Abstract
The purpose of this report is to elucidate the influences of sintering method and type of steel powder on surface durability of induction-hardened sintered powder metal rollers. Six kinds of induction-hardened sintered powder metal rollers with a diameter of 60 mm, which were produced by hot isostatic pressing process (HIP), and by single-pressing and single-sintering process (1P1S), using three types of steel powders-pure steel powder, prealloyed steel powder and partially prealloyed steel power, were fatigue-tested under a sliding-rolling contact condition. The failure mode of all rollers was spalling due to subsurface cracks. The surface durability of HIPed rollers was higher than that of 1P1Sed rollers. In the case of HIPed rolles, the surface durability of the roller made from the prealloyed steel powder was the highest. In the case of 1P1Sed rollers, the surface durability of the roller made from the partially prealloyed steel powder was the highest. The pores played an important role in the surface durability of the sintered rollers.
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