Determination of Liquidus and Solidus Surfaces at Iron-rich Region of Fe-Cr-Ni System

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Abstract
The liquidus and solidus surfaces of iron-rich corner of Fe-Cr-Ni system, which are closely related to the solidification behavior of commercial stainless steels, were determined. The tie-lines were measured with the concentration profile of planar liquid-solid interface obtained by stationary melting method, and the liquidus temperatures were measured by differential thermal analysis. These results, combined with the morphological analysis of unidirectionally solidified specimens, were used to clearly determine the α (ferrite) and the γ (austenite) regions of iron-rich corner and the liquidus and solidus surfaces including tie-lines. The results have shown good agreements with the work reported by SCHÜRMANN et al., except for the peritectic-eutectic line, which have found to shift slightly toward the Fe-Cr side between 10 and 15 wt%Cr. The peritectic-eutectic transition point was found to be at the composition about 15 wt%Cr-10 wt%Ni.