| Abstrakt: |
One method for the production of material of a new class is the use of the “ferrite ? austenite + carbide” transformation. The transformation occurs under specific temperature-concentration parameters of carburization of low-carbon ferritic “iron-carbide-forming element” alloys. Ferrite decomposes with formation of austenite-carbide colonies similar to eutectoid ones. The colonies are preferentially oriented in the direction of carbon flow, i.e., normal to the carburized surface. Fe-Ti and Fe-Ti-AE alloys, where AE is the alloying element, are of special interest in this connection. Titanium carbide is extremely hard and, when used as an agent reinforcing the surface layer, increases the hardness and wear resistance of the alloy. In addition, TiC dissolves impurities poorly, and therefore in the alloying of Fe-Ti alloys by elements improving their thermal stability or corrosion resistance, its formation will not deplete the matrix. However, the addition of a third component to the Fe-Ti alloy may cause degeneration of the structures of the colonies. The present work is devoted to the effect of different concentrations of chromium on the structure of carburized Fe-Ti alloys. |
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