A vacuum selective laser melting method with a beam profile control was developed to fabricate the high quality 3D object. To investigate the quality of 3D fabrication, the denudation zone (DZ) as a quality indicator was evaluated to make a single bead. The main challenge is to clarify the correlation between the DZ and beam profiles. The beam profiles, such as a Gaussian mode, a doughnut mode, and a flat-top mode, were formed in several modes, by a dioptric system with a beam shaper. A stainless steel 316L (SS316L) powder was irradiated in arbitrary pressure to form a single bead, and then the DZ was measured. As a result, it was found that the flat-top mode recorded the minimum value of the DZ under atmospheric pressure. Thus, the dynamics of the metal vapor while the laser irradiation were observed by the Schlieren imaging technique under atmospheric pressure. The average velocity of metal vapor with flat-top mode was the slowest, i.e., 0.199 m/s. It was found that the DZ becomes small depending on the dynamics of metal vapor. The ambient pressure was reduced to 300 Pa in order to reduce the gas movement, and the DZ with flat-top mode was improved to record a minimum value of 0.048 mm, 1/3 of the DZ at atmospheric pressure.
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February 2023
Research Article|
December 21 2022
Suppression of denudation zone using laser profile control in vacuum selective laser melting
Masahiro Ihama;
Masahiro Ihama
(Formal analysis, Investigation, Methodology, Visualization, Writing – original draft)
1
Graduate School of Engineering, Osaka University
, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Yuji Sato;
Yuji Sato
a)
(Conceptualization, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing)
2
Joining and Welding Research Institute, Osaka University
, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
a)Author to whom correspondence should be addressed: sato@jwri.osaka-u.ac.jp
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Yuta Mizuguchi;
Yuta Mizuguchi
(Investigation, Methodology)
1
Graduate School of Engineering, Osaka University
, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Norio Yoshida;
Norio Yoshida
(Investigation, Methodology)
2
Joining and Welding Research Institute, Osaka University
, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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Sasitorn Srisawadi
;
Sasitorn Srisawadi
(Investigation, Methodology)
3
National Metal and Materials Technology Center
, 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand
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Dhritti Tanprayoon;
Dhritti Tanprayoon
(Investigation, Methodology)
3
National Metal and Materials Technology Center
, 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand
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Tetsuo Suga
;
Tetsuo Suga
(Supervision)
2
Joining and Welding Research Institute, Osaka University
, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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Masahiro Tsukamoto
Masahiro Tsukamoto
(Conceptualization, Investigation, Methodology, Supervision, Writing – review & editing)
2
Joining and Welding Research Institute, Osaka University
, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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a)Author to whom correspondence should be addressed: sato@jwri.osaka-u.ac.jp
Note: Paper published as part of the special topic on Proceedings of the International Congress of Applications of Lasers & Electro-Optics 2022.
J. Laser Appl. 35, 012004 (2023)
Article history
Received:
June 19 2022
Accepted:
December 01 2022
Citation
Masahiro Ihama, Yuji Sato, Yuta Mizuguchi, Norio Yoshida, Sasitorn Srisawadi, Dhritti Tanprayoon, Tetsuo Suga, Masahiro Tsukamoto; Suppression of denudation zone using laser profile control in vacuum selective laser melting. J. Laser Appl. 1 February 2023; 35 (1): 012004. https://doi.org/10.2351/7.0000749
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