|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Thermohydrogen Refinement of Microstructure of AM Titanium Components
||Michael Taylor Hurst, James Paramore, Brady Butler, Daniel Lewis, Laura Moody
|On-Site Speaker (Planned)
||Michael Taylor Hurst
Thermohydrogen refinement of microstructure (THRM) is a hydrogen-based heat treatment for titanium components, particularly well-suited to metal AM. Introduction of hydrogen into the Ti-6Al-4V system enables unique phase transformations and microstructural engineering. Additionally, hydrogen accelerates self-diffusion in transition metals, alloying defects (i.e. pores) to heal during the heat treatment without requiring applied pressure. Finally, hydrogen has a very high diffusion rate in titanium and the hydrogenation reaction is easily reversible, allowing subsequent removal to < 10 ppm H via a vacuum or inert gas anneal. THRM results in tunable fine-grained and wrought-like Ti-6Al-4V microstructures and isotropic mechanical properties (> 1 GPa strength and > 20 %EL) without requiring mechanical working. This deformation-free aspect makes the process particularly applicable to components created in near-net-shape processes. This talk will present results from applying THRM to Ti-6Al-4V components produced by various metal AM technologies.