RUNNING-IN CHARACTERISTICS OF GRAPHITIC CAST IRON

Grey cast iron has been rubbed under dry sliding conditions so that changes in surface topography could be related to subsurface metallurgical changes. 'White layer'forms towards the end of running-in and subse-quently becomes covered with oxide.The presence of free ferrite increases wear, and phosphorus decreases wear during running-in. The use of optical microscopy and stcrcoscan techniques shows that Oplastic: deforma-tion and fracture arc important mcc:hgni~."s of wear during running-in. TE 99 通用摩擦磨损试验机