イオン窒化粉末焼結ローラの面圧強さに及ぼす圧粉密度の影響

概要

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In order to evaluate the surface durability of ion-nitrided sintered powder metal rollers, the relationship between the surface durability and the green density of the sintered rollers was investigated under a sliding-rolling contact condition. The failure mode of the rollers was spalling due to subsurface cracks. The surface durability of the roller became higher as the green density increased. The pore size and the pore cluster factor represented by the fractal demension became smaller as the green density incleased. Therefore, it could be said that the surface durability of the sintered roller depended on the pore distribution. The spalling failure depth agreed almost with the peak depth of the amplitude A (τ_<yz>/Hv) of the ratio of orthogonal shear stress to Vickers hardness. The surface durability was evaluated using the amplitude A (τ_<yz>) of the shear stress and the hardness Hv at the peak amplitude of A (τ_<yz>/Hv). It could be understood that the pore distribution played an important role when the sintered material was designed in terms of the surfface durability.
一般社団法人日本機械学会の論文
1999-11-25