A study of carbide removal mechanisms during quartz abrasion I: In situ scratch test studies

摘要: Abstract In this paper scratch test simulations of carbide removal mechanisms in high chromium white cast irons during low stress abrasion by quartz abrasive are described. Scratch testing was performed inside the scanning electron microscope using individual grains rounded as tools. Linear multipass scratches same path were made on preworn and deeply etched metallographic surfaces hypereutectic iron. The results sequential tests showed that a gradual enlargement pre-existing cavities primary carbides occurs fracture near unsupported edges cavities. Short duration preferential matrix material present some resulted small pits these carbides. large produced apparently progressive series events rather than gross single event. Gross not even though loads used considerably excess those experienced abrasion. rounding shown to be due microfracture sharp left matrix. Quartz no grooves at loads, between protected protruding fragments debris can cut through another carbide. It is proposed which leading caused debris.