RELATIONSHIP BETWEEN FATIGUE PROPERTIES AND CUTTING PERFORMANCES OF BILAYER TISIN/TIALN TOOL COATING

Impact test is a universal method to characterize the fatigue property of coated tools. For the bilayer TiSiN/TiAlN coated tool, the stress state in the cutting process with different feed rates were explored through cutting experiments. A high-temperature and high-frequency impact test platform was built. Through the impact tests with the introduction of the ‘pre-loading depth’, the fatigue properties and failure mechanisms of coatings under various test conditions were analyzed. Based on the comparative analysis of the results obtained in cutting experiments and impact tests, the mapping relationship between fatigue properties and cutting performances of the coatings was established, thus providing theory and practice foundation for characterization the cutting performance of coated tools under different cutting parameters by high-temperature and high-frequency impact tests.