Abstract
The 3D parts printed by the laser powder bed fusion (LPBF) process may have the disadvantages of residual stress, part deformation, and surface roughness. Post-processing is usually required to improve such part characteristics. This study investigated the effects of ultrasonic vibration-assisted compression (UAC) on stainless steel 316L parts fabricated by LPBF. The morphology of the molten pools, microstructure, and hardness by UAC and conventional compression (CC) were evaluated. It was found that UAC was more likely to refine the molten pools than CC. The number of sub-grain boundaries near the compressive surface was increased significantly by UAC. Compared with the CC sample, the UAC-processed specimens showed an increased hardness of 7%.
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This work was supported by the Ministry of Science and Technology of Republic of China, under Contract MOST 109-2221-E-009-029.
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Chung-Wei Cheng: Conceptualization, supervision, and writing-original draft preparation.
Teoh Boon How: Investigation, measurement, and data curation.
Yi-Hsien Liu: Investigation, measurement, and data curation.
Ching-Hua Hung: Conceptualization, supervision, and writing-original draft preparation.
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Cheng, CW., How, T.B., Liu, YH. et al. Effects of ultrasonic vibration-assisted compression of stainless steel 316L produced by laser powder bed fusion. Int J Adv Manuf Technol 117, 159–165 (2021). https://doi.org/10.1007/s00170-021-07620-3
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DOI: https://doi.org/10.1007/s00170-021-07620-3