摘要
为了解决机场供油管网材料激光增材制造过程中,由于温度引起的增材缺陷等问题,本文建立了激光增材制造机场供油管网的温度场仿真模型。模型中考虑了材料热物性参数随温度的变化和熔化潜热,通过生死单元法模拟激光增材制造过程中增材层的堆积过程。结果表明:熔池的纵截面熔池形貌呈现拖尾状,而横截面熔池形貌呈“碗形”。随着激光扫描速度的增大,熔池的最高温度降低,熔池的宽度、长度均逐渐减小。沿着增材层厚度方向从表面到基体,温度逐渐降低,温度梯度在靠近基体与增材层交界处达到了峰值;随着激光扫描速度的提高,该路径的温度整体下降,而且温度梯度的峰值也下降。沿着增材方向,增材层表面的最高温度呈逐渐上升的趋势,且随着激光扫描速度的提高,该路径的整体温度降低且温度分布趋于平缓。
In order to solve the problem of additive defects caused by temperature during the laser additive manufacturing process of airport fuel pipeline materials, the simulation model of the temperature field of the laser additive manufacturing airport fuel supply pipeline was established. The model considered the change of the material’s thermal properties with temperature and the latent heat of fusion. The incremental accumulation process of increasing layers in laser additive manufacturing was simulated by the birth-death element method. The results show that the shape of longitudinal section of molten pool is trailing, while that of cross section is "bowl". With the increase of laser scanning speed, the maximum temperature of the molten pool decreases, and the width and length of the molten pool decrease gradually. The temperature decreases gradually from the surface to the substrate along the thickness direction of the increasing layer, and the temperature gradient reaches a peak at the junction of the base metal and the increasing layer. With the increase of laser scanning speed,the temperature of this path decreases as a whole, and the peak value of the temperature gradient also decreases. Along the direction of increasing material, the maximum temperature on the surface of increasing material is increasing gradually, and with the increase of laser scanning speed, the overall temperature of the path decreases and the temperature distribution tends to be gentle.
作者
庞铭
浮艺旋
PANG Ming;FU Yixuan(Department of Airport,Civil Aviation University of China,Tianjin 300300,China)
出处
《热加工工艺》
北大核心
2022年第7期119-123,127,共6页
Hot Working Technology
关键词
激光增材制造
激光扫描速度
温度场
laser additive manufacturing
laser scanning speed
temperature field
