Microstructure and cavitation erosion behavior of FeNiCrBSiNbW coating prepared by twin wires arc spraying process

Effect of Initial Surface Roughness on Cavitation Erosion Resistance of Arc-Sprayed Fe-Based Amorphous/Nanocrystalline Coatings

“…There are also some small pits, micro-cracks, cleavage fracture with river pattern, layer detachment, and a large number of initial tiny scratches and pits due to grinding on the eroded surface (Figure 5f), indicating that it needs more time to roughen the surface and create initiate preferential cavitation erosion initiation sites under the present surface condition. The characteristic of layer detachment on the eroded surface of the coating after 1000 grit grinding reveals that the coating was destroyed mainly in the form of delamination, which was proven in our previous study [17]. From the above results, it may suggest that micro-cracks, pits, detachment of fragments, craters, cracks, pullout of the un-melted particle, and massive exfoliations contribute to the evolution of the cavitation erosion mechanism of the FeNiCrBSiNbW amorphous/nanocrystalline coatings with the increase of the initial surface roughness.…”

“…The chemical composition of the cored wire was the same in Ref [17]. Stainless steel 1Cr18Ni9Ti was selected as the substrate.…”

“…In recent years, considerable efforts have been devoted to investigate the cavitation erosion behavior of Fe-based amorphous/nanocrystalline coatings [13][14][15][16][17][18][19][20][21]. According to [13,18], the high-velocity oxygen-fuel (HVOF) sprayed Fe-based amorphous/nanocrystalline coatings with dense structure and high microhardness were preferable to improve the resistance of cavitation erosion in deionized water.…”

“…Compared with HVOF spraying, arc spraying has the potential to develop high quality Fe-based amorphous/nanocrystalline coatings with lower costs because of its advantages of simple device, flexible operation and high efficiency [22]. In our earlier studies, FeCrBSiNb(Ni/W) amorphous/nanocrystalline coatings were synthesized successfully using the arc spraying process and their cavitation erosion behavior was reported [16,17]. We demonstrated that the cavitation erosion resistance of arc-sprayed Fe-based amorphous/nanocrystalline coating deteriorated with increasing annealing temperature [11].…”

Effects of post annealing on the microstructure, mechanical properties and cavitation erosion behavior of arc-sprayed FeNiCrBSiNbW coatings

“…A series of Fe-based amorphous coatings were prepared by arc spraying process recently. The investigation showed they had higher hardness, better corrosion, wear and cavitation erosion resistance compared to the conventional crystalline materials [9][10][11][12][14][15][16][17][18].…”