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A comparative study of laser direct metal deposition characteristics using gas and plasma-atomized Ti-6Al-4V powders

Ahsan, M. Naveed and Pinkerton, Andrew J. and Moat, Richard J. and Shackleton, Judith (2011) A comparative study of laser direct metal deposition characteristics using gas and plasma-atomized Ti-6Al-4V powders. Materials Science and Engineering: A, 528 (25-26). pp. 7648-7657. ISSN 0921-5093

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Abstract

This research presents a comparative study of the characteristics of laser direct metal deposition (LDMD) using two types of Ti-6Al-4V powder. Ti-6Al-4V powders prepared using the gas-atomization (GA) and the plasma rotating electrode (PREP) processes were first analyzed using laser diffraction, scanning electron microscopy and micro computed tomography. A 1.5 kW diode laser with a coaxial deposition head was then used to deposit a number of thin-wall structures at a range of processing parameters from each of the powders. The deposited structures were characterized using optical microscopy, scanning electron microscopy. X-ray diffraction and micro computed tomography (MicroCT). The results show some potential benefits of using PREP powder in laser direct metal deposition. PREP powder has a higher deposition rate and deposits show lower intralayer porosity and lower surface roughness. In both cases, deposits of Ti-6Al-4V exhibit a unique epitaxial prior beta grains microstructure that transforms to alpha lathes and retained beta during cooling. X-ray diffraction results show that the overall microstructure is alpha + beta and not martensitic. The lamellar alpha + beta phase spacing (S alpha+beta) increases with laser power but seems unaffected by variation in the mass flow rate of the powder. Micro hardness of the laser deposited Ti-6Al-4V is dependent on the lamellar alpha + beta phase spacing (S alpha+beta) and PREP powder deposits show lower micro hardness than GA powder deposits. (C) 2011 Elsevier B.V. All rights reserved.

Item Type: Article
Journal or Publication Title: Materials Science and Engineering: A
Uncontrolled Keywords: Laser direct metal deposition ; Micro computed tomography ; PREP powder ; Microstructure ; Micro hardness
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 59502
Deposited By: ep_importer_pure
Deposited On: 26 Oct 2012 15:10
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:34
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/59502

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