Abstract
The phase equilibria of the ternary system C-Fe-W are reviewed. The information on the liquidus is sufficient to permit a description to be written covering the whole range of composition; in parts it is, however, hypothetical. Eight ternary invariant reactions are proposed of which five are reasonably well established. A single ternary phase, the Fe3W3C phase, comes into equilibrium with liquid and occupies a central position with respect to the other products of primary crystallization. Two other ternary phases, Fe6W6C and FeW3C, are products of solid-state reactions and do not come into equilibrium with liquid. The solid state is not well documented but isothermal sections may be proposed for three temperatures, 1250, 1000, and 700°C.
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