Metall. Res. Technol.
Volume 114, Number 4, 2017
|Number of page(s)||8|
|Published online||03 July 2017|
Solidification interface transformation and solute redistribution of FeCrAl stainless steel
Institute of Engineering Technology, University of Science and Technology Beijing,
100083, PR China
2 Technical Center, Hebei Xinji Aosen Steel Co. Ltd., Xinji 052360, PR China
3 State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, PR China
* e-mail: email@example.com
Received in final form: 22 February 2017
Accepted: 3 March 2017
The solid–liquid interface structures and the Al segregation in the solidifying front were investigated by directional solidification and electron probe microanalysis. The results show that the interface structure would vary greatly with solidification velocity, the morphology of which changed from planar at 1 µm/s, dendrite at 25 µm/s, cellular–dendrite at 50 µm/s, to hexagon cell at 100 and 150 µm/s and finally high-velocity cell at 200 µm/s. The stability of the planar interface was mainly influenced by Al segregation. The narrow solidification temperature range benefited the transformation of dendrite to cell-dendrite. Regarding Fe, Cr as solvents and Al as solute, the secondary dendrite arm spacing when solidification velocity is 25 µm/s could be predicted by the formula which was widely adopted in binary alloy system, and the predicted values fit well with the experimental results. The Al partition coefficient was found to be 0.96, and it indicated that there existed slight Al segregation when solidification velocity is 1 µm/s, which was the main stabilizing factor of the planar interface. Al segregation is not obvious at velocities above 25 µm/s and the interface transformed to various structures when solidification velocities were higher than 25 µm/s.
Key words: FeCrAl stainless steel / directional solidification / interface structure / solute redistribution
© EDP Sciences, 2017
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