|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advances in Additive Manufacturing of Titanium and Titanium Based Alloys
||Tuning Microstructural Evolution in Additively Manufactured Ti Alloys Using High throughput Experimental Approaches
||Brian Welk, Kevin Chaput, Samuel Kuhr, Hamish Fraser
|On-Site Speaker (Planned)
Defects associated with the additive manufacturing (AM) of metallic alloys include porosity and residual stresses, and, especially in Ti alloys, the tendency to form coarse columnar microstructures parallel to the growth/deposition direction which lead to anisotropic mechanical properties. In the present research, the emphasis has been on the use of alloying to effect an equiaxed microstructure through modification of the solidification mechanism. Here, alloying has been used to increase the undercooling prior to solidification, with the result that a columnar to equiaxed (CET) transition is realized. The experiments involved using a combinatorial approach, where a LENS™ AM device has been used to produce variations in the minor alloying elements of interest, such that changes in microstructure can be directly related to changes in composition. The results of these experiments will be compared and contrasted with “standard” AM processing of conventional alloys (e.g., Ti-6-4). This research has been supported by AFRL/RX.
||Planned: Supplemental Proceedings volume