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A study on surface morphology and tension in laser powder bed fusion of Ti-6Al-4V

Khorasani, Mahyar, Ghasemi, AmirHossein, Awan, Umar Shafique, Hadavi, Elahe, Leary, Martin, Brandt, Milan, Littlefair, Guy, O’Neil, William and Gibson, Ian 2020, A study on surface morphology and tension in laser powder bed fusion of Ti-6Al-4V, International Journal of Advanced Manufacturing Technology, vol. 111, pp. 2891-2909, doi: 10.1007/s00170-020-06221-w.

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Title A study on surface morphology and tension in laser powder bed fusion of Ti-6Al-4V
Author(s) Khorasani, Mahyar
Ghasemi, AmirHossein
Awan, Umar Shafique
Hadavi, Elahe
Leary, Martin
Brandt, Milan
Littlefair, Guy
O’Neil, William
Gibson, IanORCID iD for Gibson, Ian orcid.org/0000-0002-4149-9122
Journal name International Journal of Advanced Manufacturing Technology
Volume number 111
Start page 2891
End page 2909
Total pages 19
Publisher Springer
Place of publication Berlin, Germany
Publication date 2020
ISSN 0178-0026
1433-3015
Keyword(s) Additive manufacturing
Selective laser melting
Surfacemorphology
Surface roughness
Porosity
Summary When reporting surface quality, the roughest surface is a reference for the measurements. In LPBF due to recoil pressure and scan movement, asymmetric surface is shaped, and surface roughness has different values in different measurement orientations. In this research, the influence of the laser powder bed fusion (LPBF) process parameters on surface tension and roughness of Ti-6AI-4 V parts in three orientations are investigated. To improve the mechanical properties, heat treatment was carried out and added to the designed matrix to generate a comprehensive data set. Taguchi design of experiment was employed to print 25 samples with five process parameters and post-processing. The effect and interaction of the parameters on the formation of surface profile comprising tension, morphology and roughness in various directions have been analysed. The main contribution of this paper is developing a model to approximate the melting pool temperature and surface tension based on the process parameters. Other contributions are an analysis of process parameters to determine the formation and variation of surface tension and roughness and explain the governing mechanisms through rheological phenomena. Results showed that the main driving factors in the variation of surface tension and formation of the surface profile are thermophysical properties of the feedstock, rheology and the temperature of the melting pool. Also, the results showed that while the value of surface tension is the same for each test case, morphology and the value of roughness are different when analysing the surface in perpendicular, parallel and angled directions to laser movement.
Language eng
DOI 10.1007/s00170-020-06221-w
Indigenous content off
Field of Research 01 Mathematical Sciences
08 Information and Computing Sciences
09 Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30145281

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.