Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7972512 | Materials Science and Engineering: A | 2018 | 13 Pages |
Abstract
The effect of two travel speeds on thin Ti-6Al-4V buildups produced by Laser Wire Deposition (LWD) has been investigated. A travel speed set at 1.4â¯mm/s promoted recrystallization of columnar prior β grains into horizontal prior β grains. It was associated with lower strength hardly meeting minimum wrought requirements as set by the AMS4911. On the other hand, it was shown that by increasing the travel speed to 7.2â¯mm/s, sufficiently high cooling rates are occurring creating a fine αâ¯+â¯Î² basket weave structure, while no recrystallization of the prior β grains has been observed. Tensile properties were improved with strength consistently exceeding minimum wrought requirements. An additional stress relief cycle preserved the effect of deposition parameters on material properties. A strong anisotropy in elongation was associated with the slower travel speed where higher values were derived along the Z direction. While the faster travel speed exhibited isotropic properties. Strengthening of the deposits has been observed following a stress relief cycle.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
N. Chekir, Y. Tian, R. Gauvin, N. Brodusch, J.J. Sixsmith, M. Brochu,