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Laser polishing of additively manufactured Ti-6Al-4V - Microstructure evolution and material properties [in press]

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

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 instantaneously formation of heat-affected zones with consequent microstructural changes that influences 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 the 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 the material hardness and residual stresses after laser polishing.

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Postprint §
DOI: 10.5445/IR/1000104497
Veröffentlicht am 03.01.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Institut für Mikroverfahrenstechnik (IMVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1042-346X, 1938-1387
KITopen-ID: 1000104497
HGF-Programm 37.01.02 (POF III, LK 01)
Components and Cells
Erschienen in Journal of laser applications
Projektinformation PAM^2 (EU, H2020, 721383)
Schlagwörter KNMF Project-ID 2017-018-019629 LMP Laser polishing Additive Manufacturing Microstructure Evolution
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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