Dr Hao Wang is an Assistant Professor at the Department of Mechanical Engineering, National University of Singapore. He is an Alexander von Humboldt fellow (Germany), JSPS fellow (Japan) and visiting professor at Sorbonne Paris North University and Université Toulouse III - Paul Sabatier, France.

Dr Wang has a persistent dedication to research in the physics of ultraprecision microcutting, additive manufacturing, and intelligent manufacturing. His research themes are centralised on pushing the envelope of state-of-the-art precision machining and bridging the gap between additive manufacturing and ultra-precision machining technology. Dr Wang has published over 150 peer-reviewed papers in renowned journals including Nature, Advanced Functional Materials, Additive Manufacturing, International Journal of Machine Tools and Manufacture, etc. He currently serves as an international scientific committee member of The European Society for Precision Engineering and Nanotechnology (euspen), Chairman-elect of The American Society of Mechanical Engineers (ASME) Singapore Section, Associate Editor for the Journal of Intelligent Manufacturing, Youth Editor for the International Journal of Extreme Manufacturing, Co-Editor-in-Chief of Journal of Advanced Manufacturing Systems, editorial board member of Journal of Materials Processing Technology.

Topic title: Enhancing the Precision of Metal Additive Manufacturing with Ultraprecision Machining Enhanced by Mechanochemical Effect

Abstract:

Additive Manufacturing (AM) technology offers an efficient solution for producing functional parts with intricate structures and exploring novel materials. However, the widespread application of AMed parts is impeded by the inherent challenges of poor surface quality and limited dimensional accuracy. Consequently, post-processing and/or in-situ additive/subtractive processes become indispensable. The challenging machinability characteristics of additively manufactured metal parts further hinder quality improvement.

This presentation covers our recent investigation focused on the machinability of additively manufactured maraging steel. Our examination encompasses variations in microstructure and mechanical properties achieved through heat treatment and mechanochemical effects. Notably, the cutting forces in machining as-built and solution-treated SLMed samples exhibit a substantial reduction of up to ~53%. This breakthrough offers a promising avenue to enhance the machinability of additively manufactured metal parts. The findings from this study pave the way for improved integration and the closed-loop nature of additive/subtractive hybrid manufacturing systems.