Technological bases for increasing the durability of aviation parts by chemical heat treatment

Abstract

Abstract The paper presents studies of the structure and properties of low-carbon alloy steels after carburizing. A comparison of four types of carburizing (batch carburization, conveyor carburization, fluidized bed carburization and ionic carburization) is made. The influence of technological modes of chemical-thermal treatment on the phase composition and amount of carbide phase in a carburized layer is considered. It is shown that the type of carburizing affects the operational properties of parts of aircraft mechanisms. The best results were shown by the details after ion vacuum carburizing. The increase in wear resistance and contact fatigue is associated with the formation of a high-quality surface layer having a higher hardness and a higher proportion of the carbide phase. Such properties cannot be obtained after conventional types of carburizing in a shaft or conveyor furnace. In this case, ionic carburizing and carburizing in a fluidized bed make it possible to halve the technological regime of carburizing in comparison with two other methods.