Effect of High Temperature on Ti-6Al-4V Annealed Material Tensile Properties Between 900°F and 1800°F

MMPDS contains data showing the effects of temperature on tensile ultimate strength (Ftu) and yield strength (Fty) up to 1000°F for titanium Ti-6Al-4V annealed material. Some Gulfstream aircraft families have engine mounts manufactured from forged Ti-6Al-4V annealed titanium per AMS4928. As part of a compliance effort for fire protection of these parts, it was decided to test the effect of temperature on Ti-6Al-4V tensile properties between 900°F and 1800°F. Since this testing is designed to substantiate fire protection, the heating profile and time at temperature was based on experimental data representative of an engine fire in lieu of ASTM E21 recommendations. An external lab conducted a unique set-up, execution of the heating profile, and testing of the specimens to replicate the expected temperature exposure. Test results from each lot were averaged and normalized to a percentage of room temperature for ultimate tensile strength and yield strength. Additionally, an elevated temperature curve from 900°F to 1800°F was generated. The test methodologies and the results of this testing will be discussed during this presentation.