|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||An Experimental Assessment of the α + α' Miscibility Gap in Fe-Cr
||Alexander Dahlstrom, Frederic Danoix, Peter Hedstrom, Joakim Odqvist, Helena Zapolsky
|On-Site Speaker (Planned)
Phase separation in the Fe-Cr miscibility gap has been studied experimentally. A tendency to de-mix enable the formation of an α (Fe-rich) + α’ (Cr-rich) modulated nanostructure in Fe-Cr alloys. This phase separation triggers a change in mechanical properties known as the “475°C embrittlement”, causing a restriction in service life-time. The upper limit of the miscibility gap during the early stages of phase separation has been investigated and decided within ± 2°C. Vickers micro hardness has shown good potential effectively indicating the presence of phase separation. Utilizing atom probe tomography as a means when traditional metallographic characterization is challenged allows for analyzing the nanostructure on the atomic scale. To deepen the understanding of the limit of phase separation, the transition in the upper limit of the miscibility gap is further discussed based on atom probe analysis and the theory of spinodal decomposition by J.W. Cahn.
||Planned: Supplemental Proceedings volume