Title: ULTRA HIGH CYCLE FATIGUE PROPERTIES OF SINTERED STEELS
Abstract: Low alloy PM steels Fe-1.5%Mo-0.7%C were used as a model material for studying high cycle fatigue of sintered steels. Ultrasonic fatigue testing was done in the push-pull mode at 20 kHz up to N>10 8 . It showed that the fatigue endurance limit strongly depends on the total porosity but also on the sintering temperature. For predicting the fatigue limit, the load bearing cross section Ac was found to be well suited which microstructural parameter can be measured in low-deformation fracture surfaces. In the matrix, homogeneous Mo distribution gives better results than heterogeneous one and heat treatment improves the fatigue endurance compared to the as-sintered state especially at high loading cycle numbers. Singular defects such as slag inclusions or larger pores lower the fatigue endurance the more the better the basic performance of the material is. Kitagawa diagrams are well suited to predict the effect of singular defects if possible interactions between defects are taken into account.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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Cited By Count: 4
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