High speed sliding wear behavior of recycled WCP-reinforced ferrous matrix composites fabricated by centrifugal cast

A discarded/scrap WCP/Fe–C composites roller rings was re-melted in a 50 kg medium frequency induction furnace, and a recycled composites was manufactured by centrifugal casting method using the composites re-melts. Dry sliding wear properties of the recycled composites have been investigated using a pin-on-disc wear tester at room temperature under loads of 50, 100 and 150 N and sliding speeds of 60 and 80 m/s. Results show that the microstructure of the recycled composites consists of un-dissolved WCP and bainite matrix. Wear rate of the recycled composites increases with the increase of load and sliding speed. And the friction coefficient of the recycled composites decreases with the increase of load and sliding speeds. The wear rate of the recycled composites almost is same as the primary composites, and the friction coefficient is obviously higher than that of the primary composites under same test conditions. Finally, the mechanisms of the dry sliding wear for the recycled composites are discussed.

► In this study a recycled ferrous matrix composite reinforced with un-dissolved WCP was fabricated by centrifugal casting.
► Hardness of the recycled ferrous matrix composite attained to HRA80-85.
► Wear behavior of the recycled composite under high speed dry sliding approached to that of the primary composites.
► Two regimes of wear are evident; (1) mild wear characterized by oxide generation and low wear rate and (2) severe wear characterized by metallic contact at the rubbing surfaces and high wear rate under high sliding speeds and loads.