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超高速レントゲン画像で明らかにされた,レーザー溶融における鍵穴の値と形状
Ross Cunningham1, Cang Zhao2, Niranjan Parab2
1Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA, USA.
Science (New York, N.Y.)
|February 23, 2019
まとめ
超高速X線画像は 添加材料製造における 鍵穴のダイナミクスを示しています この研究は3Dプリントプロセスの理解に不可欠な 蒸気沈み量を定量化します
科学分野:
- 材料科学
- 製造エンジニアリング
- 物理学
背景:
- メタル添加物製造,特にレーザー粉末床融合は,制御された溶融に依存しています.
- レーザー溶接で蒸気沈みまたは鍵穴が発生することが知られていますが,添加物製造におけるその動態はよく可視化されていません.
- 鍵穴の形成を理解することは,プロセス制御と部品の品質にとって非常に重要です.
研究 の 目的:
- 金属のレーザー融解中に蒸気沈み (キーホール) の形態と動態を直接視覚化し定量化します.
- レーザー粉床融合で鍵穴が形成される条件を決定する.
- 鍵穴の形成と安定性を支配する物理的メカニズムを解明する.
主な方法:
- 高エネルギーX線を用いた超高速シンクロトロンX線画像を用いた.
- レーザー粉末床溶融に関連する条件下で金属のレーザー溶融を調査した.
- 鍵穴の形状とダイナミクスを レーザーパワーとスキャン速度で分析した
主要な成果:
- 直接視覚化により, レーザー粉末床融合で使用される電力とスキャニング速度範囲の鍵穴の存在が確認されました.
- 導電モードから鍵穴モードへの移行には,レーザー電力密度の明確な値が特定されました.
- 鍵穴形成への移行は,蒸発,液体の表面沈殿,不安定,そして深い鍵穴形成のシーケンスに従います.
結論:
- キーホールの形成は,レーザー粉床融合において一般的であり,レーザーの電力密度によって支配される.
- 直接視覚化により,立体印刷プロセスを理解し制御するための物理的基盤が提供されます.
- この研究は 添加材料製造における レーザーと金属の相互作用の 基本的な物理に関する 重要な洞察を提供します
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