Invited Speaker

Dr. Swee Leong Sing

Dr. Swee Leong Sing

Department of Mechanical Engineering, National University of Singapore, Singapore
Speech Title: In-situ Alloying using Powder Bed Fusion Additive Manufacturing

Abstract: Currently, pre-alloyed powders are typically used in metal additive manufacturing (AM). AM, or commonly known as 3D printing, has been using materials that are designed for other fabrication processes. These established materials face challenges in AM due to the unique characteristics and phenomena that occur within the processes. Furthermore, pre-alloyed powders are expensive and inflexible in terms of composition. In-situ alloying, which makes use of powder blends, enables highthroughput experimental alloy design and screening. This production approach allows high flexibility in varying the composition.

For bulk production, laser powder bed fusion (L-PBF) of elemental powder blends was used as proof of concept. The in-situ alloyed produced materials are promising materials for wide range of applications due to their superior properties, even when compared to established materials. In-situ alloying has been shown to be an effective approach in creating these new alloys. The material processed were characterised using optical microscopy, electron backscatter diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, hardness and tensile testing.

Biography: Dr. S. L. Sing was a Presidential Postdoctoral Fellow at the Singapore Centre for 3D Printing, Nanyang Technological University, Singapore. Now he has newly joined Department of Mechanical Engineering, National University of Singapore, Singapore. His research interest is using advanced manufacturing techniques as enablers for materials development and to create strategic values for the industry. He is actively involved in inter-disciplinary research. In 2020, Swee Leong is awarded the prestigious NTU Presidential Postdoctoral Fellowship to carry out independent research.

Dr. Sing obtained his PhD in Mechanical Engineering, in 2016 from Nanyang Technological University, Singapore. His doctoral thesis focuses on laser powder bed fusion processing of a novel titanium alloy for medical applications. The doctoral thesis and related research are awarded the Best PhD Thesis Award by the School as well as Springer Theses Award in 2017. Based on Web of Science (Clarivate Analytics), he has co-authored 46 peer reviewed articles in the field of additive manufacturing or 3D printing. He currently has a h-index of 25 and is also the co-inventors for multiple patents on additive manufacturing.