In-situ observation of metal powder melting behavior using X-ray and thermal imaging

Yuki Wakai*, Tomoya Ogura, Shinsuke Suzuki, Shizuka Nakano, Satoshi Kajino


研究成果: Conference article査読

2 被引用数 (Scopus)


This study investigates the melting behavior of metal powder during the Laser Powder Bed Fusion (LPBF) process using in-situ X-ray and thermal imaging. The metal powder was irradiated by a 150 W-fiber laser for 1-s. As a result, a low brightness area and a light brightness hollow were generated in the X-ray image. We propose two analytical methods that use the Lambert-Beer law to investigate these parts in detail. The first analytical method differentiates a phase of the powder bed in the X-ray image. The result of the differentiation was consistent with the thermal imaging which shows that the low brightness area was a melt pool. The second analytical method calculates the width of the hollow using the brightness obtained from the X-ray image. The theoretical results for the width of the hollow were compared with the experimental data. The theoretical results were found to be 6% higher than experimental value.

ジャーナルProceedings of the International Astronautical Congress, IAC
出版ステータスPublished - 2019
イベント70th International Astronautical Congress, IAC 2019 - Washington, United States
継続期間: 2019 10月 212019 10月 25

ASJC Scopus subject areas

  • 航空宇宙工学
  • 天文学と天体物理学
  • 宇宙惑星科学


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