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本文通过实验研究了镀铬炮钢在功率为2kW的激光束处理时组织与性能的变化。结果表明,光束中心部位镀层组织由柱状晶向等轴晶变化,缺陷减少,致密度提高,硬度降低,光束边缘部分,镀层缺陷集中。在适当的工艺参数条件下,可形成铬向基体的扩散层,其抗蚀性极高,利用电子探针对铬扩散层中Cr、Fe浓度比进行了分析,含Cr量最高达40％。结果还发现,激光处理镀铬钢的扩散层形成条件极为特殊,它是在表层铬未熔融而紧靠铬层的钢基体熔化状态下,即固-液两相界面附近反应的产物。
In this paper, the experimental study of the chrome-plated steel in the power of 2kW laser beam processing organization and performance changes. The results show that the microstructure of the center of the beam changes from columnar to equiaxed, the defects are reduced, the density is increased, the hardness is decreased, and the edge of the beam and the coating defects are concentrated. Under appropriate process parameters, the diffusion layer of chromium into the matrix can be formed, and its corrosion resistance is very high. The concentration of Cr and Fe in the diffusion layer of chromium is analyzed by using an electron probe, and the content of Cr is up to 40%. The results also show that the conditions for forming the diffusion layer of the laser-treated chrome-plated steel are very special. It is the product of the reaction near the solid-liquid interface in the molten state of the steel substrate with the surface layer of chromium unmelted and close to the chrome layer.