Abstract
Fe-based coatings with high V and Cr content were obtained by laser cladding using Fe-based powder with different Cr3C2 and FeV50 content. The results showed that Fe-based coatings were uniform and dense. The constituent phases were mainly composed of α-Fe solid solution with the increase of Cr3C2 and FeV50, γ-Fe and V8C7 phases were achieved. The microstructure of the coatings exhibited a typical dendrite structure. The concentration of C, V and Cr were saturated in dendritic areas, and the other alloying elements were mainly dissolved in the interdendritic areas. The hardness and wear resistance of Fe-based coatings were enhanced with the Cr3C2 and FeV50 addition. The specimen with 15% Cr3C2 and 16% FeV50 had the highest hardness of 66.1 ± 0.6 HRC, which was 1.05 times higher than the sample with 4.5% Cr3C2 and 5% FeV50, and the wear resistance of the former was three times greater than the latter.
Highlights
The diesel engine is getting smaller, and the service environment of the internal components has increased rapidly due to the requirement of the energy conservation and emission reduction [1]
Enhancing the surface wear resistance of the camshaft is an effective solution to improving service life
Laser cladding technology has the advantages of accurate control and small deformation
Summary
The diesel engine is getting smaller, and the service environment of the internal components has increased rapidly due to the requirement of the energy conservation and emission reduction [1]. Laser cladding technology uses a high energy laser beam to melt metal powder materials, and a high performance thick coating with a metallurgical joint to the substrate can be obtained directly with a small amount of subsequent processing [12]. The preparation of high performance coating on the surface of low-cost materials by laser cladding technology can save a great deal of precious metals, which significantly alleviates the issue of energy, resources and has a good prospect of engineering application [14]. This laser cladding process has the potential to replace the traditional carburizing and quenching process to produce camshafts with higher wear resistance
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