Thermodynamic and kinetic analysis of the melt spinning process of Fe-6.5 wt.% Si alloy

Senlin Cui, Iowa State University
Gaoyuan Ouyang, Iowa State University
Tao Ma, Ames Laboratory
Chad R. Macziewski, Iowa State University
Valery I. Levitas, Iowa State University and Ames Laboratory
Lin Zhou, Ames Laboratory
Matthew J. Kramer, Ames Laboratory
Jun Cui, Iowa State University and Ames Laboratory

This is a manuscript of an article published as Cui, Senlin, Gaoyuan Ouyang, Tao Ma, Chad R. Macziewski, Valery I. Levitas, Lin Zhou, Matthew J. Kramer, and Jun Cui. "Thermodynamic and kinetic analysis of the melt spinning process of Fe-6.5 wt.% Si alloy." Journal of Alloys and Compounds (2018). DOI: 10.1016/j.jallcom.2018.08.293. Posted with permission.

Abstract

The microstructural evolution of Fe-6.5 wt.% Si alloy during rapid solidification was studied over a quenching rate of 4 × 104 K/s to 8 × 105 K/s. The solidification and solid-state diffusional transformation processes during rapid cooling were analyzed via thermodynamic and kinetic calculations. The Allen-Cahn theory was adapted to model the experimentally measured bcc_B2 antiphase domain sizes under different cooling rates. The model was calibrated based on the experimentally determined bcc_B2 antiphase domain sizes for different wheel speeds and the resulting cooling rates. Good correspondence of the theoretical and experimental data was obtained over the entire experimental range of cooling rates. Along with the asymptotic domain size value at the infinite cooling rates, the developed model represents a reliable extrapolation for the cooling rate > 106 K/s and allows one to optimize the quenching process.