Abstract
From observations of the metalic structure at the seized portion in two roller tests and the calculation of the stress resulting from the combination of the Hertzian stress field, the frictional force field and the thermal stress field on the contacting rollers, it was found that the seized portion on the rollers adhered to the surface of the lower roller rotating at high speed and its hardness was considerably high, and the portion could be easily separated from the surface of the lower roller. The mechanism of adhesion can be considered as follows : as the shearing stress (Hertzian stress + frictional force + thermal stress) acting on the upper roller is larger than that on the lower roller, the portion of the upper roller, at which the distribution of the hardness below the surface of the roller is minimum, is sheared due to the shearing stress, and adheres to the surface of the lower roller.
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