Abstract
The mechanical behavior of an iron carbide base material processed by an ingot route was compared with that of the same composition material processed by a powder route. Thermo-mechanical processing routes have been developed to refine the coarse as-cast ingot microstructure. Structural refinement is a result of creation of strain-free regions by carbon dissolution from high strain energy subgrain boundaries and slip bands. The ingot-processed iron carbide material exhibits superplastic behavior and deforms by the same grain boundary sliding mechanism as for the powder-processed material. It is proposed that thermo-mechanical processing of ingot-cast eutectic-composition ceramics to achieve a superplastic structure is feasible.
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