Abstract
Cavitation corrosion resistant coatings are an excellent solution to the cavitation corrosion problem. High entropy alloys provide a new possibility for cavitation resistant coatings due to their excellent comprehensive performance. Laser cladding was employed to synthesize AlCoCrxCuFe (x represents the Cr concentration, x = 0.5, 1.0, 1.5, 2.0) high entropy alloy coatings (HECs) on AISI 304 steel. The phase transformation, microstructure, micro-mechanical properties, and cavitation erosion performance of HECs were studied. Results showed that AlCoCrxCuFe HECs were composed of BCC and FCC duplex phase. The microstructure of HECs showed a typical dendritic structure. The composition segregation of interdendrite structures was observed. Cavitation erosion resistance represented by 20 h volume loss was decreased with the increase in Cr content. AlCoCrxCuFe HECs with the lowest chromium content (AlCoCr0.5CuFe) showed the best cavitation erosion resistance among all samples. The cavitation resistance of AlCoCrxCuFe HECs has good correlation with the mechanical parameter /( is nanohardness, is elastic modulus) and phase formation parameter δ (δ is atomic radius difference). The surface after 20 h of cavitation erosion testing exposed the dendritic structure of BCC phase, which was caused by the destruction of the interdendrite structure by cavitation impact.
Highlights
Cavitation is a common phenomenon in ship propellers, rudder blades, turbine impellers, pumps, and other hydraulic machinery [1]
Chiu K Y et al [5] reported Ni–Ti coatings were synthesized by laser cladding using relatively economical Ni–Ti strips
The results show that Ni–Ti coatings have the characteristics of high hardness, high pressure mark recovery rate, no cracks and no pores, which lead to the high erosion resistance of Ni–Ti coatings
Summary
Cavitation is a common phenomenon in ship propellers, rudder blades, turbine impellers, pumps, and other hydraulic machinery [1]. Formation of the second phase will be reduced due to the lower diffusion rate of atoms in HEAs caused by severe lattice distortion Another unique effect is called the “cocktail effect”, which means that there will be a complex interaction between the principal elements that leads to new characteristics in HEAs [21,22]. Wu C L et al [23] prepared FeCoCrAlNiTix high entropy alloy cavitation erosion resistant coatings using laser cladding. They studied the influences of Ti content on the cavitation erosion behavior of their HEAs and concluded that with the increase in Ti content, FeCoCrAlNiTi2 showed the best cavitation resistance in distilled water, which was due to the hard intermetallic phases Ti2 Ni and NiAl in FeCoCrAlNiTi2. Effect of the micro-mechanical properties (nanohardness, elastic modulus) and phase formation parameter (mixing entropy, atomic radius difference) were attempted to develop a further understanding of the cavitation erosion resistance of HECs
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