Journal
MATERIALS CHARACTERIZATION
Volume 127, Issue -, Pages 137-145Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2017.01.014
Keywords
Selective laser melting; Ti-6Al-4V; Texture; Tensile property; Anisotropy
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Funding
- National Program on Key Basic Research Project of China (973 Program) [613281]
- National Natural Science Foundation of China [50905068]
- Fundamental Research Funds for the Central Universities [HUST: 2016YXZD005]
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The crystallographic texture of Ti-6Al-4V produced by selective laser melting (SLM) under various laser energy densities was characterized by electron backscatter diffraction technique to explore its effect on the anisotropy in tensile properties. Results show that crystallographic orientation depending on laser energy density acts a significant role in determining the mechanical anisotropy of SLMed Ti-6Al-4V samples. The microstructure of the SLMed Ti-6Al-4V samples consists of fully martensites. As for the martensites, the fraction of basal orientations decreases, while the content of prismatic orientations increases with laser energy density increasing from 101 to 269 J/mm(3). And the order of the dominated crystallographic orientation of martensites with the laser energy density is (12 (3) over bar0)[2 (11) over bar3] -> (11 (2) over bar4)[1 (3) over bar 41] -> (11 (2) over bar0)[1 (1) over bar 01] -> (11 (2) over bar0)[2 (2) over bar 03]. There is anisotropy in tensile properties between horizontally and vertically built samples, which is more obvious with laser energy density. The formation of such anisotropy is ascribed to the higher Schmid factor values of the grains in the vertically built tensile samples than those in horizontally built ones. (C) 2017 Elsevier Inc. All rights reserved.
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