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Abstract

The mechanical and tribological properties were conducted to investigate surface nanocrystalline of martensite steel with hardness of 5 GPa by using sandblasting technique at 500 °C. The average grain size of surface is 30 nm. In contrast, the average grain size of the martensite steel surface, which processed by sandblasting at room temperature and post-annealing at 500 °C, is 112 nm. Fine grains and Fe3C phase in situ form during sandblasting at 500 °C that is favor for producing nanoscale structure of the martensite steel. The nanostructure surface of the martensite steel has higher hardness and better wear resistance.