Regularities of Explusion in the «Fe-Cu-C-Metal» System and Formation of the Compositional Structure of the «Copper Matrix - Iron Carbon Inclusion»

Processy litʹâ, 2019, Tom 138, №6, p.59-66

Abstract

Received 17.09.2019

UDK 621.74.074:669.35’6

The work is devoted to the study of the laws of obtaining composite materials on a copper basis, with a reinforcing component in the form of endogenous globular glandular inclusions, which are formed as a result of delamination during contact interaction of the melt with the components of «Fe−Сu−C» systems and are distributed in the volume of casting due to casting iron in the liquid phase of the copper melt. It is shown that the main factors influencing the amount of stratified ironcontaining liquid distributed in a copper melt are the ratio of carbon of steel plates and the thermotime parameters of isothermal holding. It is established that three zones are clearly distinguished on the distribution of the number of ferruginous inclusions on the microstructure of the samples: zone with high content of ferruginous inclusions − 0 to 200 microns; zone of «permanent» number of inclusions − 200−400 microns; a small number of inclusions (up to 10 %), the vast majority of which are concentrated near a high carbon steel plate. Changing the isothermal parameters of the isothermal holding does not affect the size of the distribution zones. The study of the influence on the system of alloying elements which are a part of industrial copper alloys of type БрАЖ and БРОФ is forecasted as promising.