|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Recrystallization and Phase Transformations in Linear Friction Welded Ti-64 and Ti-17 Alloys
||Riddhiman Bhattacharya, John Allison
|On-Site Speaker (Planned)
Linear / Translational Friction Welding (LFW) is a solid state joining process used in manufacturing Bladed Disks (BLISKS) for aerospace applications. The thermo-mechanical conditions realized in this process facilitate dynamic recrystallization (DRX) and phase transformations. In this work, thermo-mechanical conditions, typically encountered in a LFW process, are used to systematically study the microstructural evolution mechanisms in Ti-64 and Ti-17. Parent alloys are subjected to rapid heating conditions and short transients using a Gleeble® thermomechanical simulator, coupled with Scanning Electron Microscopy (SEM) / Electron Back Scatter Diffraction (EBSD) characterizations. Volume fractions of recrystallized and transformed grains are determined using a Grain Orientation Spread (GOS) analysis. Non-equilibrium phases (also known as ghosts) that form due to the short thermal transients, are characterized using Back Scattered Electron (BSE) imaging in a SEM. The experimental results are used to calibrate multiscale models, as part of an Integrated Computational Materials Engineering (ICME) framework.
||Planned: Supplemental Proceedings volume