SYMPOSIA PAPER Published: 22 September 2020
STP163120190160

Toward Understanding the Role of Surface Texture for Additively Manufactured Metal Parts

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In the interest of evaluating as-built and finished surfaces of additively manufactured (AM) parts, the surfaces of AM parts must be better understood. The variability in surface quality of an AM produced part, both before and after surface finishing, has made it difficult to standardize reporting methodologies for measurement and characterization. While previous standards provide a starting point for measurement, the surfaces of metal powder bed fusion (MPBF) AM parts vary greatly from conventionally machined and formed parts. Recent work at EWI through the ASTM Additive Manufacturing Center of Excellence is concentrating on developing a standardized guide for measuring surface texture, part characterization, and metrics of AM parts. While this guide is currently under development, here we review the current state of surface texture with respect to AM, its analysis, and we describe the associated challenges. Areas of focus include measurement, analysis, and application-based issues such as comparing metrics across measurement techniques (contact stylus profilometry, laser confocal, focus variation, coherence scanning interferometry), knowing the appropriate bandpass filters to use for analysis, and how to incorporate inspection into AM part design. Mainly, there is a large disconnect among the AM, surface metrology, materials science, and application realms in regards to optimal AM surface specifications, indicating a high need for collaborative efforts among these groups.

Author Information

Brooks, Adam, J.
EWI, Buffalo, NY, US
Dhakad, Arushi
EWI, Buffalo, NY, US
Diaz, Agustin
REM Surface Engineering, Brenham, TX, US
Kowalik, Daniel
EWI, Buffalo, NY, US
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Pages: 61–87
DOI: 10.1520/STP163120190160
ISBN-EB: 978-0-8031-7709-3
ISBN-13: 978-0-8031-7708-6