Effects of Process Interruption During Laser Powder Bed Fusion on Microstructural and Mechanical Properties of Fabricated Parts

Date

2022

Authors

Mahtabi, MohammadBagher
Yadollahi, Aref
Stokes, Ryan
Young, Joseph
Doude, Haley
Priddy, Matthew W.
Bian, Linkan

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Abstract

Despite appropriate planning, various incidents can stop the additive manufacturing (AM) process of metals and cause build interruption, such as power outage, lack of powder feedstock, and/or shielding gas to mention a few. Due to the layer-by-layer nature of fabrication, an interruption to the AM process can be resumed from the location where the stoppage occurred. However, build interruption may adversely affect the structural integrity of the fabricated parts, by causing localized failure near the interruption location. This study aims to investigate the influence of build interruption during the laser powder bed fusion (LPBF) process on the microstructural and mechanical properties of Ti-6Al-4V and Al-Si-10Mg specimens. For the Ti-6Al-4V specimens, results indicate that tensile failures near the interruption location are most likely to happen for non-heat-treated specimens in the as-built surface condition. Whereas for the Al-Si- 10Mg specimens, the failure location is more influenced by the prolonged stoppage and air exposure.

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