The Effects of Si and Al Alloying on α/γ Phase Equilibria in Fe-Cr-Ni-Mn Based Ternary and Quaternary Systems

Journal of Phase Equilibria and Diffusion - 2014
I. Shuro1,2, S. Kobayashi1, T. Nakamura1, K. Tsuzaki3,1
1National Institute for Materials Science, Tsukuba, Japan
2Electron Microscope Unit, University of Cape Town, Cape Town, South Africa
3Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan

Tóm tắt

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 (Cr eq 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 (Cr eq Al ) ranged between 0.6 and 4.8 decreasing with increase in Ni and Mn content. When compared to Cr eq Al , the Cr eq Si do not show a strong dependence on Ni and Mn content. Thermodynamic calculation using Thermo-Calc software agrees with the experimental results qualitatively.

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Journal of Phase Equilibria and Diffusion

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