摘要
通过高速激光熔覆技术采用回形扫描路径方式在27SiMn钢表面制备铁基TY-1涂层,分析不同功率、送粉速度、搭接率耦合下熔池温度与熔覆层厚度以及微观形态之间的关系.利用ANSYS有限元分析软件模拟熔覆过程中的温度场,并在同等条件下进行高速激光熔覆试验,通过光学显微镜分析不同参数下涂层的微观形貌变化规律.结果表明,不同功率、送粉速度和搭接率下熔池温度范围为1 403.1～2 588.5 ℃,涂层厚度范围为50～244μm;涂层晶粒组织随不同参数下熔池温度的增大逐渐形成组织致密的等轴晶和少量柱状晶,当熔池温度达到2 588.5 ℃时容易生成柱状晶或二次枝晶.对比分析出功率、送粉速度、搭接率分别为900 W、13 g/min、60％时,粉末能充分熔化,涂层表面平整,微观组织细密.
Abstract
A TY-1 coating based on iron was developed on the surface of 27SiMn steel through a high-speed laser scanning process.The study examines the interplay between melt pool temperature,cladding layer thickness,and microstructure under varying conditions of laser power,powder feed rate,and scanning speed.Utilizing ANSYS finite element analysis software,the temperature field during the cladding process was simulated.Subsequently,high-speed laser cladding tests were executed under identical parameters,and the micromorphological evolution of the coating was scrutinized using optical microscopy.The results show that the melt temperature is 1 403.1 ℃-2 588.5 ℃,and the coating thickness is 50-244 µm;the dense isoaxial crystals and a few cylindrical crystals are gradually formed with the melt temperature under different parameters,and cylindri-cal or secondary dendrite are easily generated when the melt temperature reaches 2 588.5 ℃.According to the comparative a-nalysis,the power,powder delivery speed and lap rate are 900 W,13 g/min,and 60％respectively,the powder can be fully melted,the coating surface is smooth,and the microstructure is fine.
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