Abstract
The solid solubility ranges of the phases and their equilibrium relationships in the Ti-Fe-C system were studied by microscopic examinations and X-ray analysis. The results of investigation indicate that the following solid phases exist in this ternary system : titanium-rich solid solutions α or β, graphite, δ phase known as titanium carbide phase, TiFe phase, TiFe2 phase and iron-rich solid solution α or γ, but no ternary compound is detected. The δ phase region is given as from 13 to 20 weight%C and the maximum solid solubility of Fe in this phase is about 15 weight%. A change of the C concentration in the δ solid solution has a greater effect upon the lattice parameter of the δ phase than that of Fe concentration. The solid solubility of ternary TiFe phase is given as from 52 to 54 weight% of Fe and the maximum solubility of C is considered to be less than 0.1 weight%Fe. The ternary TiFe2 phase has a wide range of solubility of iron which extends from 69 weight pct to 77 weight pct of iron, and the maximum solid solubility of carbon in the TiFe2 phase is considered to be less than 0.2 weight pct of carbon. The δ solid solution is in equilibrium with α or β titanium, TiFe phase, TiFe2 phase, α or γ iron and graphite, and there exist two quasi-binary eutectic reactions of liquid\ ightleftarrowsδ+TiFe2 and liquid\ ightleftarrowsδ+(Fe)α.
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