Investigation of Metallurgical and Microhardness Properties of Titanium Alloy in Laser Metal Deposition Process
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Date
2017
Authors
Mahamood, R.M
Abdulkareem, S
Ajao, K.R
Aweda, J.O
Journal Title
Journal ISSN
Volume Title
Publisher
University of Lagos Press, Akoka
Abstract
This paper reports on the investigation of metallurgical and microhardness properties of laser metal deposition of Titanium alloy- Ti-6Al-4V. Ti-6Al-4V substrate and Ti-6Al-4V powder (150-200 μm) both at 99.6% purity were used in this study. The input laser power varied between 0.8 and 4.0 kW while other processing parameters were kept constant. They include the scanning speed of 0.005 m/sec, powder flow of 1.44 g/min and the gas flow rate of 4 l /min. The microstructure and the microhardness were examined under the optical and scanning electron microscope. The microhardness was measured using the Vickers hardness tester. The study revealed that the layer band occurred in all the samples except those samples at very high laser powers. The microstructure of the heat affected zone is characterized with fine globular primary alpha and beta grains at low laser power and become coarse as the laser power was increased. The microhardness was found to initially increase and then decrease as the laser power was increased beyond 3 kW.
Description
Journal Articles
Keywords
Metal Deposition Process , Laser power , Macroscopic Banding , Microhardness , Microstructure
Citation
Mahamood, R.M, Abdulkareem, S, Ajao, K.R and Aweda, J.O (2017). Investigation of Metallurgical and Microhardness Properties of Titanium Alloy in Laser Metal Deposition Process. Unilag Journal of Medicine, Science and Technology, Vol.5(2), 55-71p.