Laser polishing of additively manufactured Ti-6Al-4V: Microstructure evolution and material properties

Juliana S. Solheid, Sankhya Mohanty, Mohamad Bayat, Torsten Wunsch, Peter G. Weidler, Hans J. Seifert, Wilhelm Pfleging

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Laser polishing of metals consists of irradiating the part's surface with a laser beam, thus generating a molten layer that is redistributed and resolidified to create a surface with reduced roughness. However, the process is also characterized by an instantaneous formation of heat-affected zones with consequent microstructural changes that influence the mechanical properties. In order to understand the microstructural evolution during laser polishing of Ti-6Al-4V laser-based powder bed fusion samples, a thermal model is applied in the current study to predict the dimensions of the melted zones and the heat-affected areas. Furthermore, the results obtained through simulations are discussed and compared to the experimental data, thereby establishing the validity of the process models. Finally, the experimental studies also include the evaluation of material hardness and residual stresses after laser polishing.
Original languageEnglish
Article number022019
JournalJournal of Laser Applications
Volume32
Issue number2
Number of pages9
ISSN1042-346X
DOIs
Publication statusPublished - 2020

Keywords

  • Additive manufacturing
  • Laser polishing
  • Thermal model
  • Microstructure evolution
  • Material properties

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