Heat Treatment Strategies to Improve the Quasi-Static and Dynamic Performance of Alpha + Beta Titanium Alloys

Boostani, A. F., Mujahid, S., Oppedal, A. L., Krivanec, C., Whittington, W. R., Allison, P. G., Bhattacharyya, J. J., Agnew, S. R., & El Kadiri, H. (2019). Heat Treatment Strategies to Improve the Quasi-Static and Dynamic Performance of Alpha + Beta Titanium Alloys. TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings. San Antonio, TX: Springer, Cham. DOI:10.1007/978-3-030-05861-6_131.

Although most studies have been concentrated on the quasi-static performance of alpha+beta titanium alloys, the dynamic performance of them especially in the intermediate regime is in its infancy. In this study, we conducted different rapid heating and cooling treatments (RHCT) on TIMETAL 64 (alpha+beta, 6 Al, 4 V) and TIMETAL 639 (alpha+beta, 6.5 Al, 1.7 Mo, 1.7 V, 0.3 Si). The resulting microstructure was characterized using electron backscattered diffraction (EBSD) before and after the RHCT process. To correlate the effect of proposed RHCT on the quasi-static (10-3/s), and intermediate (100/s) behavior of the heat-treated samples, we utilized the compression and split Hopkinson pressure bar (SHPB) tests, respectively, to compress the specimens. Results have demonstrated that the dynamic ductility of the TIMETAL 639 outperforms the one of the TIMETAL 64, attributed to the bimodal microstructure of the TIMETAL 639.