2019 Volume 60 Issue 2 Pages 369-372
The microstructure of borated stainless steels subjected to high temperature annealing process near solidus was confirmed using scanning electron microscopy. The spheroidization and coarsening of (Fe,Cr)2B occurred significantly during annealing at 1200°C. The coarsening rate was much faster than that predicted by existing models due to the anisotropy of the precipitate, i.e., its non-spherical shape. We simulated the coarsening behavior in a multi-component diffusional simulation including the anisotropic effect with respect to annealing time. The model illustrated the coarsening behavior of (Fe,Cr)2B well in borated stainless steels, and the interfacial energy between the precipitate and the austenite matrix was estimated to be 1.8 J·m−2.