Melt pool monitoring in laser beam melting with two-wavelength holographic imaging

作     者：Matthieu Piniard Beatrice Sorrente Gilles Hug Pascal Picart 

作者机构：DOTAONERAUniversitéParis Saclay91123 PalaiseauFrance Laboratoire d’Étude des MicrostructuresONERA-CNRSUMR 10429 Avenue de la Division Leclerc92320 ChâtillonFrance Laboratoire d’Acoustique de l’Universitédu MansCNRS 6613Institut d’Acoustique-Graduate School(IAGS)Le Mans UniversitéAvenue Olivier Messiaen72085 Le MansFrance 

出 版 物：《Light(Advanced Manufacturing)》 (光（先进制造）（英文）)

年 卷 期：2022年第3卷第1期

页      面：154-165页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Laboratory Procédés et Ingénierie en Mécanique et Matériaux Metiers Institute of Technology Centre National de la Recherche Scientifique, CNRS, (8006) Direction Générale de l’Armement, DGA Office National d'études et de Recherches Aérospatiales, ONERA 

主　　题：Laser beam melting Optical diagnostic Digital holography Multi-wavelength holography 

摘      要：Over the past two decades, laser beam melting has emerged as the leading metal additive manufacturing process for producing small- and medium-size structures. However, a key obstacle for the application of this technique in industry is the lack of reliability and qualification mainly because of melt pool instabilities during the laser-powder interaction, which degrade the quality of the manufactured components. In this paper, we propose multi- wavelength digital holography as a proof of concept for in situ real-time investigation of the melt pool morphology. A two-wavelength digital holographic setup was co-axially implemented in a laser beam melting facility. The solidified aluminum tracks and melt pools during the manufacturing of 316L were obtained with full- field one-shot acquisitions at short exposure times and various scanning velocities. The evaluation of the complex coherence factor of digital holograms allowed the quality assessment of the phase reconstruction. The motion blur was analyzed by scanning the dynamic melt pool.