潜热对激光涂敷过程中温度场的影响

应用自编子程序与通用软件ABAQUSTM联机模拟计算了考虑潜热影响的激光涂敷过程温度场的变化.为定量地考察潜热的影响,使用了考虑潜热及不考虑潜热两种分析模型.计算结果表明,在激光涂敷过程的温度场分析中,潜热的影响不是总可以忽略的,其误差取决于材料在物相转变时交界面温差的范围及材料熔解体积的大小.考虑潜热的有限元模型分析结果和忽略潜热的计算结果比较,前者显示出较低的最高温度、较小的熔池范围和较窄的热影响域.另外,在移动热源作用下潜热的影响比固定热源更为突出.与实验结果比较,证明考虑潜热的计算模型会得出更精确的结果.

Effects of Latent Heat on Temperature Field in Laser Cladding Process

The effects of latent heat on temperature field were investigated via self-developed code joining with ABAQUS~(TM) for laser cladding procedure. And two simulation models for the effects of latent heat on the temperature fields were proposed comparatively, where latent heat was taken into account in one and other not. It is found that the effects of the latent heat are not negligible in the laser cladding process and their errors depend on the temperature range during phase transformations and the size of melted material region. The results of finite element analysis including the latent heat show lower maximum temperature, smaller size of melting pool, and narrower heat affected zone compared with the analysis neglecting the latent heat. In particular, the influences of the latent heat are more violent under moving laser beam action than under stationary laser beam. It is concluded that more accurate results can be obtained by considering latent heat in process analysis.