Technology And Performance Of The Amorphized Steel Surface

Steel is used for many areas, such as the national economy and national defense construction. Because steel is often used in harsh environments, so that is very important to protect the steel material. The study found that iron-based amorphous alloy has a lot of features, such as high hardness, excellent corrosion resistance, low material cost. By surface amorphizing for the steel to obtain the iron-based amorphous, it can improve the performance and longevity of steel. Laser cladding and laser melting technology are able to provide a high enough cooling rate. While it hardly affects the steel, so it will not cause a change in the performance of the steel. Using laser cladding and laser melting technology to amorphous the steel surface has great significance and value. In this paper, we use laser cladding and fused on 45 # steel. Using X-ray diffraction analyzer (XRD), scanning electron microscopy (SEM), micro-hardness, mechanical testing machine, electrochemical workstation to test the performance. We research influence of energy for the laser power and scanning speed, such as surface microstructure, surface microstructure of strength, corrosion resistance. Comparative advantages and disadvantages of laser cladding and laser melting.Experimental results show that the laser power and scanning speed has a great influence for microstructure and properties of laser cladding. With the laser power upgrade, the amorphous phase content increases and reduce defects, surface microhardness increase, enhance corrosion resistance. And with the scanning speed upgrade, the amorphous phase content. surface micro-hardness, corrosion resistance, the first increases and then decreases. They reaches a maximum at 800mm/min. So when the laser power is 500W and the scanning speed is 800mm/min, laser cladding is the best.Experimental results show that the laser power and scanning speed has a great influence for microstructure and properties of laser melting. Writh the laser power upgrade, the amorphous phase content increases and reduce defects, enhance corrosion resistance. Microhardness until 450W is not changed, but when 500W microhardness increase significantly. And with the scanning speed upgrade, the amorphous phase content, surface micro-hardness, corrosion resistance, the first increases and then decreases. They reaches a maximum at 600mm/min. So when the laser power is 500W and the scanning speed is 600mm/min, laser melting is the best.We take laser cladding power as 500W, scanning speed 800mm / min and laser melting power as 500W, scanning speed 600mm / min. It is found that the laser cladding coating glass forming ability, coating density, corrosion resistance are superior to laser melting. Laser cladding and laser melting is close at enhancing the degree of hardness. However, laser melting does not introduce additional elements, more economical. And the surface deformation of steel after treatment is less than laser cladding, which is more suitable for precision machining...