Volumetric defect classification in Nano-resolution X-ray computed tomography images of laser powder bed fusion via deep learning

Autor: Vaghefi, Ehsan, Hosseini, Seyedmehrab, Azimi, Mohsen, Shmatok, Andrii, Zhao, Rong, Prorok, Bart, Mirkoohi, Elham
Zdroj: Journal of Manufacturing Processes; July 2024, Vol. 121 Issue: 1 p499-511, 13p
Abstrakt: Additively manufactured (AMed) components often contain volumetric defects that significantly impact mechanical and fatigue properties across various material systems. Nano-resolution X-ray computed tomography (XCT) provides precise imaging of these defects, however, XCT software struggles to differentiate between types of defects (e.g., lack of fusion, gas-entrapped pores, and keyhole), each with distinct effects on mechanical properties. To address this problem, we introduce VolDefSegNet, an automated framework based on convolutional neural networks (CNNs), for semantic segmentation of common volumetric defects in AMed components. VolDefSegNetincorporates deep learning techniques and leverages seven defect features for automated defect labeling, enhancing robustness and generalization. We trained VolDefSegNeton a comprehensive dataset of approximately 90,000 labeled defects and achieved superior performance metrics (F1-score of 0.91 and IoU of 0.68) compared to alternative models. Additionally, we explored the impact of various hyperparameters on VolDefSegNet’s performance to identify optimal hyperparameters for the framework, highlighting the framework’s potential in streamlining defect classification processes despite the challenges posed by XCT machine and software.
Databáze: Supplemental Index
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