|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||The Effect of Dwell on Fatigue Crack Growth in a Ti-6Al-2Sn-4Zr-6Mo Alloy
||Georgia Mills, Hangyue Li, S. Williams, P. Bowen
|On-Site Speaker (Planned)
Ti6246 is a high strength titanium alloy used for compressor discs in aeroengines. Due to prolonged stressing associated with engine operating cycles, it is important to understand the effects of dwell on crack growth behaviour at elevated temperatures, which is currently lacking. This programme concentrates on dwell fatigue crack growth, together with a comprehensive study on fatigue threshold, Paris regime fatigue crack growth and the influence of environment. Specimens have been tested at temperatures of 20oC, 500oC and 575oC. Both baseline frequency of 0.25Hz and dwell periods of 1 hour have been adopted in air and vacuum. This methodology allows different failure mechanisms to be isolated and defined. It is observed that there is an increase of 2-3 times in fatigue crack growth rate under 1 hour dwell at a temperature of 500„aC. Significant creep damage is observed at 575„aC. A noticeable impact of air environment is confirmed.
||Planned: Supplemental Proceedings volume