Abstract
Abstract New equipment for wear testing at elevated temperatures has been constructed. Test samples in the shape of blocks or rollers are pressed against a rotating disc (500 mm in diameter) which can be heated to 900°C. The periphery velocity is continuously variable between 0 and 50 m s −1 . When testing rollers, the angle between the disc and the roller axis can be varied from 0 to 5° to obtain a desired interfacial sliding at the contact surface. It is possible to load and unload the test specimen periodically and to record the frictional force. The ability of the test to reproduce the wear behaviour of guide rollers used in hot rod rolling mills was evaluated for two materials, tool steel (AISI D2) and Ferrodur, a sintered steel containing titanium carbides. Stationary guides of one grey cast iron grade were also included in this comparison. The specimens have been tested against a disc of structural steel (AISI 1045). For a particular set of test parameters it was found that the surface structure of the laboratory specimens very much conforms with that of the service case aimed at. Typical wear characteristics are microabrasion by oxide particles, thermomechanical surface cracking and adhesion of the hot material to the specimen surface. Parameters like contact pressure, rolling and sliding distance between the guide and rod material are extremely difficult to control in a hot rod rolling mill. Therefore this test equipment is expected to be of great value for the selection and development of new materials in mill guides and for similar applications in sliding or rolling contacts at elevated temperatures.
Published Version
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