Journal
JOURNAL OF LASER APPLICATIONS
Volume 27, Issue -, Pages -Publisher
AMER INST PHYSICS
DOI: 10.2351/1.4898835
Keywords
selective laser melting; lattice structure; compression test; ultimate tensile strength; brittle fractures; stress-strain curve; specific energy absorption
Funding
- German Research Foundation DFG within the Cluster of Excellence Integrative Production Technology for High-Wage Countries
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This paper focusses on the investigation of the mechanical properties of lattice structures manufactured by selective laser melting using contour-hatch scan strategy. The motivation for this research is the systematic investigation of the elastic and plastic deformation of TiAl6V4 at different strain rates. To investigate the influence of the strain rate on the mechanical response (e.g., energy absorption) of TiAl6V4 structures, compression tests on TiAl6V4-lattice structures with different strain rates are carried out to determine the mechanical response from the resulting stress-strain curves. Results are compared to the mechanical response of stainless steel lattice structures (316L). It is shown that heat-treated TiAl6V4 specimens have a larger breaking strain and a lower drop of stress after failure initiation. Main finding is that TiAl6V4 lattice structures show brittle behavior and low energy absorption capabilities compared to the ductile behaving 316L lattice structures. For larger strain rates, ultimate tensile strength of TiAl6V4 structures is more than 20% higher compared to lower strain rates due to cold work hardening. (C) 2014 Laser Institute of America.
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