|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||N-17: Effects of Additional Elements on the Phase Stability and Precipitation Behavior of C14 Laves Phase in High Cr Ferritic Alloys
||Ko Kato, Yaw Wang Chai, Yoshisato Kimura
|On-Site Speaker (Planned)
The effects of additional elements on phase stability and precipitation behavior of C14 Laves phase (Fe,Cr)2(Nb,Mo) in high Cr ferritic alloys with Nb and Mo were investigated. We confirmed that the growth mechanism of C14 Laves phase is the ledge mechanism on its basal plane using a transmission electron microscopy. The lattice misfit between ferrite and Laves phase decreases as the Mo content increases, and Laves phase precipitates finely and uniformly in the ferrite matrix. According to the Si addition on a Fe-Cr-Nb-Mo quaternary alloy, the amount of Mo partitioned in Laves phase becomes larger than that of Nb. It indicates the strong attractive interaction between Si and Mo, which improves the phase stability of C14 Laves phase. Therefore, the Mo content in the ferrite matrix is reduced by the Si addition, and thereby the phase equilibrium changes so that the volume fraction of Laves phase increases.
||Planned: Supplemental Proceedings volume