|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Effect of C Addition on Creep and Microstructure Stability of Lamellar TiAl Alloys
||Xiwen Zhang, Ji Zhang, Jing Zhu
|On-Site Speaker (Planned)
Compared to the current applications, the use of TiAl alloys for gas turbines needs more sustainable creep performance. It’s proved that the lamellar microstructures are critical for TiAl alloys’ creep resistance, and thus the strain induced lamellar degradation usually results in the acceleration of creep deformation. The benefit of minor carbon addition on creep resistance of the lamellar TiAl alloys has been widely identified and attributed mostly to the carbide precipitation along lamellae, somewhat to the C solution strengthening, but little to microstructure stability. This study recently found that adding minor C in a cast TiAl alloy with monolithic hard lamellar orientation can significantly extend its steady creep stage at 760℃ and meanwhile sustain the lamellar structures for much longer time. The relatively lower strain concentration and pinning effect of C or carbides are believed to be the reason of less lamellar degradation and will be discussed in details.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)