不锈钢表面激光熔覆Co基合金涂层工艺研究

Study on the Process of Laser Cladding Co-based Alloy Coating Prepared on the Surface of Stainless Steel

在410不锈钢阀座密封表面激光熔覆Co基合金涂层,进行金相分析、硬度测试、扫描电镜观察,分析不同Co基粉末在不同的工艺参数下的成形性和组织、性能,以及后续热处理对激光熔覆层的影响,并对得到的改性层进行摩擦学性能测试。结果表明,Co-1和Co-2为主体粉末制得到的熔覆材料具有良好的成形性,随着扫描速度增大,熔覆层宽度减小,硬度增大,裂纹敏感性增大;热处理对熔覆层硬度影响不大,但能够明显降低HAZ的硬度。优化工艺为激光功率3.5kW,扫描速度100~150mm/min,利用Co-1和Co-2为主体粉末制得的熔覆材料进行激光熔覆,然后进行高温回火,可在不锈钢表面获得成型性和耐磨性优异的熔覆涂层。

Co-based alloy coating is prepared on the sealing surface of the seat made by 410-stainless steel.Effects of different Co-based powder and different process parameters and the subsequent heat treatment on the variation of formability and properties of the cladding coatings are analyzed by metallographic analysis,hardness testing and scanning electron microscopy.The result shows that the powder prepared by A and C has has good moldability,and with the increase of scanning speed,the width of the cladding layer decreases,the hardness increases,the cladding cracks tend to increase.The effects of the heat treatment on the hardness of the cladding coating is not obvious,but it can It can significantly reduce the hardness of the HAZ.The optimum technology is laser power 3.5kW,scanning speed 100~150mm/min,the mixtured powder of A and C was prepared for coating by laser cladding,then take the tempering on the cladding coating.We can get the cladding coating meet the requirement on the 410-stainless steel.