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- Title
Effect of modulated pulses on the fabrication of Ti-6al-4v by spatter-less selective laser melting in vacuum.
- Authors
Mizuguchi, Yuta; Ihama, Masahiro; Sato, Yuji; Yoshida, Norio; Srisawadi, Sasitorn; Tanprayoon, Dhritti; Tsukamoto, Masahiro
- Abstract
This study investigated the effects of laser irradiation using selective laser melting with a modulated pulsed laser on the amount of spatter generated during processing, the crystalline phase, and hardness of Ti64 samples. A high-speed video camera observed the spatter generation on a 20-layer Ti64 compact fabricated on a pure Ti substrate. The modulated pulsed laser generated less spatter than a continuous-wave (CW) laser. Vickers hardness measurements and crystalline phase analyses of the cross sections of the sample showed that the modulated pulsed laser also fabricated harder samples with more β-phase than the CW laser. Additionally, a modulated pulsed laser with a smaller frequency produced samples with the smoothest surface, highest hardness, and largest amount of β-phase. These results demonstrate that a modulated pulsed laser can control the crystalline phase and hardness of the modeled object while simultaneously suppressing spatter generation. These results indicate that this approach using a modulated pulsed laser and the appropriate parameters can control the microstructure and hardness while simultaneously suppressing spatter generation.
- Subjects
SELECTIVE laser melting; CONTINUOUS wave lasers; VICKERS hardness; CAMCORDERS
- Publication
Applied Physics A: Materials Science & Processing, 2022, Vol 128, Issue 10, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-022-06056-0