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ABSTRACT
This study reports the variability of the fatigue strength of specimens manufactured by the laser powder bed fusion process with respect to their location on the build plate. Specimens from the right-hand and left-hand halves of the build plate were tested under high cycle fatigue. Comparison of the fatigue data suggests that the specimens manufactured on the right-hand half of the build plate have a higher fatigue strength than those manufactured on the left-hand half. One reason for the observed discrepancy in fatigue strength was the higher accumulation of spattered powder particles on the left-hand side as compared to the right-hand side of the build plate. These spattered particles are oxidised, and form defects such as inclusions within the specimen.
Acknowledgements
Mr Anton Dahl-Jendelin is acknowledged for performing the examination of defects by image analysis.
Disclosure statement
No potential conflict of interest was reported by the author.
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Sepehr Hatami
Sepehr Hatami completed his MSc degree in materials processing at the Royal Institute of Technology (in Stockholm Sweden), and obtained his PhD degree in 2010 in the field of powder metallurgy from Chalmers University of Technology (Gothenburg, Sweden). After his PhD studies, Sepehr joined SKF, and worked in R&D as a welding process specialist. Since 2015, he has been part of the additive manufacturing group at RISE IVF (a Swedish research institute). Currently, his research is focused on the laser powder bed fusion process, and he is active in numerous nationally funded research projects both as a researcher and project manager.