Abstract
Experimental centrifugally cast high speed steels (HSSs) with a modified solidification microstructure were produced, with the aim of improving impact properties and thermal fatigue resistance to extend the application of these materials to the production of roughing and intermediate finishing hot rolls. On the basis of a Thermo-Calc simulation, the chemical composition was changed to reduce the amount and continuity of the eutectic carbide network. All study materials with such a modified microstructure exhibited a significant increase in the above-mentioned properties with respect to a standard HSS grade used in first finishing stands. This result was obtained by increasing the contents of alloying elements that form proeutectic carbides, and of carbon.
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