Erosion studies of plasma sprayed WC-12%Co, Cr₃C₂-25%NiCr, 80%Ni-20%Cr, 87%Al₂O₃-13%TiO₂ coatings on ASTM A36 steel

Abstract

WC-12%Co, Cr 3 C 2 -25%NiCr, 80%Ni-20%Cr, 87%Al 2 O 3 -13%TiO 2 coatings were deposited by Air Plasma Spray (APS) technique on ASTM A36 steel. Erosion behaviour of sprayed coated samples were investigated at three different impact angles (45°, 60°and 90°). The mechanism of erosion was investigated on uncoated and coated samples. The rate of erosion of the substrate first increased with increasing angle of impact and then gradually decreased. But the erosion rate of the coated samples increased steadily. Substrate shows the higher metal removal whereas coating shows the higher erosion resistance. WC-12%Co coated samples performed well in erosion testing and offered best erosion resistance as compared to the substrate and all other coatings. Ductile fracture takes place on substrate material at higher impact angle. Overall, all the coated samples have shown less erosion propensity when compare to the bare one.

Erosive and corrosive wear performance and characterization studies of plasma‐sprayed WC/Cr 3 C 2 coating on SS316

“…Due to substantially plastic deformation, two lip‐shaped bands formed on the surface, which is associated with a high velocity impinging particles and causing material plastic flow in a specific area. Overall, the WC + Cr 3 C 2 composite coating outperforms the WC coating in terms of erosion resistance 35,36 …”

“…Overall, the WC + Cr 3 C 2 composite coating outperforms the WC coating in terms of erosion resistance. 35,36…”

“…It was shown that WC-based coating exhibited better abrasive wear resistance compared to Cr 3 C 2 -based coating, possibly due to the higher hardness of WC particles and better matrix properties of the CoCr binder material. [29][30][31][32][33][34][35][36] Zhang et al 37 compared two distinct coatings on H13 steel, WC10Co4Cr and Cr 3 C 2 -25NiCr, and observed that decarburization during spraying results in the formation of the W 2 C phase in the tungsten carbide coating and the Cr 7 C 3 , Cr 23 C 6 phases in the chromium carbide coating. Bhosalea et al 38 reported the erosive wear mechanism of thermal-sprayed WC-Cr 3 C 2 -Ni coatings on SS316L and found that surface characteristics in both coated samples exhibited evidence of erodent plowing and cutting action of varying intensities, leading to heterogeneous erosion mechanisms.…”

“…Some researchers compared the abrasion wear resistance of WC‐ and Cr 3 C 2 ‐based coatings on steel substrates. It was shown that WC‐based coating exhibited better abrasive wear resistance compared to Cr 3 C 2 ‐based coating, possibly due to the higher hardness of WC particles and better matrix properties of the CoCr binder material 29–36 . Zhang et al 37 .…”