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Effect of Initial Surface Features on Laser Polishing of Co-Cr-Mo Alloy Made by Powder-Bed Fusion

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Abstract

One of the challenges regarding widespread use of parts created by the powder-bed fusion process is their high surface roughness, which necessitates some type of postbuild finishing process. Laser polishing (i.e., remelting), which uses surface-tension-driven flow to reduce the roughness of irradiated metallic surfaces, is one such potential finishing process. This work examines the effect that surface features on the as-built part have on the performance of continuous-wave laser remelting of Co-Cr-Mo alloy (Celsit 21-P, Stellite 21 equivalent) samples produced by powder-bed fusion manufacturing. This is accomplished by comparison of three-dimensional surface measurements before and after laser remelting using focus-variation microscopy. Engineering models used to simulate the surface profile as a result of laser remelting are also presented. The results from this work provide insight into the fundamental physics occurring during laser remelting on parts made by powder-bed fusion and will aid parameter selection for surface consolidation and smoothing.

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Acknowledgements

This work was partially supported by U.S. National Science Foundation (NSF) grant CMMI-1727366 and NSF-supported shared facilities at the University of Wisconsin, as well as by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation, 386371584).

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Wisconsin - Madison, Madison, WI, 53706, USA

    B. Richter & F. E. Pfefferkorn

  2. Bremer Institut für angewandte Strahltechnik GmbH, 28359, Bremen, Germany

    N. Blanke, C. Werner & F. Vollertsen

  3. University of Bremen, 28359, Bremen, Germany

    F. Vollertsen

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  1. B. Richter
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  2. N. Blanke
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  3. C. Werner
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  4. F. Vollertsen
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  5. F. E. Pfefferkorn
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Correspondence to F. E. Pfefferkorn.

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Richter, B., Blanke, N., Werner, C. et al. Effect of Initial Surface Features on Laser Polishing of Co-Cr-Mo Alloy Made by Powder-Bed Fusion. JOM 71, 912–919 (2019). https://doi.org/10.1007/s11837-018-3216-2

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  • DOI: https://doi.org/10.1007/s11837-018-3216-2

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