Influence of processing parameters on density, surface morphologies and hardness of as-built Ti-5Al-5Mo-5V-3Cr alloy manufactured by selective laser melting
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Mansur Ahmed, Muhannad A.Obeidi, Shuo Yin, Rocco Lupoi, Influence of processing parameters on density, surface morphologies and hardness of as-built Ti-5Al-5Mo-5V-3Cr alloy manufactured by selective laser melting, Journal of Alloys and Compounds, 2022, 910, 164760Download Item:
Abstract:
Demand for new Ti alloys for AM is immense. Ti–5Al–5Mo–5V–3Cr (wt%), a β type Ti alloy is chosen for this
study as it possesses excellent properties. Samples are manufactured using SLM technique. Relative density,
surface morphologies and hardness of samples produced by varying laser processing parameters, e.g., laser
scan speed and laser power, are thoroughly investigated. Top surface of the as-built samples shows adhered
powder particles and discontinuous ripple patterns. A change in scan speed from 1200 to 1400 mm.s-1
drastically deteriorates top surface quality in terms of ripples patterns and adhered powders. Surface
roughness (Sa/Ra) of the side surface of the produced samples shows a value of below 20 μm. Side surfaces
show adhered powder particles, open surface pores, microcrack and interlayer crack. Substantial increase in
adhered powder particles is evident when both laser power and laser scan speed are increased distinctively.
These results are discussed with the help of the thermodynamic and metallurgical phenomena involved in
the SLM processing. Hardness of the as-built samples is measured, the value is in agreement with con-
ventional processing. This fundamental study will be useful for producing Ti-5553 alloy AM parts with
optimum surface.
© 2022 The Author(s). Published by Elsevier B.V.
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1. Introduction
Ti–5Al–5Mo–5V–3Cr (wt%) (Ti-5553) is a near β Ti alloy that has
a nominal density of 4.67 gm/cm3. It offers a very high strength,
good ductility, excellent corrosion resistance properties and proved
weldability [1–4]. The high strength and good ductility together
positively affect fatigue behaviour of Ti-5553 [5]. Due to excellent
hardenability, a second phase called hcp Ti phase (α-phase) pre-
cipitates from metastable bcc Ti phase (β-phase) during heat treat-
ment. As a result, a two-phase microstructure is achieved which can
displays very high ultimate tensile strength of 1.4 GPa. Because of
these properties, this alloy has been using in many engineering
applications especially aerospace (landing gear and airframe in
Boeing 787) and automotive industries [6]. In addition, a recent
study shows that it can be a potential candidate for biomedical ap-
plication especially in bone implantation [7].
Additive manufacturing (AM) technique has already shown a
great potential producing near net-shape components. As proven,
AM saves both material and machining cost. Selective laser melting
(SLM) is one of the popular AM processes that are extensively used
in metal applications [8,9]. It is a layer-by-layer technique where a
laser system consisting of high laser power is used for melting the
powder, and produces parts using the input CAD drawing. To date,
two Ti materials (CP Ti and Ti-6Al4V) have attracted significant re-
search interest. Besides, there are Ti alloys that are being used in
engineering applications. These motivate us to find new Ti alloys for
AM process. Due to the above mentioned excellent properties of Ti-
5553, this alloy is chosen for this study. A few studies has been re-
ported on this material focusing build up relationship between
processing, microstructure and mechanical properties [10–13].
Regardless of the application, surface of the SLM produced parts
is crucial for determining its properties, useability and feasibility.
Since this is a new in AM field, the surface morphologies of as-built
Ti-5553 alloy need to be thoroughly understood. The present study
aims to evolute the surface morphologies of as-built SLM Ti-5553
alloy with respect to laser processing parameters, such as laser
power and scanning speed.
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http://people.tcd.ie/lupoirhttp://people.tcd.ie/yins
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Author: Lupoi, Rocco; Yin, Shuo
Type of material:
Journal ArticleSeries/Report no:
Journal of Alloys and Compounds;910;
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Full text availableKeywords:
Ti alloys, SLM technique., discontinuous ripple patterns, Hardness, Laser processing parameter, Surface roughness, Surface morphologyDOI:
https://doi.org/10.1016/j.jallcom.2022.164760Metadata
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