| Issue |
MATEC Web Conf.
Volume 388, 2023
2023 RAPDASA-RobMech-PRASA-AMI Conference Advanced Manufacturing Beyond Borders - The 24th Annual International RAPDASA Conference joined by RobMech, PRASA and AMI, hosted by CSIR and CUT
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| Article Number | 03015 | |
| Number of page(s) | 11 | |
| Section | Material Development | |
| DOI | https://doi.org/10.1051/matecconf/202338803015 | |
| Published online | 15 December 2023 | |
Investigation of TiB distribution characteristics on the microstructure of in situ TiB/Ti6Al4V-ELI manufactured by laser metal deposition
1 CSIR Photonics Centre, Manufacturing Cluster, P O Box 395, Pretoria 0001, South Africa
2 University of Johannesburg, Mechanical Engineering Science Department, Johannesburg 2012, South Africa
3 University of Pretoria, Material Science and Metallurgical Engineering Department, Pretoria, South Africa
This study presents the investigation of TiB distribution characteristics on the microstructure of in-situ synthesized TiB/Ti6Al4V single-track composites manufacture with laser metal deposition. Ti6Al4V alloy was reinforced by adding TiB2 ceramic at mass volumes of 0%, 1% and 2% for microstructure modification and mechanical properties enhancement. The TiB/Ti6Al4V composite was characterized using optical microscope (OM), scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and microhardness. It was found that the addition of TiB2 resulted in the transformation of the prior β-grain into two types of morphologies of dendritic and columnar microstructures. Furthermore, the increase in the amount of TiB2 resulted in the reduction of the volume fraction of β-Ti phase, with the in situ formed TiB replacing and occupying the β-Ti positions. Deposition at 2% promoted the formation of unmelted TiB2 particles which promoted hardness increase to 496 ± 17 HV.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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