Abstract
study has been made of two pure Fe-Ti-C alloys rapidly quenched by splat cooling. The phases produced were austenite, ferrite, martensite, cementite, titanium carbide, and ε-phase. The martensite was found only in the thinnest, and hence most rapidly cooled, areas and unlike the austenite and ferrite matrix phases was not associated with any precipitated carbide. The ε-phase has a hcp crystal structure, and is similar to a metastable phase which has been reported in splat-cooled Fe-Si-C alloys. Aging of the splat-cooled material shows that the austenite decomposes in the temperature range 200–400°C, while at 700°C titanium carbide precipitates in the usual orientation relationship for fcc carbides in ferrite. The titanium carbide appears to coarsen very slowly at 700 and 800°C, although evidence is presented to show that this effect is a result of the manner in which the carbide is observed.
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