Study of W-Co ODS coating on stainless steels by mechanical alloying

Tungsten-based coatings have attracted considerable interest in recent years for industrial applications because of superior wear resistance. In this study, the W-Co oxide dispersion strengthened (ODS) coating on stainless steels by mechanical alloying (MA) has been investigated. The different reinforced particles (Y2O3, TiC) have been introduced to the W-Co coating layer as dispersion strengthening during mechanical alloying. The results showed that the formation of the (W,Co)C, Co7W6 and Co3W phases was generated after a long milling duration. The use of Y2O3 dispersed particles in the coating layer demonstrated homogenous distribution of microstructure and an increase of mechanical properties. However, the coating with TiC reinforcement has a significant change in distribution of the microstructure and composition and formed voids or micro-cracks, which decrease densification and hardness of the coating materials. The W-Co ODS coating by mechanical alloying is one of the most promising coating methods for enhanced wear resistance on stainless steels.