Direct metal laser sintering is a kind of laser powder bed fusion process that emerged as an advanced manufacturing process in the recent era of industry 4.0. This is a rapid manufacturing process where repeated melting and solidification takes place during scanning of the powder bed. The characteristics of the as-built component depend on the melting and solidification behavior which is directly influenced by the processing conditions. Intending to make a superior part in this process, it is indispensable to comprehend the impact of process parameters on temperature distribution, melting and solidification behavior, etc. In the present study, the authors developed an improved three-dimensional transient heat transfer model and studied the influence of hatching space and laser spot overlapping on temperature distribution with molten pool behavior on the AlSi10Mg powder bed. From this investigation, it was observed that the temperature on the AlSi10Mg powder bed decreases with an increase in hatch spaces and conversely with increasing the laser spot overlapping the temperature increases. Also, the molten pool dimension changes with variation of hatch spacing and laser spot overlapping. By combining these studies, the manufactures can able to optimize the hatch space and laser spot overlap along with other processing parameters to fabricate quality components.

中文翻译：

---

铝合金激光粉末床熔合过程中舱口间距和激光光斑重叠对传热的影响

直接金属激光烧结是一种激光粉末床融合工艺，在最近的工业 4.0 时代作为一种先进的制造工艺出现。这是一个快速的制造过程，在扫描粉末床的过程中会反复熔化和凝固。竣工部件的特性取决于直接受加工条件影响的熔化和凝固行为。要想在这个过程中占据优势，就必须了解工艺参数对温度分布、熔化和凝固行为等的影响。 在本研究中，作者开发了一种改进的三维瞬态传热模型，并研究了孵化空间和激光光斑重叠对温度分布和 AlSi10Mg 粉末床上熔池行为的影响。从这项研究中可以看出，AlSi10Mg 粉末床上的温度随着孵化空间的增加而降低，反之随着激光光斑的增加与温度的增加重叠。此外，熔池尺寸随着孵化间距和激光光斑重叠的变化而变化。通过结合这些研究，制造商能够优化舱口空间和激光光斑重叠以及其他加工参数，以制造优质组件。据观察，AlSi10Mg 粉末床上的温度随着孵化空间的增加而降低，反之随着激光光斑的增加与温度的增加重叠。此外，熔池尺寸随着孵化间距和激光光斑重叠的变化而变化。通过结合这些研究，制造商能够优化舱口空间和激光光斑重叠以及其他加工参数，以制造优质组件。据观察，AlSi10Mg 粉末床上的温度随着孵化空间的增加而降低，反之随着激光光斑的增加与温度的增加重叠。此外，熔池尺寸随着孵化间距和激光光斑重叠的变化而变化。通过结合这些研究，制造商能够优化舱口空间和激光光斑重叠以及其他加工参数，以制造优质组件。