Optimization of chemical composition of Bimetallic Casting

Processy litʹâ, 2019, Tom 134, №2, p.49-54

Abstract

Received 27.12.2018

UDK 669:539.4(075.8)

Based on the analysis of the formation of the compound of the steel base and the cast-iron working layer of bimetallic castings, it has been established that a high-quality compound, when liquid iron is poured on solid steel base located in the mold, occurs when cast iron temperature is less than the temperature of steel solidification. Taking into account that the cast iron pouring and steel solidus temperatures are depended from their chemical composition, quantitative regularities of the chemical composition influence on these characteristics are established. Carbon equivalent was taken as integral parameter of the steel and cast iron chemical composition. Quantitative regularities are established of influence of the carbon equivalent on the temperatures of solidus steel and liquidus cast iron, as well as pouring of cast iron. The conditions are given of obtaining a qualitative diffusion compound of a cast-iron working layer and a steel base and an example of determining the optimal chemical compositions of a steel base and a cast-iron working layer in the manufacture of bimetallic hammer.It is shown that strength of the connection between the steel base and the cast iron working layer increases in 1.8−2.4 times for optimizing the chemical compositions of bimetallic castings, in comparison with the bimetallic castings with not optimized chemical composition.