Wear map for grey cast iron

The sliding wear resistance of a A30 type grey cast iron against AISI 52100 type steel was measured within a load range of 0.3–50.0 N, and a sliding speed range of 0.2–3.0 m/s using a block-on-ring wear machine. The wear rates and the surface temperatures were measured as a function of loading conditions. A wear map was constructed to summarize the measured wear rates and mechanisms that control the wear rates. Ultra-mild, mild, and severe wear regimes were identified on the map. In the ultra-mild wear regime, the wear rates were 8×10−7 and 9×10−7 mm3/m at 0.3 N for 0.2 and 0.5 m/s, respectively. The contact surfaces were covered by compacted iron oxide layers. In the mild wear regime, wear rates were in the range of 10−5 mm3/m at low loading conditions, and 10−4 mm3/m at high loading conditions. The onset of severe wear coincided with local material transfer to the steel counterface, which increased the roughness of the counterface. The wear rates in the severe wear regime were three orders of magnitude higher (e.g. 10−1 to 3.2×10−1 mm3/m) compared to those of the mild regime.