|About this Abstract
||Materials Science & Technology 2020
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||Deformation-free Refinement of Prior β Grain Size in Powder Metallurgical Titanium Alloys
||Daniel O. Lewis, James D Paramore, Brady Butler, Griffin Turner, Trevor Hastings
|On-Site Speaker (Planned)
||Daniel O. Lewis
Due to high cost of titanium alloys, there is a significant incentive to develop near net shape processes to improve utilization of titanium, such as powder metallurgy (PM). However, titanium PM often results in parts with a coarse microstructure, which compromises mechanical properties when compared to traditionally produced wrought parts. One method of creating PM titanium parts with fine microstructures and wrought-like properties is Hydrogen Sintering and Phase Transformation (HSPT). HSPT has been shown to produce excellent tensile and fatigue properties, but has a hierarchical structure with coarse prior β grains, which may limit performance. This study aimed to examine non-deformation-based means to refine the prior β grains in order to further improve mechanical properties. To this end, various quenching and heat treatments were incorporated into HSPT. Additionally, thorough characterization of microstructure and mechanical behavior were used to evaluate the efficacy of these processing methodologies.