Time-Resolved Geometric Feature Tracking Elucidates Laser-Induced Keyhole Dynamics

Integrating Materials and Manufacturing Innovation - Tập 10 - Trang 677-688 - 2021
Jongchan Pyeon1, Joseph Aroh1, Runbo Jiang1, Amit K. Verma1,2, Benjamin Gould3, Andy Ramlatchan4, Kamel Fezzaa5, Niranjan Parab6, Cang Zhao7, Tao Sun8, Anthony D. Rollett1,2
1Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, USA
2NextManufacturing Center, Carnegie Mellon University, Pittsburgh, USA
3Argonne National Laboratory, Applied Materials Division, Lemont, USA
4NASA Langley Research Center, Hampton, USA
5Argonne National Laboratory, X-ray Science Division, Lemont, USA
6Intel Corporation, Hillsboro, USA
7Department of Mechanical Engineering, Tsinghua University, Beijing, China
8Department of Materials Science and Engineering, University of Virginia, Charlottesville, USA

Tóm tắt

During laser melting of metals, localized metal evaporation resulting in the formation of a keyhole shaped cavity can occur if processing conditions are chosen with high power density. An unstable keyhole can have deleterious effects in certain applications (e.g., laser powder bed fusion) as it increases the likelihood of producing defects such as porosity. In this work, we propose a pipeline that enables complete segmentation and extraction of various geometric features in keyholing conditions. In situ synchrotron high-speed X-ray visualization at the Advanced Photon Source provides large datasets of experimental images with a high spatio-temporal resolution across a range of laser parameters for Ti-6Al-4V. Computer vision image processing techniques were used to extract time-resolved quantitative geometric features (e.g., depth, width, front wall angle) throughout keyhole evolution which were subsequently analyzed to understand the relationship between the variation of local keyhole geometry and processing conditions. This analysis is the first to employ a data-driven approach to further our understanding of the keyholing process regime.

Tài liệu tham khảo

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