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doi:https://doi.org/10.5781/JWJ.2019.37.6.7    [Epub ahead of print]
Effect of Process Parameters on the Formation of Lack of Fusion in Directed Energy Deposition of Ti-6Al-4V Alloy
Desrilia Nursyifaulkhair*, Nokeun Park*,**, Eung Ryul Baek*,**, Jong-bong Lee***
*School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, Korea
***Pohang Institute of Metal Industry Advancement(POMIA), Pohang, 37666, Korea
*,**Institute of Materials Technology, Yeungnam University, Gyeongsan, 38541, Korea
Correspondence: Eung Ryul Baek  Email: erbaek@yu.ac.kr
Received May 8, 2019  Accepted September 10, 2019  Published online November 26, 2019
ABSTRACT
The effect of different process parameters on the formation of lack of fusion (LOF) in Ti-6Al-4V alloy fabricated using DED was studied. The specific energy was calculated to evaluate the minimal amount of required energy to avoid LOF. The results showed that a specific energy smaller than 2700 J.g-1 led to the formation of LOF; however, a higher specific energy was able to successfully prevent the defect. A smaller amount of specific energy resulted in inadequate heat, which was too low to completely melt the metal powder, and resulted in insufficient penetration depth. Subsequently, LOF was observed between the interface of the deposited layers. Furthermore, a higher powder feed rate had a more significant effect on the formation of LOF than higher laser power.
Keywords: Ti-6Al-4V alloy | Directed energy deposition | Powder feed rate | Laser power | Lack of fusion
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