Nodular cast irons are technologically important materials and are used extensively in automotive industry. Defects produced during casting process often play a dominant role in limiting mechanical properties and fatigue life under cyclic loading in cast alloy components. Surface modification processes are increasingly used to fully exploit material potential in fatigue critical applications because fatigue strength is sensitive to surface conditions. In this study the effects of surface condition on the fatigue life of nodular cast iron were evaluated under cyclic plane bending with maximum stress reached at the surface of interest. The results show differences in fatigue strength, which are associated with the surface conditions. The characteristics of the surface layers of the test specimens with different surface condition were examined by metallography. Selected fracture surfaces were investigated to determine the initiation location of fatigue cracks.
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