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在不同工艺参数下,在球墨铸铁QT450-10表面激光熔覆了镍基合金,分析了熔覆层的显微组织和物相组成,研究了熔覆前、后试样的拉伸应力-应变曲线及试样的断口形貌。结果表明,当激光功率为1.6kW、激光扫描速率为400mm·min~(-1)、送粉速率为3.2r·min~(-1)时,熔覆结果较好,基体与熔覆层间形成了良好的冶金结合,无裂纹、气孔;在25℃下,当熔覆层数为1时,熔覆层的显微硬度达到265HV,约为基体硬度的1.5倍;熔覆后试样的断裂部位在基体处,熔覆镍基合金的球墨铸铁的强度得到提高。
Under different technological parameters, Ni-based alloy was laser cladding on the surface of ductile iron QT450-10. The microstructure and phase composition of the cladding layer were analyzed. The tensile stress-strain Curve and specimen fracture appearance. The results show that when the laser power is 1.6kW, the laser scanning rate is 400mm · min -1 and the powder feeding rate is 3.2r · min -1, The formation of a good metallurgical bonding, no cracks, pores; at 25 ℃, when the cladding layer is 1, the micro-hardness of the cladding layer reaches 265HV, about 1.5 times the substrate hardness; after cladding the sample Fracture site at the matrix, the strength of the nickel-based alloy ductile iron is increased.