Microstructures and Properties of Laser Cladding Al-TiC-CeO2 Composite Coatings

Abstract

Al-TiC-CeO2 composite coatings have been prepared by using a laser cladding technique, and the microstructure and properties of the resulting composite coatings have been investigated using scanning electron microscopy (SEM), a 3D microscope system, X-ray diffraction (XRD), micro-hardness testing, X-ray stress measurements, friction and wear testing, and an electrochemical workstation. The results showed that an Al-Fe phase appears in the coatings under different applied laser powers and shows good metallurgical bonding with the matrix. The dilution rate of the coating first decreases and then increases with increasing laser power. The coating was transformed from massive and short rod-like structures into a fine granular structure, and the effect of fine grain strengthening is significant. The microhardness of the coatings first decreases and then increases with increasing laser power, and the maximum microhardness can reach 964.3 HV0.2. In addition, the residual stress of the coating surface was tensile stress, and crack size increases with increasing stress. When the laser power was 1.6 kW, the coating showed high corrosion resistance.

Effect of Rare Earth Oxides on Microstructure and Corrosion Behavior of Laser-Cladding Coating on 316L Stainless Steel

“…Rare earth oxides, some of the hottest modified materials used in the laser-cladding process, can not only optimize the microstructure and refine the grain, but can also improve fatigue, oxidation, wear, and corrosion resistance in various service environments [2][3][4][5]. This has resulted in laser cladding (using the modification of rare earth oxides) becoming a widely used coating preparation method [6][7][8].…”

Microstructure and Corrosion Resistance of PEO Coatings Formed on KBM10 Mg Alloy Pretreated with Nd(NO3)3

“…Figure 10 shows EIS plots and fitting results of the PEO immersion coatings carried out in 3.5 wt % NaCl solution. The corrosion rate was different owing to the greater radius of the capacitive loop [ 33 , 34 ]; the larger the radius of the capacitive loop, the lower the corrosion rate of the coating. It can be seen from Figure 10 a that the coating exhibited high total impedance at the beginning of immersion, which indicated that the coating owned high corrosion resistance.…”

Study on the Measurement of Stress in the Surface of Selective Laser Melting Forming Parts Based on the Critical Refraction Longitudinal Wave

“…It demonstrates that the absolute values of the acoustic-elastic coefficients show a significant dependence on the scanning strategies used in the SLM forming process, and the mechanical properties of the specimen vary with the scanning strategy [27,45]. For the specimen whose mechanical properties are better, the absolute values of the corresponding acoustic-elastic coefficients were less.…”