|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials in Clean Power
||Microstructural Stability of High Cr Containing FeCrAl Alloys with Minor Alloying Additions
||Yukinori Yamamoto, Bruce A. Pint, Benjamin Shassere, Sudarsanam Suresh Babu
|On-Site Speaker (Planned)
The effect of minor alloying additions on microstructural stability of Fe-30Cr-3Al-0.2Si-2Nb alloy was investigated. The additions of W, Mo, and Ti, substituting for Nb, were selected with guidance from thermodynamic calculations to control Fe2Nb Laves phase precipitation kinetics in the BCC-Fe matrix. These alloying additions lowered the solvus temperature to expand the process temperature window without decreasing the volume fraction of second-phase particles for precipitate strengthening at 700°C. However, the alloying additions also resulted in coarsening the second-phase particles during aging at 700°C. Optimization is required to balance the beneficial effects on the process window with the reduced particle size stability. The addition of Y stabilized the grain structure at elevated temperatures. This effect would aid in controlling grain size during hot-work processes, together with stabilizing the microstructure at the heat affected zone of weldments. Research sponsored by the Crosscutting Research Program, Office of Fossil Energy, U.S. Department of Energy.
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