Abstract
During the process of laser powder bed fusion (LPBF) printing, the energy of heat input have a great influence on the quality of fabricated specimens. In this paper, based on the heat transfer and metallurgical mechanism, a theoretical predicting model of the required laser energy to fabricate high-density LPBF components was established. The theoretical required laser energy density of AlSi10Mg, TC4 and 316L were calculated, which are 51.74 J/mm3, 104.48 J/mm3 and 69.28 J/mm3, respectively. By comparing with the experimental results in the references, it was found that the errors between them are within 10%. In addition, this article discussed the relationship between the VED and the specimen defects, and found that the changing in the VED will alter the types of specimen defects.
Highlights
Laser Powder Bed Fusion (LPBF) is a widely used additive manufacturing technology
Improper printing parameters will reduce the relative density and other printing quality of printed components [4–7]. This limits the further application of LPBF
Liu et al [9] investigated the effect of the laser power on the metallographic structure of AlSi10Mg components
Summary
Laser Powder Bed Fusion (LPBF) is a widely used additive manufacturing technology. During printing, the laser scans the metal powders according to the set path, and the layers are accumulated until the specimen is fabricated successfully. Liverani et al [11] explored the influence of laser power, hatch space and printing direction on the quality of 316L components, respectively, and established the relationship between printing parameters and mechanical properties. In order to explore the relationship between printing parameters and printing quality of components much further, the research objects of scholars have shifted from the macroscopic mechanical properties of the printed component to the internal micromorphology, especially the molten pools. In addition to qualitative analysis, scholars established the relationship between printing parameters and the topography of the molten pool for further quantitative analysis. When investigating the required laser energy to obtain a high relative density printed component, scholars found that many required parameters are difficult to obtain directly through experimental measurement and theoretical derivation, such as the maximum temperature and the temperature gradient in the temperature field of the molten pool.
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