Chemical composition influence on the FeMnCrSi alloy microstructure deposited by HVOF

Cavitation erosion is a mass loss process that occurs in a component subject to a liquid pressure variation. Many studies have been done to evaluate the thermal spray process to reduce cavitation damage in hydraulic components, with some advantages in compare with welding, like non residual stress and thermal cycles formation. In this work some Fe-Mn-Cr-Si alloys, were used to evaluate the chemical composition influence on the microstructure, oxide formation, chemical composition and tensile adhesion. Chemical composition influence on oxide formation, microstructure and cavitation resistance of Fe-Mn-Cr-Si thermally sprayed coatings were evaluated. It was observed a significant reduction on the porosity and area fraction oxide of the coatings with Boron and Nickel addition. A combination of Nickel and Boron improve the wetability of the splats with increase on the tensile adhesion of the coatings, otherwise, higher levels of Boron content reduce the tenacity of the coating, with cracks formation