Mr. Yun Tian Profile

Yun Tian

at Peking Univ Third Hospital

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Proceedings Article | 9 October 2021 Presentation + Paper

Laser powder bed fusion of WE43 magnesium alloy porous scaffolds: investigation on densification behavior and dimensional accuracy

Jinge Liu, Bangzhao Yin, Peng Wen, Yun Tian

Proceedings Volume 11892, 118920F (2021) https://doi.org/10.1117/12.2601287

KEYWORDS: Magnesium, Printing, Laser welding, Manufacturing, Laser energy, Metals, Bioalcohols, Additive manufacturing, Laser processing, Fusion energy

Read Abstract +

Laser powder bed fusion (LPBF) is a key metal additive manufacturing process and has attracted increasing attention both in academia and industry. However, it is not easy to achieve high formation quality and high dimensional accuracy meanwhile especially for magnesium alloy due to its high chemical reactivity, low boiling point, low surface tension and high coefficient of thermal expansion. We employed LPBF with various laser power and scanning speed to fabricate WE43 magnesium alloy porous scaffolds with strut sizes of 300, 400 and 500 μm. With a high laser energy input of 60 W and 600 mm/s, the relative density of the struts reached 99.77-99.79 %, while there was a big dimensional error about 33.78- 96.75 % between the designed and the fabricated values of the diameter of struts. With a low laser energy input of 60 W and 1200 mm/s, the dimensional error decreased to 8.13-9.38 %, but the relative density also decreased to 90.41-92.78 % due to lack of fusion. Preset size compensation was used to achieve high densification and accuracy. The offset value of 300, 400, and 500 μm strut was set in advance as 110.4, 92.7 and 89.2 μm respectively. After employing compensation scan strategies, the relative density was 99.64-99.79 % and the dimensional error was 7.16-9.27 % for all the struts. The compressive strength of porous scaffolds ranged from 4.37 MPa to 21.21 MPa with the strut size 300-500 μm, and the compressive strain reached approximately 50 %.

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