高周波焼入れ粉末焼結ローラの面圧強さに関する研究 : 硬化層深さおよび相対曲率半径の影響

概要

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In order to obtain fundamental data on the surface durability and surface failure mode of induction-hardened sintered powder metal rollers, rollers made of pre-alloyed powder with diameters 30 and 60 mm were fatigue-tested with case-hardened melted steel rollers under a sliding-rolling contact condition. The experimental results were discussed by the amplitude of the ratio of shear stress to Vickers hardness. The surface failure mode in this experiment was spalling due to subsurface cracking. The depth of the spalling crack agreed well with the depth of the peak amplitude of the ratio of orthogonal shear stress to Vickers hardness. The surface durability tended to increase as the relative radius of curvature decreased. There was an optimum hardened depth for the surface durability. The pores played an important role in the occurrence of cracks.
1992-05-25