Abstract
Alloys in the composition range of Cr 50–65, Si 0–10, C 4–8 %, balance Fe were subjected to differential thermal analysis, the classical quench method, microscopic examination, X-ray diffraction and electron-microprobe analysis. The liquidus temperatures and a considerable proportion of the phase constitutions have been determined for these alloys. The primary phase is (Cr,Fe)7C3 over the entire range of alloys investigated. Two pseudo-binary eutectics were identified; these eutectic reactions result in the formation of (Cr,Fe)7C3 and either α-or γ-iron–chromium solid solution, together with a eutectic reaction, which results in the formation of γ-iron–chromium solid solution and (Cr,Fe)23C6. There is a peritectic reaction between liquid alloy and (Cr,Fe)7C3 that yields (Cr,Fe)23C6, and a peritectoid reaction in which (Cr,Fe)7C3 and α-iron–chromium solid solution react to form (Cr,Fe)23C6. Those phases that contain silicon have been identified.