激光同轴送粉增材较高试样温度场的传热特性

Heat Transfer Characteristics of Temperature Field in Laser Coaxial Powder Feeding Additive Manufacturing Higher Sample

采用ANSYS Mechanical中的ANSYS参数化设计语言(ANSYS Parametric Design Language,APDL)模拟激光同轴送粉增材制造较高试样的温度场,分析其传热特性。结果表明:当试样高度较小时,基板最低温度会随高度增大而增大;当试样高度达到一定数值后,会导致温度逐渐下降;随着试样高度增加,基板高温区域逐步向试样投影区靠拢,范围缩小,但熔池温度略有上升;随着高度增加,节点热循环曲线中谷值温度增加,冷却时降温速率增大。

ANSYS Parametric Design Language(APDL)in ANSYS Mechanical is used to simulate the temperature field of the higher sample made by laser coaxial powder feeding additive manufacturing and analyze its heat transfer characteristics.The results show that when the height of the sample is small,the minimum temperature of the substrate will increase with the increase of the height,but when the height of the sample reaches a certain value,it will gradually decrease.With the increase of the height of the sample,the high temperature region of the substrate gradually approaches to the projection region of the sample,and the range decreases,but the temperature of the molten pool increases slightly.With the increase of height,the valley temperature in the thermal cycle curve increases,and the cooling rate increases.