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利用激光熔覆技术在蠕墨铸铁表面制备了钴基合金涂层,用SEM和EDS对熔覆层和结合区进行了组织和成分分析,并利用显微硬度计和摩擦磨损试验机对其进行了显微硬度和抗摩擦磨损性能测试。试验结果表明,当激光功率为3 kW、光斑尺寸为4 mm×2 mm、激光扫描速度v=8 mm/s时,熔覆层没有夹渣和孔隙,熔覆层与基体之间形成了冶金结合;熔覆层晶粒细小,偏析范围小,符合快速凝固的过程。钴基合金涂层可以有效的提高蠕墨铸铁表面的硬度和抗摩擦磨损性能。
Cobalt-based alloy coatings were prepared on the surface of vermicular graphite cast iron by laser cladding. The microstructure and composition of the clad layer and the clad layer were analyzed by SEM and EDS. The microstructure and composition were analyzed by microhardness tester and friction and wear tester Micro-hardness and anti-friction and wear properties of the test. The experimental results show that when the laser power is 3 kW, the spot size is 4 mm × 2 mm and the laser scanning speed is v = 8 mm / s, the cladding layer has no inclusions and voids and the metallurgical layer is formed between the cladding layer and the substrate Combination; cladding layer of small grains, segregation range, in line with the rapid solidification process. Co-based alloy coating can effectively improve the surface hardness and anti-friction and wear properties of vermicular graphite cast iron.