Researches on Brass Containing Pb (Part 8)

The wear loss of 70:30 brass sliding on steel shaft(hardened to HRC 6062)has been measured. Pure α-brass does not scarcely wear at up to the speed of 150 cm/s, and while the hardened steel shaft wears by lapping with the powder of Fe (Fe2 O3) which has been slightly seized from the steel surface in the first step. The wear properties of α-brasses containing Pb are varied by Pb content. The most brittle material among these Pb-brasses wears in such a manner as 60:40 brass does, and the wear loss suddenly increases more than that of brass at a certain rubbing speed. The fact that the wear of β-phase alloy decreases with the rising of rubbing speed, coincides with that the β-strUcture becomes tough under the high temperature.