Evolution of Cooling Length in Parts Created Through Laser Powder Bed Fusion Additive Manufacturing

Published

July 25, 2018

Author(s)

Zachary C. Reese, Jason C. Fox, John Taylor, Christopher Evans

Abstract

Additive manufactured (AM) components, specifically those created through laser powder bed fusion (LPBF) methods, exhibit an abundance of surface textures of varying forms and patterns. These topographies have historically been categorized solely using their Ra values, a method which offers limited information to discern differences among the morphologies of AM surfaces. This diversity is illustrated not only among parts made using different machines or processing parameters, but also between different locations in the build chaber and even on the same part. Current instruments have the potential to acquire 3D maps of the AM surface, enabling a range of field and feature based descriptors that offer potential in characterizing AM surface morphology. This work explores feature-based metrology of upward facing AM surfaces in an effort to relate features to part quality, as well as aid the modeling community in better understanding of melt pool geometry. The feature of interest in this work, the chevron pattern seen on top of scan lines, is theorized to be connected to the laser parameters used in the printing of the part. This research explores the chevron pattern, observing changes in this feature over a range of laser power and velocity combinations.

Proceedings Title

Proceedings of the 2018 ASPE and euspen Summer Topical Meeting - Advancing Precision in Additive Manufacturing

Volume

69

Conference Dates

July 22-25, 2018

Conference Location

Berkeley, CA

Conference Title

2018 ASPE and euspen Summer Topical Meeting - Advancing Precision in Additive Manufacturing

Pub Type

Conferences

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Local Download

Keywords

additive manufacturing, surface metrology, melt pool length

Citation

Reese, Z. , Fox, J. , Taylor, J. and Evans, C. (2018), Evolution of Cooling Length in Parts Created Through Laser Powder Bed Fusion Additive Manufacturing, Proceedings of the 2018 ASPE and euspen Summer Topical Meeting - Advancing Precision in Additive Manufacturing, Berkeley, CA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926267 (Accessed April 25, 2024)