Phase Equilibria in the Cr–Fe–Si–C System in the Composition Range Representative of High-Carbon Ferrochromium Alloys Produced in South Africa

Authors: Wethmar, J. C. M.; Howat, D. D.; Jochens, P. R.

Source: Metal Science, Volume 9, Number 1, 1975 , pp. 291-296(6)

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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 ?-or ?-iron–chromium solid solution, together with a eutectic reaction, which results in the formation of ?-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 ?-iron–chromium solid solution react to form (Cr,Fe)₂₃C₆. Those phases that contain silicon have been identified.

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/030634575790444667

Publication date: 1975-01-01

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