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Residual Lattice Strain and Phase Distribution in Ti-6Al-4V Produced by Electron Beam Melting
Open AccessArticle

Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting

1
Faculty of Mechanical Engineering, Institute of Machine and Industrial Design, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic
2
Institute of Production Engineering, Graz University of Technology, Inffeldgasse 25F, 8010 Graz, Austria
3
Institute of Materials Science, Joining and Forming, Graz University of Technology, Kopernikusgasse 24/I, 8010 Graz, Austria
4
Materials—Institute for Laser and Plasma Technology, Joanneum Research, Leobner Straße 94, 8712 Niklasdorf, Austria
*
Author to whom correspondence should be addressed.
Materials 2019, 12(6), 930; https://doi.org/10.3390/ma12060930
Received: 26 February 2019 / Revised: 13 March 2019 / Accepted: 18 March 2019 / Published: 20 March 2019
(This article belongs to the Special Issue Progress in Metal Additive Manufacturing and Metallurgy)
The aim of this study is to observe the effect of process parameters on residual stresses and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated parameters were hatch laser power, hatch laser velocity, border laser velocity, high-temperature preheating and time delay. Residual stresses were evaluated by the bridge curvature method and relative density by the optical method. The effect of the observed process parameters was estimated by the design of experiment and surface response methods. It was found that for an effective residual stress reduction, the high preheating temperature was the most significant parameter. High preheating temperature also increased the relative density but caused changes in the chemical composition of Ti6Al4V unmelted powder. Chemical analysis proved that after one build job with high preheating temperature, oxygen and hydrogen content exceeded the ASTM B348 limits for Grade 5 titanium. View Full-Text
Keywords: Selective Laser Melting; Ti6Al4V; residual stress; deformation; preheating; relative density; powder degradation Selective Laser Melting; Ti6Al4V; residual stress; deformation; preheating; relative density; powder degradation
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MDPI and ACS Style

Malý, M.; Höller, C.; Skalon, M.; Meier, B.; Koutný, D.; Pichler, R.; Sommitsch, C.; Paloušek, D. Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting. Materials 2019, 12, 930.

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