Flash thermal diffusivity measurements and inspection of additively manufactured Ti-6Al-4V specimens with varying process parameters

Joseph N. Zalameda; Samuel J. A. Hocker; Erik L. Frankforter; Peter W. Spaeth; Andrew R. Kitahara

doi:10.1117/12.2663546

12 June 2023 Flash thermal diffusivity measurements and inspection of additively manufactured Ti-6Al-4V specimens with varying process parameters

Joseph N. Zalameda, Samuel J. A. Hocker, Erik L. Frankforter, Peter W. Spaeth, Andrew R. Kitahara

Author Affiliations +

Proceedings Volume 12536, Thermosense: Thermal Infrared Applications XLV; 1253608 (2023) https://doi.org/10.1117/12.2663546
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

Flash thermal diffusivity measurements were obtained on additively manufactured Ti-6Al-4V disk shaped specimens with various process parameters. For additively manufactured metal parts, processing parameters such as laser power and scanning speed are critical to ensure the desired microstructure. For this study, the laser powder bed fusion process parameters were changed at various angular sections on a 21 mm diameter and 3.0 mm thick disk. The measurement of thermal diffusivity was performed by fitting a 1-dimensional thermal model to the data pixel by pixel to produce an inspection image. The image revealed the detection of defects such as lack of fusion porosity and areas of aggregated porosity. The thermal diffusivity imagery was compared to immersion scan ultrasonic and X-ray computed tomography (CT) measurements for validation. Based on these results, additional samples were investigated using a single side thermal inspection technique to detect lack of fusion porosity and near surface voids.

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Citation Download Citation

Joseph N. Zalameda, Samuel J. A. Hocker, Erik L. Frankforter, Peter W. Spaeth, and Andrew R. Kitahara "Flash thermal diffusivity measurements and inspection of additively manufactured Ti-6Al-4V specimens with varying process parameters", Proc. SPIE 12536, Thermosense: Thermal Infrared Applications XLV, 1253608 (12 June 2023); https://doi.org/10.1117/12.2663546

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