Phase equilibria between the ferrite phase (α) and the austenite phase (γ) were investigated in the iron-rich corner of the Fe-Cr-Mn-Ni-Si/Al systems at 1000 °C using a diffusion multiple approach and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) techniques. Cr equivalents of Si and Al are established as a function of Ni and Mn content in contrast to fixed values reported in other studies. The Cr equivalents of Si (Creq Si) are in the range between −0.5 and 1.3 being positive at 0 wt.% Mn and with values slightly below zero at 5-15 wt.% Mn. The Cr equivalents of Al (Creq Al) ranged between 0.6 and 4.8 decreasing with increase in Ni and Mn content. When compared to Creq Al, the Creq Si do not show a strong dependence on Ni and Mn content. Thermodynamic calculation using Thermo-Calc software agrees with the experimental results qualitatively.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Metals and Alloys
- Materials Chemistry