Abstract
Working walls of crystallizers of continuous casting machines (CCM) are made of copper with various alloying additives. The use of copper is due to its high thermal conductivity, which provides rapid heat removal from the crystallizing metal, and alloying additives reduce the rapid wear of copper in the process of crystallizer operation. In this paper copper alloyed with iron of different concentrations is investigated. Experimental dependences of thermoelectromotive force, electrical resistivity and hardness (HB) on temperature at different magnitudes of plastic deformation are obtained. It is shown that at the same magnitude of deformation with increasing iron concentration the hardness of the alloy and its recrystallization temperature increases. As an indicator of structural changes occurring in alloys during thermal treatment methods was analyzed electrical resistance, which is known to be a structurally sensitive property So the analysis showed that in copper plastic deformed up to 50% and additionally alloyed with iron the process of restoration of electrical resistivity proceeds more slowly and at higher temperatures, compared to pure copper. At the same time, complete recovery of residual electrical resistivity is observed in the range of 350°C. In this case, the main processes of annealing defects are recrystallization and return. In the final part of the work recommendations for the practical use of iron-copper alloys are formulated.
Keywords:
iron-copper alloy, electrical copper, four-electrode method, thermoelectromotive force, electrical resistance, hardness, recrystallization temperature.