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Evolutionary behavior of Haynes 230 powder during laser powder bed fusion cycle and its effect on the mechanical performance of manufactured parts
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AI
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Y
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董
孙
Z
X
王
Y
J
S
DOI：10.1016/j.mtcomm.2023.105384.png)
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Abstract
En 中文
In laser powder bed fusion (LPBF) technology, the laser heat source affects the physical and chemical properties of the metal powder, which in turn affect the mechanical properties of the manufactured part. This study evaluates the evolutionary behavior of Haynes 230 powder during the LPBF cycle and its effect on the mechanical properties of the fabricated parts. In this study, Haynes 230 powder was cycled 14 times using a powder addition method similar to that used in industrial production, and the powder was characterized using laser particle size measurements, scanning electron microscopy, X-ray fluorescence spectroscopy, and X-ray diffractometry. The results showed that the powder particle size increased, the particle size distribution became concentrated during the cycling process, and the average powder particle size increased by 5.79%. The morphology, density, and flowability changed regularly with the cycling process, with the sphericity decreasing by a maximum of 4.2% and the flow time varying by 1.6 s. The phase composition and oxygen content did not change significantly with the oxygen content, increasing by only 94 ppm after 14 cycles. The mechanical properties of the printed specimens were characterized by tensile tests. For this material, flowability is found to be the key factor in the change of the mechanical properties, and the use of the powder addition method in this study can significantly improve the efficiency of powder recycling.
Keywords:
Laser powder bed fusion (LPBF)
Recycling
Haynes 230
Mechanical properties
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