Dr. Sameehan S. Joshi, Research Assistant Professor in Materials Science and Engineering, University of North Texas, will give a seminar titled "Decoding Complex Thermokinetics Driven Microstructure Evolution Pathways in Additively Manufactured Materials" to the interested students and faculty at Discovery Park.

Abstract

Additive manufacturing provides exciting possibilities of producing near net shaped components with disruptive design methodologies. At the same time, additive techniques can be employed to repair conventionally manufactured parts. However, additive manufacturing is associated with occurrence of spatially and temporally varying complex thermokinetic phenomena which dictate the possible microstructure evolution pathways as well as consequent property response. Experimental probing of such complex phenomena using in-situ techniques is difficult because of short (~ms) heat source-feed material interaction times and small interaction volumes involved during additive manufacturing. In view of this, a comprehensive integrated experimental-computational framework has been developed to predict and correlate site specific thermokinetic phenomena (e.g. thermal histories, solidification rates, and morphological factors) with observed spatially varying multiscale microstructures in additively produced materials. Physics driven control of process and resultant microstructures is demonstrated in the case of laser directed energy deposition, laser surface engineering, and solid-state additive manufacturing methods using the developed approach.

Biography

Dr. Sameehan S. Joshi completed his Ph.D. in Materials Science and Engineering from the University of North Texas in 2017 where he analyzed a variety of laser processed structural materials using an integrated experimental and computational approach. He employed laser processing in applications such as synthesis of surface coatings, laser aided machining, and additive manufacturing. Prior to Ph.D., Dr. Joshi did his master’s in Materials Engineering from the Indian Institute of Science, Bangalore, India in 2012 where his research focused on development of squeeze cast structural magnesium alloys. He completed bachelor’s in Metallurgical Engineering from College of Engineering Pune, India in 2009. Dr. Joshi is currently working as a Research Assistant Professor in the Center for Agile and Adaptive Additive Manufacturing at the University of North Texas. He has also worked as a Senior Metallurgical Engineer in automobile industry mainly focusing on laser and binder based additive manufacturing techniques to produce automotive components. Till date he has co-authored 1 book, 3 book chapters in ASM Handbook Series, 5 review articles, and 34 peer reviewed journal papers related to advanced materials processing.