摘要：

Focus on the question of specific powers for laser cladding, adjusted the ratio of material, The Fe55 alloy powder for laser cladding was prepared by vacuum gas atomization(VIGA). The influence of different atomized gas pressure and diameter of metal delivery tube on powder particle size distribution was studied. Under the optimum technological parameters, the composition and impurity content of the powder were tested. The morphology and phase structure of powder were observed and analyzed by SEM and XRD. The flowability of powder was tested by hall flow meter. Finally, the powder was subjected to laser cladding tests on 42 CrMo substrate, and the hardness of the cladding coating was tested. The results show that when the atomizing gas pressure is 4.0 kPa and the diameter of the metal delivery tube is 6.0 mm, the powder particle size is mainly distributed between 80～600 mesh. The powder has lower impurity content, of which the oxygen content is 274 PPM, the nitrogen content is 296 PPM, and the sulfur content is 157 PPM. Powder morphology is mostly spherical or nearly spherical, with fewer satellite spheres. The powder phase structure is mainly composed of α-Fe,M-(FeCr) solid solution. The flowability of powder is 17 s/50 g. The powder exhibits good laser cladding properties, and the hardness of the cladding coating is between HRC 54.5～57.6.

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