激光直写标志牌专用熔覆粉末的设计及分析

Design and analysis of the cladding powder for laser direct writing signs

为了研制激光直写标志牌系统所需的专用熔覆粉末,以满足铁路货车用耐候钢Q450NQR1凸字型标志的要求,采用均匀设计与优化的方法,对熔覆合金粉末的成分进行了理论分析和试验验证,取得了不同成分下熔覆层的外观形貌、硬度、腐蚀失重及失重率等数据。结果表明,当合金成分的质量分数为w(Ni)=0.20～0.22,w(Cr)=0.14～0.155,w(Si)=0.01～0.015,w(B)=0.005～0.006、Fe为余量时,所获得的熔覆层外形美观,与基材具有很好的冶金结合,且具有比母材更好的耐大气腐蚀性能。这一结果对激光直接写标志牌系统在铁路货车行业中的应用是有帮助的。

In order to develop special cladding powder for laser direct writing signs, and obtain convex shaped logo on weathering steel Q450NQR1 used in railway freight cars, based on uniform design and optimization, the composition of alloy powder was analyzed in theory and confirmed in experiments, and the data of appearance, hardness, eon＇osion weight loss and corrosion loss rate were obtained for different component. The results indicate that when the mass fraction of alloy composition is w（ Ni ） = 0.20 0.22） ,w （Cr） = 0.14 - 0. 155, w （ Si ） = 0.01 - 0.015, w （ B ） = 0. 005 - 0. 006, and Fe as the remainder, the obtained cladding layer has beautiful appearance, metallurgical bonding with the substrate, and better atmospheric corrosion resistance than the base metal. The result is helpful for application of the system of laser direct writing signs on railway wagons industry.