论文部分内容阅读
利用连续波Nd:YAG固体激光在黄铜表面上激光熔覆预置的钴基合金粉末,采用SYSWELD软件对激光熔覆过程中的温度场进行了模拟。在分析过程中采用三维单元,考虑温度变化对热物理参数的影响以及表面对流换热和辐射散热等影响因素,建立了三维有限元模型,得到了熔覆过程中试样表面的温度场分布模拟图。结果表明:温度场模拟等温线呈椭圆形分布,光斑附近等温面较为密集,远离光斑处等温面较稀疏;在其它工艺参数不变的情况下,扫描速度为8 mm/s熔覆过程的稀释率为11.5%,可以获得良好的冶金结合,并进行了试验验证;利用SYSWELD软件的校核功能,获得了扫描速度为6 mm/s和10 mm/s熔覆过程中较为合适的功率分别为2.96 kW和3.82 kW。研究结果对工艺参数的优化和控制熔覆层稀释率提供了借鉴和指导作用。
The temperature field of the laser cladding process was simulated by SYSWELD software by laser cladding the pre-set cobalt-based alloy powder on the surface of the brass with a continuous wave Nd: YAG solid laser. In the process of analysis, the three-dimensional element was adopted. Considering the influence of temperature change on the thermophysical parameters and the influencing factors such as convective heat transfer and radiative heat dissipation, a three-dimensional finite element model was established and the simulation of temperature field distribution on the sample surface Figure The results show that the simulated isotherms of the temperature field are elliptical, the isothermal surface near the spot is dense, and the isothermal surface far away from the spot is sparse. When the other process parameters are constant, the scanning speed is 8 mm / s. The rate of 11.5%, can get a good metallurgical bond, and the experimental verification; using SYSWELD software check function, get the scanning speed of 6 mm / s and 10 mm / s cladding more appropriate power were 2.96 kW and 3.82 kW. The results provide reference and guidance for optimizing the process parameters and controlling the dilution rate of the cladding layer.