About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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High Temperature Creep Properties of Advanced Structural Materials
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Presentation Title |
F-2: Effects of Controlling Ti and Al on Microstructure and Mechanical Properties of Fe-Cr-Co-Al-Ti Ferritic Alloys |
Author(s) |
Jeongeun Kim, Kanghyun Park, Byungchan Cho, Karam Lim, Chanho lee, Jiwoon Lee, Gian Song |
On-Site Speaker (Planned) |
Jeongeun Kim |
Abstract Scope |
Fe-Cr-Ni-Al-Ti ferritic alloys strengthened by hierarchically-structured coherent precipitates (B2-NiAl/L21-Ni2TiAl) exhibit excellent creep properties due to optimized coherent lattice strain between the Fe matrix and precipitates. However, These alloys consist of nano-scale B2-NiAl precipitates forming during cooling, which is known to deteriorate the room temperature ductility.
In this study, we designed new Fe-Cr-Co-Al-Ti ferritic alloys to avoid the formation of the B2-NiAl cooling precipitate and enhance the mechanical properties at room and high temperatures. Cobalt was employed instead of Nickel to form precipitates coherent with the BCC Fe matrix, such as B2-CoTi, CoAl, and L21-Co2TiAl phases. Furthermore, the main elements to form the coherent precipitates were systematically adjusted to achieve the different volume fraction of the precipitates and optimize the lattice strain between the precipitate and matrix. We will present the microstructure and mechanical properties of newly-designed Fe-Cr-Co-Al-Ti ferritic alloys, characterized using Scanning-Electron-Microscope, Transmission-Electron-Microscope, X-ray Diffractometer, Universal Testing Machine. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, Iron and Steel |