MSE Seminar: Jonathan Orsborn, Simulation of Solid-State Weld Microstructures Using Thermal and Thermo-Mechanical Exposures in Ti-5Al-2Sn-2Zr-4Cr-4Mo

Abstract

Solid-state welding techniques, such as linear friction welding and inertia friction welding are gaining favor as methods for joining all sorts of alloys, particularly those which are not easily joined via other methods. These processes expose alloys to very rapid heating rates to high temperatures, short hold times, large and varying amounts of hot deformation, and fast cooling rates. Due to the extreme, dynamic nature of the process, the exact conditions (heating rate, maximum temperature, strain, etc.) are not known, nor are they readily measured. Comparison of weld microstructures to microstructures produced by known, controlled processing conditions can allow the actual weld conditions to be deduced. In this study, a Gleeble™ 3500 was used to simulate weld microstructures in Ti-5Al-2Sn-2Zr-4Cr-4Mo, or Ti-17, by exposing the alloy to various thermal and thermo-mechanical conditions, similar to those which likely occur in a solid state weld. These simulated microstructures, along with microstructures from actual Ti-17 solid-state welds, were characterized using SEM, EBSD, TEM, STEM, and EDXS. The current results of this work will be presented and discussed.

Bio

Jonathan Orsborn received his Bachelor of Science, in Materials Science and Engineering, from the Ohio State University in 2008. He has been in graduate school since then, and began working as an SEM instrument manager, at the Center for Electron Microscopy and Analysis, in 2014.