HIGH CYCLE FATIGUE PERFORMANCE OF TI6AL4V(ELI) SPECIMENS PRODUCED WITH INHERENT LASER POWDER BED FUSION SURFACE ROUGHNESS

Authors

  • Hlakae Patrick Miya Department of Mechanical and Mechatronics Engineering Central University of Technology, Free State
  • Willie Bouwer du Preez Department of Mechanical and Mechatronics Engineering Central University of Technology, Free State http://orcid.org/0000-0001-9935-7330
  • Lehlohonolo Francis Monaheng Department of Mechanical and Mechatronics Engineering Central University of Technology, Free State

DOI:

https://doi.org/10.7166/32-3-2659

Keywords:

High cycle fatigue, LPBF, Ti6Al4V, Surface roughness

Abstract

This study investigated how surface defects affect the fatigue performance of laser powder bed fusion (LPBF) Ti6Al4V(ELI) test specimens in as-built surface roughness and heat-treated conditions. Tensile and fatigue specimens were built in three orthogonal directions for testing. Fatigue testing was carried out to determine the maximum stress at which a run-out number of 5 million cycles to failure could be achieved. Fractured specimens were analysed and compared for crack initiation and propagation characteristics using scanning electron microscopy. Conclusions were drawn on the possibility of producing Ti6Al4V(ELI) aircraft components through LPBF.

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Author Biographies

Hlakae Patrick Miya, Department of Mechanical and Mechatronics Engineering Central University of Technology, Free State

Master's student

Department of Mechanical and Mechatronics Engineering

Willie Bouwer du Preez, Department of Mechanical and Mechatronics Engineering Central University of Technology, Free State

Visiting Professor

Department of Mechanical and Mechatronics Engineering

Lehlohonolo Francis Monaheng, Department of Mechanical and Mechatronics Engineering Central University of Technology, Free State

Lecturer

Department of Mechanical and Mechatronics Engineering

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Published

2021-11-29

How to Cite

Miya, H. P., du Preez, W. B., & Monaheng, L. F. (2021). HIGH CYCLE FATIGUE PERFORMANCE OF TI6AL4V(ELI) SPECIMENS PRODUCED WITH INHERENT LASER POWDER BED FUSION SURFACE ROUGHNESS. The South African Journal of Industrial Engineering, 32(3), 248–257. https://doi.org/10.7166/32-3-2659

Issue

Vol. 32 No. 3 (2021)

Section

Special Edition

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