Laser polishing - Enhancing surface quality of additively manufactured cobalt chrome and titanium components

Wojciech Stanisław Góra, Yingtao Tian, Aldara Pan Cabo, Marcus Ardron, Robert R. J. Maier, Philip B. Prangnell, Nicholas J. Weston, Duncan Paul Hand

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Additive manufacturing (AM) allows construction of complex, free surface structures that cannot be produced as lone parts using traditional mechanical manufacturing. A commonly-used AM process is selective laser melting (SLM) where a high intensity laser beam selectively scans a powder bed according to the computer- Aided design of the component to be produced and the powder metal particles are melted into the required pattern. Unfortunately AM components show poor surface quality, in particular due to partially fused particles from the metal powder used in the AM process. As a result post processing of AM parts is essential to improve the quality of the surface to suit specific industrial needs. Currently SLM manufactured parts are chemically or mechanically polished, but both of these methods have their drawbacks. Mechanical polishing is limited by the complexity of the AM structure, whereas electrochemical polishing struggles if selective polishing of small areas is desired. The laser polishing process is based on the melting and subsequent solidification of a micro-layer of material, using a laser beam as the heat source for a smooth topography. As a result laser polishing offers a highly repeatable, short duration process that is capable of selective polishing of microscale areas. We are therefore presenting the possibility of using both pulsed and CW lasers to improve the surface quality of titanium and cobalt chromealloyAM parts toprovidetailoredaesthetic andtribological requirements. A range ofdifferent scan strategies, employing differentscanning directions, energy densitiesandspeeds, also different laser powersand spot diameters are investigated.

Original languageEnglish
Title of host publicationProceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology May 30th-3rd June 2016, Nottingham, UK
EditorsP. Bointon, R. Leach, N. Southon
PublisherEuspen
ISBN (Electronic)9780956679086
Publication statusPublished - 2016
Event16th International Conference of the European Society for Precision Engineering and Nanotechnology 2016 - Nottingham, United Kingdom
Duration: 30 May 20163 Jun 2016

Conference

Conference16th International Conference of the European Society for Precision Engineering and Nanotechnology 2016
Abbreviated titleEUSPEN 2016
CountryUnited Kingdom
CityNottingham
Period30/05/163/06/16

Keywords

  • Additive manufacturing
  • Laser finishing
  • Laser polishing
  • Selective laser melting

ASJC Scopus subject areas

  • Materials Science(all)
  • Environmental Engineering
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Instrumentation

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  • Cite this

    Góra, W. S., Tian, Y., Pan Cabo, A., Ardron, M., Maier, R. R. J., Prangnell, P. B., Weston, N. J., & Hand, D. P. (2016). Laser polishing - Enhancing surface quality of additively manufactured cobalt chrome and titanium components. In P. Bointon, R. Leach, & N. Southon (Eds.), Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology May 30th-3rd June 2016, Nottingham, UK Euspen.