|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Fatigue Properties of Microstructural Gradients in Ti-6Al-4V Generated with Thermohydrogen Treatment
||Christopher David Schmidt, Hans-Jürgen Christ, Axel von Hehl
|On-Site Speaker (Planned)
||Christopher David Schmidt
Structural components must fulfil the demand of saving resources by lightweight design without losing reliability. Hence, improved processing techniques for commercial materials must be developed. One approach is to charge the Ti-6Al-4V temporarily with hydrogen (thermo-hydrogen treatment, THT) generating lattice distortion and hydrides. The resulting localized plastic deformation potentially triggers recrystallization and enables a finer microstructure than that which can be attained by a conventional heat treatment. The study presented aims at the design of a THT process that establishes a microstructure with a local change in distribution and morphology of strengthening precipitates and grain size as a function of the distance to surface (microstructural gradient).
To evaluate the mechanical properties of microstructural gradients produced in a previous work the resulting Wöhler curves were determined by stress-controlled cyclic deformation tests. The results show that H-charging at 500°C and H-degassing at 750°C improves the fatigue properties compared to a reference condition.
||Titanium, Process Technology, Mechanical Properties