Numerical investigation on heat transfer of multi-laser processing during selective laser melting of AlSi10Mg
Numerical investigation on heat transfer of multi-laser processing during selective laser melting of AlSi10Mg
复制标题
AlSi10Mg选区激光熔化过程中多激光加工传热的数值研究
DOI：
10.1016/j.rinp.2018.11.075
复制
发表时间：
2019-03-01
影响因子：
5.3
通讯作者：
Kuai, Zezhou
中科院分区：
文献类型：
--
作者：
Liu, Bin;Li, Bao-Qiang;Kuai, Zezhou
多激光选择性激光熔化（SLM）技术由于大大提高了成形效率而受到广泛关注。本研究通过建立三维有限元模型，得到AlSi10Mg粉末在不同扫描次数下的温度场。扫描次数分别为1、2、4。有限元分析考虑了热流密度、对流换热和导热换热。结果表明，当扫描次数N = 2次时，熔池的最高温度、宽度和深度分别增加了0.61%、10.29%和8.92%。当N = 4时，分别增加了6.4%、43.21%和43.73%。获得了适宜的熔池宽度（112.5 μ m）和深度（36.76 μ m）以获得高密度产品。在均匀的工艺条件下，对AlSi10Mg粉末进行了SLM实验，并对SLM制备的样品进行了微观结构研究，以验证物理模型的可靠性。得到了很好的一致性。
Multi-laser selective laser melting (SLM) technology has attracted extensive attention for greatly improving forming efficiency. In this study, a 3D finite element (FE) model is established to obtain the temperature field of AlSi10Mg powder in different number of scans. The number of scans are equal to 1, 2, and 4. The FE analysis is conducted with the heat flux, convective and conductive heat-transfer taken into account. It showed that the maximum temperature, the width, and the depth of the melt pool increased by 0.61%, 10.29%, and 8.92% when the number of scans N used is equal to 2. They increased by 6.4%, 43.21%, and 43.73% when N is 4, respectively. The proper molten pool width (112.5 mu m) and depth (36.76 mu m) were obtained for a high dense product. SLM of AlSi10Mg powder was also experimentally performed using uniform processing conditions, and the microstructures of the SLM-fabricated samples were investigated to verify the reliability of the physical model. Good agreement is obtained.