Pores and cracks in the metallic glasses prepared by laser powder bed fusion

Liu, Haishun; Jiang, Ye; Yang, Dengfeng; Jiang, Qi–Chuan; Yang, Weiming

doi:10.1016/j.jmrt.2023.08.061

Cited by 8 publications

(1 citation statement)

References 133 publications

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“…The denudation effect lies in dragging the Both micro-cracks and pores are present in the obtained structures. Micro-cracking is a typical effect of the internal stress induced by the phase transitions and non-uniform cyclic heating during the laser powder bed fusion process on the resulting material's structure [27,28]. It can be seen that the micro-cracking phenomenon is presented largely in He-SLM, which can be attributed to the numerically predicted melt pool depth fluctuations during the LPBF under helium atmosphere and flow [24].…”

Section: Resultsmentioning

confidence: 94%

Comparative Study of Microstructure and Phase Composition of Amorphous–Nanocrystalline Fe-Based Composite Material Produced by Laser Powder Bed Fusion in Argon and Helium Atmosphere

Erutin,

Popovich,

Sufiiarov

2024

Materials

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Laser powder bed fusion (LPBF) is a prospective and promising technique of additive manufacturing of which there is a growing interest for the development and production of Fe-based bulk metallic glasses and amorphous–nanocrystalline composites. Many factors affect the quality and properties of the resulting material, and these factors are being actively investigated by many researchers, however, the factor of the inert gas atmosphere used in the process remains virtually unexplored for Fe-based metallic glasses and composites at this time. Here, we present the results of producing amorphous–nanocrystalline composites from amorphous Fe-based powder via LPBF using argon and helium atmospheres. The analysis of the microstructures and phase compositions demonstrated that using helium as an inert gas in the LPBF resulted in a nearly three-fold increase in the amorphization degree of the material. Additionally, it had a beneficial impact on phase composition and structure in a heat-affected zone. The received results may help to develop approaches to control and improve the structural-phase state of amorphous–nanocrystalline compositional materials obtained via LPBF.

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Section: Resultsmentioning

confidence: 94%