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Mechanical Properties of AlSi10Mg Processed by Laser Powder Bed Fusion at Elevated Temperature

Mechanical Properties of AlSi10Mg Processed by Laser Powder Bed Fusion at Elevated Temperature

Category
Academic article
Abstract
AlSi10Mg processed by laser powder bed fusion is expected to have remarkable mechanical properties
due to the dominant cellular microstructure. However, the as-processed material is often both anisotropic and
containing significant residual stresses. To mitigate these problems, a retrofitted heating system was used to elevate
the process temperature to 200°C. The characterization results show low levels of porosity, anisotropy and residual
stress. Furthermore, the effect of three heat treatment conditions (as-built, stress relief, and T6) on the tensile
properties was investigated. For this purpose, 14 tensile samples were built in seven different orientations. Digital
image correlation was used to understand the deformation mechanism for each heat treatment condition. It was
observed that the as-built material has comparable properties to the stress relieved condition, while T6 heat
treatment resulted in increased ductility. Based on the results, LPBF processing of AlSi10Mg at elevated
temperature can potentially eliminate the need for post-process stress relief heat treatment.
Client
  • Research Council of Norway (RCN) / 248243
Language
English
Author(s)
Affiliation
  • Norwegian University of Science and Technology
  • SINTEF Industry / Metal Production and Processing
Year
2020
Published in
The Minerals, Metals & Materials Series
ISSN
2367-1181
Publisher
Springer
Page(s)
395 - 404