| Issue |
MATEC Web Conf.
Volume 370, 2022
2022 RAPDASA-RobMech-PRASA-CoSAAMI Conference - Digital Technology in Product Development - The 23rd Annual International RAPDASA Conference joined by RobMech, PRASA and CoSAAMI
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|---|---|---|
| Article Number | 11003 | |
| Number of page(s) | 14 | |
| Section | AM Post Processing & Qualification | |
| DOI | https://doi.org/10.1051/matecconf/202237011003 | |
| Published online | 01 December 2022 | |
Effect of heat treatment on microstructure, hardness and tensile properties of high-speed selective laser melted Ti6Al4V
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
4 University of the Witwatersrand, School of Chemical and Metallurgical Engineering, Johannesburg, Private Bag X3, 2050, South Africa
This study presents the investigation of the influence of heat treatment on microstructure, hardness and tensile properties of high-speed selective laser melted Ti6Al4V components. Heat treatment was performed to obtain an improved microstructure with enhanced hardness and tensile properties. It was found that the acicular martensitic α′ structure on the as-built sample lead to high hardness, yield strength and ultimate tensile strengths of 389±10 HV0.3, 949 ± 10 MPa and 1045 ± 3 MPa, respectively,with a low ductility of 5%. Heat treatment transformed the martensitic α′ structure into lamella α + β phases, with heat treatment at 1000 °C resultingin the most improved hardness and ductility from 389 ± 10 HV0.3 and 5% to 325 ± 20 HV0.3 and 13%, and a decrease in yield and ultimate tensile strength from 949 ± 10 MPa and 1045 ± 13MPa to 835 ± 11 MPa and 911 ± 5 MPa, respectively.
© The Authors, published by EDP Sciences, 2022
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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