Investigation of the thermal history of L-PBF metal parts by feature extraction from in-situ SWIR thermography

S. Oster; C. Maierhofer; G. Mohr; K. Hilgenberg; A. Ulbricht; S. J. Altenburg

doi:10.1117/12.2587913

12 April 2021 Investigation of the thermal history of L-PBF metal parts by feature extraction from in-situ SWIR thermography

S. Oster, C. Maierhofer, G. Mohr, K. Hilgenberg, A. Ulbricht, S. J. Altenburg

Author Affiliations +

Proceedings Volume 11743, Thermosense: Thermal Infrared Applications XLIII; 117430C (2021) https://doi.org/10.1117/12.2587913
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Laser powder bed fusion is used to create near net shape metal parts with a high degree of freedom in geometry design. When it comes to the production of safety critical components, a strict quality assurance is mandatory. An alternative to cost-intensive non-destructive testing of the produced parts is the utilization of in-situ process monitoring techniques. The formation of defects is linked to deviations of the local thermal history of the part from standard conditions. Therefore, one of the most promising monitoring techniques in additive manufacturing is thermography. In this study, features extracted from thermographic data are utilized to investigate the thermal history of cylindrical metal parts. The influence of process parameters, part geometry and scan strategy on the local heat distribution and on the resulting part porosity are presented. The suitability of the extracted features for in-situ process monitoring is discussed.

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Citation Download Citation

S. Oster, C. Maierhofer, G. Mohr, K. Hilgenberg, A. Ulbricht, and S. J. Altenburg "Investigation of the thermal history of L-PBF metal parts by feature extraction from in-situ SWIR thermography", Proc. SPIE 11743, Thermosense: Thermal Infrared Applications XLIII, 117430C (12 April 2021); https://doi.org/10.1117/12.2587913

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