Effect of process time on the tribological properties of boronized GGG-80 ductile cast iron

摘要

Purpose - Wear behavior of boronized GGG-80 ductile cast iron were studied against WC-Co ball for determining the effect of boronizing time and temperature. Design/methodology/approach - Ball on disk arrangement was used for determination of tribological properties of boronized ductile cast iron depending on process time and temperature. Boronizing treatment was performed on GGG-80 ductile cast iron using salt bath immersion boronizing technique at 850 and 950℃ for2-8 h. Friction and wear tests were carried out at dry test conditions under 2.5 and 10 N loads with 2.5 m/min sliding speed. Findings - The result showed that the friction coefficient values ranged from 0.12 to 0.2 depending on the process parameters. The higher the treatment temperature and the longer the treatment time, the thicker the boride layer, the more the FeB phase and the higher the specific wear rate became. The specific wear rate of boronized ductile cast irons depending on process time, temperature and applied load against WC-Co ball ranged from 1.25 × 10{sup}(-5) to 42.45 × 10{sup}(-5) mm{sup}3/Nm. Values of coefficient of boronized ductile cast irons increases with increase in load in the wear test and increase in boronizing time and temperature. Research limitations/implications - The study deals with only ductile cast irons and their tribological properties. Practical implications - The results are very useful for practical applications and academic study. There is a little number of studies on the boronizing of cast irons. This study will be helpful for the researcher studied on boronizing of cast irons. Originality/value - The properties of the tribological properties of ductile cast irons have not explained detail in the earlier study. There are new results in this study on the tribological properties of boronized ductile cast irons. Because of this, the paper is original.