| Summary: | Recently Ultra High Strength Steel sheet (UHSS) has been adopted in automotive stamping industry to reduce the weight and enhance the safety of automobile. However, the application of the UHSS sheet faced some difficulty such as die wear and related problems due to high contact pressure on the die surface during the stamping process. In this study, wear tests of pin-on-disc (POD) type were performed to evaluate wear characteristics for the UHSS sheets under dry and lubricated conditions. For five kinds of coatings (TiCN, CrN, TiAlCrN, TiN and TD) on the SKD11 substrate and the uncoated substrates, wear resistances of those die materials under relatively contact sliding with three UHSS sheets was evaluated by the wear chacteristics; the wear mass loss, the curve between the coefficient of friction, sliding distance, and galling initiation distance. Among those coatings, the CrN coating shows the best anti-wear performances, respectively.
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