Title：Mechanical and corrosion properties of stainless steels additively manufactured using the binder jet printing technique
Invitated Speaker：Prof. Upadrasta Ramamurty
TIME：10:00am，June 18th，2025
时间：2025年6月18日 上午10:00
Location：Iharbour 3-2012-3-2014
地点：创新港3号巨构躬行楼（3-2012~3-2014）
Bio：Professor Upadrasta Ramamurty obtained a PhD degree in 1994 from Brown University, USA. After post-doctoral work at the University of California – Santa Barbara and the Massachusetts Institute of Technology, he held faculty positions at the Nanyang Technological University, Singapore and the Indian Institute of Science, Bangalore, India, before returning to NTU in 2018. His research interests include deformation and fracture behaviour of amorphous as well as crystalline alloys, additive manufacturing, and the development and application of the nanoindentation technique. He co-authored 411 papers in peer reviewed international journals (~29,000 citations with a current h-index of 90) and is an editor of Acta Materialia and Scripta Materialia. He is an elected Fellow of both the National Academies of Engineering and Sciences of India, and TWAS-The World Academy of Sciences.
Abstract：Currently, there is considerable scientific as well as technological interest in additive manufacturing (AM) of alloys. The lion’s share of the research work has been on techniques such as the laser powder bed fusion (LPBF). Binder jet printing (BJP)—in spite of being relatively less expensive—has not received as much attention. In the recent past, we have investigated the microstructures, mechanical properties (including fatigue and fracture responses), and corrosion and stress corrosion cracking resistances of two common stainless steels (316L and 17-4 PH) that are produced using the BJP technique, and compared them with those produced using conventional manufacturing (casting followed by high temperature thermo-mechanical processing) and the LPBF techniques. In general, the porosity levels in the as-sintered BJP alloys tend to be relatively high, which mandates the additional post-processing step of hot isostatic pressing (HIP). Our studies also include HIP samples, to critically ascertain its utility. Many of the results are surprising and belie the expectations from the conventional and well-established structure – property correlations. I shall describe them in this talk, with the hope to enthuse interested researcher to pursue the BJP alloys.
