Influence of selective laser melting scanning speed parameter on the surface morphology, surface roughness, and micropor
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FOCUS ISSUE
ADDITIVE MANUFACTURING OF METALS: COMPLEX MICROSTRUCTURES AND ARCHITECTURE DESIGN
Influence of selective laser melting scanning speed parameter on the surface morphology, surface roughness, and micropores for manufactured Ti6Al4V parts Mohd Faizal Sadali1,a) Zainudin A Rasid2
, Mohamad Zaki Hassan1,b)
, Fauzan Ahmad2, Hafizal Yahaya2,
1
Razak Faculty of Technology and Informatics, Universiti Teknologi Malaysia, Kuala Lumpur 54100, Malaysia Malaysian Japanese International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur 54100, Malaysia a) Address all correspondence to these authors. e-mail: [email protected] b) e-mail: [email protected] 2
Received: 30 December 2019; accepted: 23 March 2020
Selective laser melting (SLM) is a state-of-the-art technology in the additive manufacturing field. This study focuses on the influence of scanning speed on the fabrication of Ti6Al4V samples produced by SLM. This article contributes to the effect of SLM scanning speed parameters on micropores, surface morphology, and roughness. The detailed characterizations for the parts produced by the SLM process are evaluated. An SLM scanning speed of 695, 775, or 853 mm/s was selected. The findings show that a high quality of surface morphology and microstructure is obtained at a scanning speed of 775 mm/s. In addition, the maximum surface roughness values for both upper and side surfaces are approximately 0.460 lm and 0.592 lm, respectively. Furthermore, surface defect characteristics regarding the speed mechanism parameter for the SLM system are also discussed, and the challenges to the part quality, and potential for numerous industries (e.g., aerospace, automotive, and biomedical), creating microstructures, are observed.
Introduction Additive manufacturing (AM) technology is a layer-by-layer process of fabrication of 3D parts directly from computer-aided design (CAD) models. This technology provides a wide range of advantages including lower production time, higher material utilization, almost no geometric constraints, and no waste material as compared with the conventional manufacturing methods. Among AM technologies, selective laser melting is one of the common techniques where components can be net-shaped and formed directly from metal powder via virtual slicing of a 3D shape, in the form of a CAD file, into a sequence of twodimensional slices [1]. Currently, the Ti6Al4V powder alloy is most widely used in the selective laser melting (SLM) technique, it promises high-temperature titanium alloy, and is considered stronger than some other titanium compounds [2]. Besides its excellent specific strength, low density, and interesting mechanical properties, using it to make high-performance parts is entirely reasonable [3]. It has been broadly used in the aerospace, military, space, medical implant, and automotive industries [4].
ª Materials Research Society 2020
Various indirect and direct parameters which influence the SLM process have been studied. The main parameters in SLM are scanning spee
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