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Materials 2018, 11(1), 146; https://doi.org/10.3390/ma11010146

Selective Laser Melting Produced Ti-6Al-4V: Post-Process Heat Treatments to Achieve Superior Tensile Properties

Materials Engineering Group, Department of Mechanical & Mechatronic Engineering, University of Stellenbosch, Stellenbosch 7600, South Africa
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Received: 9 November 2017 / Revised: 12 December 2017 / Accepted: 15 December 2017 / Published: 17 January 2018
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Abstract

Current post-process heat treatments applied to selective laser melting produced Ti-6Al-4V do not achieve the same microstructure and therefore superior tensile behaviour of thermomechanical processed wrought Ti-6Al-4V. Due to the growing demand for selective laser melting produced parts in industry, research and development towards improved mechanical properties is ongoing. This study is aimed at developing post-process annealing strategies to improve tensile behaviour of selective laser melting produced Ti-6Al-4V parts. Optical and electron microscopy was used to study α grain morphology as a function of annealing temperature, hold time and cooling rate. Quasi-static uniaxial tensile tests were used to measure tensile behaviour of different annealed parts. It was found that elongated α’/α grains can be fragmented into equiaxial grains through applying a high temperature annealing strategy. It is shown that bi-modal microstructures achieve a superior tensile ductility to current heat treated selective laser melting produced Ti-6Al-4V samples. View Full-Text
Keywords: additive manufacturing; powder bed fusion; selective laser melting; heat treatment; titanium alloys; phase transformation; tensile properties additive manufacturing; powder bed fusion; selective laser melting; heat treatment; titanium alloys; phase transformation; tensile properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ter Haar, G.M.; Becker, T.H. Selective Laser Melting Produced Ti-6Al-4V: Post-Process Heat Treatments to Achieve Superior Tensile Properties. Materials 2018, 11, 146.

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