Yuji Tsukamoto1, Hiroaki Sasaguchi2 and Fusao Hayama3
1Castings Research Laboratory, Waseda University, Tokyo
In the previous paper the authors proposed that friction and wear behaviours between mild steel and various brasses could be explained by the prow formation mechanism. The present test program was carried out to clarify some effects of the mating materials on the adhesive wear characteristics of various brasses. Five different metals (i.e. mild steel, medium carbon steel, hardened carbon steel, α brass and α+β brass) were selected as pin specimens, and unlubricated low speed wear experiments were conducted on nine sliding pairs.
The wear behaviour of α brass ring specimens depended on the mating materials. Since substantial prow growth took place on the simillar pair of α brass, the ring specimen showed a higher wear rate than that of the other couples as expected from the empirical laws. The mild steel- α brass combination exhibited the transition from the running-in period to the steady state having a lower wear rate. This transition is accompanied by the prow formation process which involved the break-away near the interface between the prow and a pin specimen. It is interesting to note that the deformation twin region is formed below the wear track of α brass slid against mild steel.
The wear characteristics and prow formation processes of α+β brass were governed mainly by the plastic shearing deformation properties following continuous prow growth, especially sliding systems of α+β brass and various carbon steels showed essentially identical prow formation processes. On the simillar pair of α+β brass a prow broke away along the crack propagated into the pin specimen, and the surface was worn out to flat.
Please do not copy without permission.