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Specification and Characterization of Laser Powder Bed Fusion Surface Textures for Heat Transfer in Internal Channels

Published

Author(s)

M M Towfiqur Rahman, Chris Evans, Jason Fox, Jimmie Miller, Jaime Berez

Abstract

Metal additive manufacturing (AM) and particularly, laser powder bed fusion (LPBF), is a candidate process for the manufacture of intricate internal cooling channels used in heat transfer applications. Although unique geometries optimal for heat transfer may be manufactured via LPBF, this being an extrinsic design choice, it is unclear if the intrinsic surface texture characteristics of LPBF offer preferable heat transfer characteristics. This paper presents a discussion of the potential correlations between the surface texture characteristics and heat transfer properties of LPBF surfaces accompanied by original work. Emphasis is placed on a rigorous metrological approach to the problem that may be used to unambiguously specify and verify functional surface texture characteristics. It is demonstrated that the implementation of robust Gaussian filtering with varying cutoff lengths can attenuate the amplitude of surface features possibly relevant to heat transfer characteristics. The values of ISO 25178-2 areal surface texture parameters were found to vary significantly because of this attenuation. Emphasis is placed on a rigorous metrological approach to the problem that may be used to unambiguously specify and verify functional surface texture characteristics. These initial findings encourage a systematic investigation of a wider variety of filtering methods as well as non-parameter based characterization.
Proceedings Title
Proceedings of the American Society for Precision Engineering (ASPE) and European Society for Precision Engineering and Nanotechnology (euspen) Special Interest Group Meeting: Advancing Precision in Additive Manufacturing
Conference Dates
July 14-19, 2024
Conference Location
Golden, CO, US
Conference Title
The American Society for Precision Engineering (ASPE) and European Society for Precision Engineering and Nanotechnology (euspen) Special Interest Group Meeting: Advancing Precision in Additive Manufacturing

Citation

Rahman, M. , Evans, C. , Fox, J. , Miller, J. and Berez, J. (2024), Specification and Characterization of Laser Powder Bed Fusion Surface Textures for Heat Transfer in Internal Channels, Proceedings of the American Society for Precision Engineering (ASPE) and European Society for Precision Engineering and Nanotechnology (euspen) Special Interest Group Meeting: Advancing Precision in Additive Manufacturing, Golden, CO, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958199 (Accessed February 11, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created July 15, 2024, Updated January 30, 2025