10.4028/www.scientific.net/MSF.879.274

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Numerical Simulation of the Effects of Preheating...

Numerical Simulation of the Effects of Preheating on Electron Beam Additive Manufactured Ti-6Al-4V Build Plate

Abstract:

In an earlier study, a 3-D thermomechanical coupled finite element model was built and experimentally validated to investigate the evolution of the thermal residual stresses and distortions in electron beam additive manufactured Ti-6Al-4V build plates. In this study, an investigation using this robust and accurate model was focused on an efficient preheating method, in which the electron beam quickly scanned across the substrate to preheat the build plate prior to the deposition. Various preheat times, beam powers, scan rates, scanning paths and cooling times (between the end of current preheat scan/deposition layer and the beginning of the next preheat scan/deposition layer) were examined, and the maximum distortion along the centerline of the substrate and the maximum longitudinal residual stress along the normal direction on the middle cross-section of the build plate were quantitatively compared. The results show that increasing preheat times and beam powers could effectively reduce both distortion and residual stress for multiple layers/passes components.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

274-278

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.274

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Online since:

November 2016

Authors:

Jun Cao, Philip Nash*

Keywords:

Additive Manufacture, Electron Beam, Finite Element Analysis, Preheating, Ti-6Al-4V

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* - Corresponding Author

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