Experimental determination of the dependence of microhardness of iron-aluminum alloys on preheating of initial charge materials intended for alumothermitic remelting
Abstract:
In mechanical engineering, metallurgy and electrical engineering, various phases of intermetallic iron-aluminum alloys, due to their high resistance to corrosion and abrasive wear, are used as coatings for structural elements operating under conditions of complex loading and high temperatures. The relatively low cost and prevalence of the components of such alloys determine the economic feasibility of their use. Industrial production of such alloys and coatings based on them, as a rule, is carried out in the course of a significant number of technological operations, which complicates the expansion of the product range and determines the paths to find alternative methods. The use of aluminothermic remelting of charge materials consisting of a mixture of scale fractions and aluminum alloys makes it possible to reduce the process of obtaining intermetallic alloys based on Fe-Al to practically one stage. Due to the lack of practical information on such a process, predicting the properties of the final alloys currently seems difficult. A series of preliminary studies made it possible to obtain alloys with an Al content exceeding 50%. The paper presents the results of experiments to determine the effect of additional heat introduced into the source materials on a number of characteristics and microhardness values of iron-aluminum alloys obtained by exothermic remelting of thermite batches.
Keywords:thermite charge, thermophysical effect, iron aluminides, material strength, hardness of intermetallic alloy.
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