Abstract
In recent years, global warming is a serious problem. Therefore, Diamond-like carbon (DLC) film has been attracting attention in order to reduce greenhouse gases. However, the properties of DLC coated material are not well understood. This study aimed to examine the mechanism of fatigue fracture and properties of DLC coated material. Bending fatigue test was carried out. Fatigue strength was improved by DLC coating. From the fracture surface observations, it was found that the fracture origin of both virgin and DLC series was slip. There was no difference in the fracture origin between DLC series and virgin series. It was observed that the crack initiation life of DLC series retardate than virgin series by replica method. This reason was thought that the compressive residual stress of depositing DLC film control crack initiation.
