Abstract
This study explored the effects of Ti3SiC2 on the microstructure and properties of laser cladding coatings using X-ray diffractometer, scanning electron microscope, electrochemical workstation, and UMT-2 wear tester analyses. It was found that with the addition of Ti3SiC2, the reinforcing phases in the composite coating were TiC, Ti(B,C)2, honeycomb-like (Cr, Fe)23C6, and a novel composite ceramic with an “eyeball” structure, which had an inside core of Al2O3 and TiC outer surrounding structure. The microhardness, wear, and corrosion resistance of the composite coating were about 1.35, 2, and 4.3 times those of the original coating, respectively. The main wear mechanisms of the original coating were severe fatigue spalling and microcutting, while the main mechanisms of the composite coating were slight microcutting and the formation of the transferred film.
Highlights
Owing to its appropriate strength, tolerance of design stress, and low cost, 16Mn steel has been widely applied in industry, such as in transportation equipment, mining machines, and chemicals.In most cases, 16Mn steel is subjected to repeated impacts and corrosion wear in working conditions.in order to resist severe wear and increase its service life, its weaknesses, including its low hardness and poor resistance to wear, need to be improved
China), which connected to a three-electrode electrochemical cell
The surface of coating 2 was relatively coarse and covered had a lower density than Fe60 alloy, meaning partial Ti3 SiC2 particles could with some spherical particles
Summary
Owing to its appropriate strength, tolerance of design stress, and low cost, 16Mn steel has been widely applied in industry, such as in transportation equipment, mining machines, and chemicals. Conventional surface treatment techniques, such as thermal spraying [1], cold spraying [2], physical vapor deposition [3], and chemical vapor deposition [4], have been reported to be feasible methods of improving the surface properties of the steel substrate by depositing high-performance coatings on its surfaces These coatings were shown to have high hardness and excellent corrosion and wear resistance, but they are susceptible to being detached from the substrate in aggressive wear working conditions because of the mechanical bonding between them and the substrate. Compared with the above surface strengthening techniques, laser cladding confers the unique advantages of a dense and refined microstructure, little stress deformation, a small heat effect zone, and firm bonding.
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