Effect of chromium content on microstructure, mechanical and erosion properties of Fe-Cr-Ti-Mo-C-Si coating

Abstract In the present study, Fe alloy Fe-Cr-Ti-Mo-C-Si based coatings were deposited on 316L stainless steel substrate using High Velocity Oxygen fuel coating. The microstructure analysis of powder and coated samples, adhesion pull off strength, micro-hardness, and erosion wear resistance properties of the coatings were investigated. The effect of adding chromium on the properties of coating has been studied. The finding of results indicated that the hardness of the coating was much more i.e. approx. 239.78 % of hardness of substrate 316L stainless steel material. Further, increase in 5 wt. % of chromium in the Fe based coating increased the hardness by 24.8%. The adhesion pull off strength of coating material was increased by 70 % with the addition of 5 wt. % chromium. The erosion wear rate of coating and substrate material was decreased with the increase in chromium content and increased with the increase in impact velocity. However, in case of impingement angle, the erosion wear rate was increased for the increase in impingement angle from 0-60° but later decreased at 90°. The study shows that the addition of chromium in Fe-based coating can enhance hardness, adhesion pull off strength and wear resistance properties.