Effect of structural features on erosion resistance of cast irons

Abstract

Erosion resistance of four types of cast iron of different microstructures and graphite morphologies (viz., grey cast iron, compacted graphite iron, spheroidal graphite iron and austempered ductile iron) was evaluated in three different erosive media. Results indicate that austempered ductile iron has the highest erosion resistance in all three media, followed by spheroidal graphite iron, compacted graphite iron and grey cast iron, in that order. Graphite morphology has a significant effect on the erosion resistance of these irons in quartz-water and iron oxide-oil slurry. However, the matrix microstructure determines the erosion resistance of these irons in quartz-oil slurry. The parameter HIE (which is the ratio of the Brinell hardness number to Young's modulus of the material) has been found to be a good indicator of erosive wear in quartz-oil slurry.

Optimization of the process parameters affecting the microstructures and properties of compacted graphite iron

“…However, in several studies, a fully pearlitic structure could not be obtained even at 1.7% Cu when using high-purity charge materials [5,12,13]. To produce a pearlitic matrix, therefore, it may be necessary to add higher than usual levels of alloying elements or to make multiple additions of two or three elements [2,14,15]. For example, tin is considered a strong pearlite stabilizer and in one study, a structure containing 95% pearlite was obtained with 0.13% Sn [2].…”

Mechanical, wear and heat exposure properties of compacted graphite cast iron at elevated temperatures

“…Historically, cast iron has been used in engine blocks, cylinder heads, brake drums and disks, because it possesses a good combination of mechanical strength, friction properties and thermal conductivity. Of the different forms, grey cast iron (GCI) is susceptible to thermal induced fatigue, and ductile iron experiences severe heat distortion [8,9]. The intermediate characteristics of CGI make it potentially attractive in applications where grey and ductile cast iron are not suitable.…”