Microstructure, Mechanical, and Electrochemical Properties of SiC Particle Reinforced CoCrFeNiCu High-Entropy Alloy Coatings

Abstract

SiC particle reinforced CoCrFeNiCu high-entropy alloy (HEA) coatings (CoCrFeNiCu(SiC)x, x = 0, 5, 10, 15 wt%) were successfully fabricated on 316L stainless steel via laser cladding technique. The effects of SiC particles on the microstructure, mechanical, and electrochemical properties of CoCrFeNiCu HEA were investigated. The results showed that the as-fabricated CoCrFeNiCu(SiC)x HEA coatings is a FCC structure, and a secondary phase formed of Cr7C3 at the grain boundaries. Grain boundary strengthening enhances the mechanical properties of CoCrFeNiCu(SiC)x HEA coatings. Especially for CoCrFeNiCu(SiC)15 HEA coatings, the microhardness, wear weight, and friction coefficient were 568.4 HV, 0.9 mg, and 0.35, respectively. With the increasing of SiC content, the corrosion resistance of CoCrFeNiCu(SiC)x HEA coatings was enhanced in 3.5% NaCl solution. The CoCrFeNiCu(SiC)10 coatings showed better performance than others when they were evaluated for corrosion. These results indicated that the CoCrFeNiCu(SiC)x HEA coatings could significantly enhance the wear, friction, and corrosion resistance properties of the 316L stainless steel.

Progress on the Properties of Ceramic Phase-Reinforced High-Entropy Alloy Composite Coatings Produced via Laser Cladding

“…The majority of research has concentrated on investigating the impact of laser process parameters on the coating properties of high-entropy alloys, with limited attention given to the exploration of laser process parameters on the coating properties of high-entropy alloys reinforced with ceramic phases. The optimal scanning power and scanning speed based on different systems in the existing literature are summarized as shown in Figure 11, which shows that the optimal laser power concentrates between 1300 and 2000 W and the optimal scanning speed lies in the range of 5-14 mm/s [31,32,34,39,45,46,[51][52][53][54][55]64]. Therefore, this range may provide a reference for the selection of process parameters for the subsequent laser cladding process.…”

“…SiC is an excellent ceramic reinforcement because of its high hardness, excellent wear resistance, superior thermal conductivity, and hightemperature oxidation resistance; it is often selected as the reinforcing phase for metallic materials. Xu et al [53] prepared SiC particle-reinforced CoCrFeNiCu composite coatings on the surface of 316 L stainless steel using the laser melting technique. The CoCrFeNiCu (SiC) x HEA coating is a face-centered cubic structure, and a second phase consisting of Cr 7 C 3 is formed at the grain boundaries.…”