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Surface Durability of Steel Rollers : In The Cases of Case Hardened and of Nitrided Rollers

1978; Japan Society Mechanical Engineers; Volume: 21; Issue: 154 Linguagem: Inglês

10.1299/jsme1958.21.761

1881-1426

Komei FUJITA, Akira Yoshida,

Surface Treatment and Residual Stress

In order to clarify the surface failure and the surface durability of surface hardened steel rollers, case-hardened and nitrided steel rollers having 60mm outside diameter were examined by a rolling contact fatigue testing machine. With case-hardened rollers, there is optimum case depth for surface durability. The surface durability of nitrided rollers spalling cracks initiate in case-hardened layer and with nitrided rollers at case-core boundary. At the locations where spalling cracks initiate, the amplitude of the ratio of share stress to Vickers hardness becomes maximum. The surface durability and rolling contact fatigue life of case-hardened and nitrided rollers can be calculated by using the equations for the relation between the relation between the maximum amplitude of this ratio and the number of cycles to surface failure.