MECHANISMS OF SURFACE DETERIORATION OF ROLL FOR HOT STRIP ROLLING

Investigation of mechanisms of the surface deterioration of the roll for the hot strip rolling is very important for the development of the new roll material. Then, several experiments are conducted based upon results obtained by earlier investigations, and considerations concerning it are given. The experiments are a rolling/sliding friction test at high temperature and a rolling contact fatigue test using specimens previously incurring thermal fatigue. The surface and its cross section of tested disks are examined carefully by a scanning electron microscope and an optical microscope. Regarding the wear, abrasion of the matrix at high temperature is probably one of the main mechanisms. And regarding the surface roughening, the rolling contact fatigue of the material that has previously incurred perpendicular crack is probably one of the main mechanisms. However, these models of the surface deterioration mechanisms should be refined in future, as it is very important problems for a rolling tribology.