S. V. Burov, Yu. V. Khudorozhkova

DISTRIBUTIONAL AND MORPHOLOGICAL CHANGES IN EXCESS CEMENTITE DURING DEFORMATION OF HYPEREUTECTOID STEELS

Obtaining of layered excess cementite distribution in hypereutectoid steel by deformation in the intercritical temperature range is considered. The initial state prior to deformation is cast steel and heat treated cast steel. It has been revealed that in the cast state excess cementite can be represented in the form of plates in a volume of austenite grains, in the form of network along austenite grain boundaries, in the form of liquation-induced aggregates (tangles) in the interaxial intervals of austenite dendrites. Typically a cast structure contains all of these morphologies. Sometimes excess cementite can be represented as primary cementite in nonequilibrium ledeburite. It has been found that a reliable method to obtain the layered structure without the presence of coarse particles of cementite is deformation in the intercritical temperature range of hypereutectoid carbon steel with an initial Widmanstätten morphology of excess carbide phase.

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