Phase Diagrams
Tungsten-Iron-Carbon (W-Fe-C) Phase Diagram
A vertical section (isopleth) of the tungsten-iron-carbon (W-Fe-C) phase diagram (see Figure 1) is often used to show what happens if cobalt in the tungsten-cobalt-carbon (W-Co-C) ternary system (the basis for cobalt-bonded WC tools) is completely substituted by iron.
Iron moves the favorable FCC + WC region towards higher carbon contents, slightly decreases its width, and lowers the solid-liquid temperatures.
Figure 1. Vertical section (isopleth) of the tungsten-iron-carbon (W-Fe-C) ternary system, calculated with Thermo-Calc coupled with SSOL4 thermodynamic database. The iron content is kept constant at 10 wt. %.
A stoichiometric mixture of WC + 10 wt. % Fe corresponds to approximately 5.52 wt. C; the value which is on the border between the desirable FCC + WC field and the undesirable FCC + M6C + WC field.
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• Vertical section (isopleth) of tungsten-iron-carbon ternary system
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