Selective laser melting produced Ti-6Al-4V : post-process heat treatments to achieve superior tensile properties

Ter Haar, Gerrit M. ; Becker, Thorsten H. (2018)

CITATION: Ter Haar, G. M. & Becker, T. H. 2018. Selective laser melting produced Ti-6Al-4V : post-process heat treatments to achieve superior tensile properties. Materials, 11(1):146, doi:10.3390/ma11010146.

The original publication is available at https://www.mdpi.com

Article

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.

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