Wear behaviors and mechanism of gray cast iron under dry sliding condition

Steel-cast iron dry sliding pairs are used on pin-on-disk configuration to study the wear behaviors of gray cast iron,corresponding wear laws are found and the wear mechanisms of gray cast iron under various service conditions are explored using XRD、SEM and EDS means.The results show that with the increase of applied load,the wear rate increases slowly first,then sharply,at last the increase rates become slow under those ambient temperatures tested,however,the average friction coefficient decreases greatly at first,then tends to a definite value.At room temperature,adhesive wear and abrasive wear mechanisms are dominant.While at the surrounding temperature of 200 ℃,wear mechanism is mainly adhesive wear and mild oxidation wear,however,there will be appearing massive spalling.At the surrounding temperature of 400 ℃,the dominant wear mechanism is mild oxidative-wear and abrasive wear when the applied load is small;as the applied load increasing,the wear mechanism turns into severe oxidation-wear and abrasive wear;massive spalling and plastic extrusion will be appeared after the applied load large enough.