About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Characterization of Low-Cycle Fatigue Deformation Behavior at RT/200 °C of FeMnAlC Lightweight Steel for Low-Pressure Turbine Blade |
Author(s) |
Uiseok Ko, Chi-Won Kim, Sung-Jun Park, Hyun-Uk Hong |
On-Site Speaker (Planned) |
Uiseok Ko |
Abstract Scope |
Recently, FeMnAlC lightweight steels are being considered a candidate for high-strength steel materials by applying it to economic and social demands of greenhouse gas reduction and material reduction of power generation by improving energy efficiency. Considering the application environment of the low-pressure turbine blade for power generation, fatigue characteristics are essentially required. Accordingly, this study investigated the low-cycle fatigue behavior of FeMnAlC lightweight steel. During low-cycle fatigue, cyclic softening occurred at room temperature and cyclic hardening occurred at 200 °C in all the investigated strain ranges, Δεt=0.6–2.0%. In addition, the serrated flows were observed in the hysteresis loop at 200 °C, unlike at RT. To find out the influence of dynamic strain aging, various fatigue tests with different strain rates were conducted. Therefore TEM observed the interrupted fatigue specimens to make a profound understanding of how dislocation evolutions are developed and their effects on cycle hardening/softening were influenced. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Other, Other |