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以高碳铬铁,硅铁、WC粉末、钒铁、石墨以及还原铁粉等为预制合金粉末,采用激光熔覆技术,在基体表面制备耐磨性优良的涂层。借助光学显微镜、硬度计以及磨粒磨损试验机等对耐磨涂层的组织和耐磨性能进行研究分析。结果表明:随预制合金粉末块的厚度增加,初晶碳化物M_(23)C_6逐渐增加,指纹状的共晶组织则慢慢减少。当预制块厚度3 mm时,可发现大量规则的碳化物。硬度随之呈递增的变化规律。与此同时,耐磨性则呈先增加后下降的变化规律。当预制块厚度达到3 mm时,其相对耐磨性为基体的36倍,为所有试样中耐磨性最好的。
High-carbon ferrochromium, ferrosilicon, WC powder, vanadium iron, graphite and reduced iron powder as prefabricated alloy powder, laser cladding technology, the substrate surface preparation of excellent wear resistance of the coating. The microstructure and wear resistance of the wear-resistant coating were studied by means of optical microscope, hardness tester and abrasive wear tester. The results show that with the increase of the thickness of preformed alloy powder, the amount of M_ (23) C_6 primary carbides increases gradually and the eutectic microstructure decreases gradually. When the prefabricated block thickness of 3 mm, you can find a large number of regular carbide. The hardness increases with the increase of the law. At the same time, the wear resistance first increases and then decreases. When the preform thickness reaches 3 mm, its relative wear resistance is 36 times that of the matrix, which is the best wear resistance of all specimens.