Surface Durability of Steel Rollers : In Relation to Hardness

概要

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In order to clarify the effects of hardness on the surface durability and surface failure, fatigue tests on various heat-treated steel rollers were carried out under sliding rolling contact condition. The surface failure modes could be estimated by the values of the maximum amplitudes A_<max> of the ratios of normal stress on the surface in circumferential direction of roller and of orthogonal shear stress under the surface to Vickers hardness and the peak amplitude A_<peak b> of the ratio of orthogonal shear stress to Vickers hardness which occurs at case-core boundary. The relation between the surface durability together with the surface failure mechanism and the hardness distribution could be clarified by calculating the amplitudes A_<max> and A_<peak b> and by Vickers hardness at the depth of these amplitudes. From the standpoint of design, the surface durability of a machine element can be evaluated from the equation A_<max>=0.051 or A_<peak b>=0.035 when the hardness and residual stress distributions of the machine element are known.
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