Lekoadi, Paul MasekuruTlotleng, MonnammeAnnan, Kofi AhomkahMaledi, NthabisengMasina, Bathusile2022-05-202022-05-202021-02-03Lekoadi, P.; Tlotleng, M.; Annan, K.; Maledi, N.; Masina, B. Evaluation of Heat Treatment Parameters on Microstructure and Hardness Properties of High-Speed Selective Laser Melted Ti6Al4V. Metals 2021, 11, 255. https://DOI.org/10.3390/met11020255.2075-470110.3390/met11020255https://repository.up.ac.za/handle/2263/85591This study presents the investigation on how heat treatment parameters, which are temperature, cooling method, and residence time, influence the microstructural and hardness properties of Ti6Al4V components produced on Ti6Al4V substrate using high speed selective laser melting technique. Heat treatment was performed on the produced samples before they were characterized for microstructure and hardness. The microstructure of the as-built sample contained large columnar-grains that were filled with martensite ’ phase and had a high hardness of 383 13 HV. At 1000 C and residence time of maximum 4 h, better heat treatment parameters were seen for the selective laser melting (SLM) produced Ti6Al4V sample since an improved lamellar + microstructure was obtained at this condition. This microstructure is known to have improved tensile properties.en© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.Heat treatmentTemperatureCooling methodResidence timeMicrostructureHardnessSelective laser melting (SLM)Engineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionArticle