Tribological behavior between commercially pure titanium and high speed steel at high temperature

摘要

It is said that in hot-rolling titanium surface defects are apt to occur by seizures between rolls and products. Authors have examined the effects of temperatures and lubricants on the tribological behavior of titanium strip surfaces contact with rolls using a hot rolling and sliding wear tester with commercially pure ritanium disks and a high speed steel ones. Consequently in cases of water spray without lubricant oil, fine cracks due to hard layers by oxidation decrease with lower temperature, but the coefficient of friction increases because oxide scales become thin and then metals are easily in contact. The coefficient of friction at 650℃ doubles in comparison with that of 850℃ and foil-like overlaps occur. Addition of lubricant oil reduces the coefficient of friction at 650℃ by half and smooth surfaces are obtained. The smooth surface is thought to be due to the lubrication effects of oxide-scales as well as the lubricant.