Effect of Heat Treatment Processing on the Dynamic Performance of Alpha+Beta and Metastable-Beta Titanium Alloys

Mujahid, S., Krivanec, C., Oppedal, A. L., Whittington, W. R., Allison, P., Boostani, A. F., Bhattacharyya, J. J., Agnew, S., & El Kadiri, H. (2018). Effect of Heat Treatment Processing on the Dynamic Performance of Alpha+Beta and Metastable-Beta Titanium Alloys. Proceedings of the 2018 SEM Annual Conference and Exposition. Greenville, SC: Society for Experimental Mechanics.

Titanium alloys are important for a wide range of applications especially where their high strength to weight ratio is valued. Although the effect of processing conditions on the mechanical performance have been well documented, there is limited information about the specific effect of heat treatment schedules on the impact resistance of titanium alloys. In this study, we performed several aging schedules on TIMETAL 639 (alpha+beta, 6.5 Al, 1.7 Mo, 1.7 V, 0.3 Si) and TIMETAL 18 (metastable beta, 0.5 Al, 5.0 Mo, 5.0 V, 2.3 Cr, 0.8 Fe, 0.14 O) and characterize the resulting microstructure with electron back scattered diffraction (EBSD) before and after deformation. The alpha+beta/near alpha titanium alloys are one of the most important titanium alloys as they offer a good combination of mechanical resistance, fracture toughness, and corrosion resistance. This study targets to conduct appropriate heat treatment protocol to enhance strength and ductility of TIMETAL 639 and TIMETAL 18 for applications which need high impact resistance.