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Spring 2009 Seminar Series
Friday, May 29, at 3:30 p.m.
Room 264 MacQuigg Labs
Badri Narayanan
PhD Candidate advised by Dr. Michael Mills
Department of Materials Science and Engineering
The Ohio State University
Effect of Alloying on Precipitate Evolution in Ferritic Weld Metal
Abstract
The effect of alloying on the microstructure of ferritic weld metal produced with an self-shielded flux cored arc welding process (FCAW-S) has been studied. The welding electrode has a flux core that is intentionally alloyed with strong deoxidizers and denitriding elements such as aluminum, titanium and zirconium.The work focuses on characterization of the microstructures and the precipitates formed during solidification.Scanning Transmission Electron Microscopy (STEM) in conjunction with Energy Dispersive Spectroscopy (EDS) and Electron energy loss spectroscopy (EELS) was used to study the effect of micro-alloying additions on inclusion evolution.The formation of core-shell structure of oxide/nitride is identified as being key to improvement in toughness of the weld metal.
This work is supported by The Lincoln Electric Company, Cleveland,OH.
Bio
Badri received his Masters in Materials Science and Engineering in 2000 from OSU and has been working in Cleveland,OH for The Lincoln Electric Company in their Research and Development division. His work involves the development of new consumables for joining high strength steels. He came back to OSU to complete his PhD in 2006. His interests include arc welding, phase transformations and anything metals. His aspirations include teaching, understanding phase transformations in non-equilibrium processes, and development of statistically strong techniques to quantify microstructures using electron microscopy. He spends his free time volunteering for groups involved in education-based grass-root development projects in India.
