激光沉积成形工艺参数对熔池温度及成形尺寸的影响

Effect of Process Parameters on Both Molten Pool Temperature and Layer Size During Metal Laser Deposition Shaping

采用红外测温仪实时跟踪测量方法实现了钛合金激光沉积成形熔池温度的测量,研究了不同激光功率、扫描速度和送粉速度以及不同扫描路径对熔池区域温度和成形宽度、高度的影响规律。结果表明,随着激光功率和送粉速度的增大,熔池温度升高,成形高度、宽度变大;随着扫描速度的增加,熔池温度下降,成形高度、宽度变小;扫描路径不同会产生不同的温度梯度,温度梯度的不同会直接影响成形件高度;并从能量输入角度分析了熔池区域温度和成形宽度、高度的变化原因。为通过实时红外检测熔池温度调控工艺参数和优选扫描路径来提高成形质量提供了指导依据。

The molten pool temperature of laser deposition shaping titanium alloy was measured by using infrared thermometer real- time tracking measurement method, the effect of process parameters and scanning path on both molten pool temperature and layer size during metal laser deposition forming was researched. The results show that, with the laser power and powder feeding rate increasing, the molten pool temperature,height and width of parts becomes larger;as the scanning speed increasing, the temperature of the molten pool decreases, height and width of parts becomes smaller.Forming height is directly affected by temperature gradient which is affected by different scanning routes; The change reason of both molten pool temperature and layer size was analyzed base on energy input. These results would provide the guidance for optimizing process parameters and scanning path base of the real-time infrared detection molten pool temperature to improve the forming quality.