论文部分内容阅读
为了研究多道搭接对激光重熔等离子喷涂NiCoCrAl-Y2O3涂层熔化的影响,根据激光重熔的特点,采用ANSYS有限元软件的参数化设计语言,在已有的单道激光重熔温度场模型基础上,建立了TiAl合金表面多道搭接激光重熔连续移动三维温度场有限元模型。温度场的分析结果表明:由于激光扫描的热积累效应,重熔过程中试样的温度越来越高,熔池也越来越大,各扫描道之间存在明显的差异,因此不能获得熔化均匀且稀释率小的高质量重熔层。采用逐道减小激光功率或增大扫描速度的策略可以获得大体相同的各扫描道熔池;采用预热试样法同样可以有效地减轻各扫描道之间熔池的差异。
In order to study the influence of lap lapping on the melting of NiCoCrAl-Y2O3 coating by laser remelting plasma spraying, according to the characteristics of laser remelting, using parametric design language of ANSYS finite element software, Based on the model, the finite element model of three-dimensional temperature field of continuous moving laser remelting for lapped TiAl alloy surface was established. The analysis of the temperature field shows that due to the heat accumulation effect of the laser scanning, the temperature of the sample during the remelting process is getting higher and higher, the melting pool is also getting larger and larger, and there are obvious differences among the scanning channels, therefore, the melting can not be obtained Uniform and low dilution rate of high quality remelted layer. By using the method of reducing the laser power or increasing the scanning speed one by one, substantially the same molten pool of each scanning channel can be obtained; the difference of the molten pool between the scanning channels can also be effectively reduced by using the preheating sample method.