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HomeMaterials Science ForumMaterials Science Forum Vol. 1000Alteration in the Phase Morphology of Ti-6Al-4V...

Alteration in the Phase Morphology of Ti-6Al-4V Alloy Produced Using Directed Energy Deposition

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Abstract:

The alteration in phase morphology of Ti-6Al-4V alloy fabricated using directed energy deposition (DED) was investigated in this study. Owing to the fast cooling rate during DED, the specimen exhibited the diffusionless transformation products of martensite (α′) and massive (α_m) phases. In the top layer, the α′ exhibited a needle-like morphology with the width of approximately 0.94 μm. Meanwhile, the α_m presented a lamellar structure with α thickness of nearly 0.98 μm. In contrast, the morphology of α′ and α_mstarted to decompose into α+β phase in the bottom layer. Furthermore, the hardness values increased with higher deposition layers. These phenomena could be explained by the effect of repetitive heating, as the nature of DED method during the depositing of new layers. Moreover, it was observed the α thickness of α_m in the bottom layer was finer than that in the top layer due to the higher cooling rate.

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Advanced Materials Research QiR 16

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Periodical:

Materials Science Forum (Volume 1000)

Pages:

375-380

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1000.375

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Online since:

July 2020

Authors:

Desrilia Nursyifaulkhair, Faris Arief Mawardi, Nokeun Park*, Eung Ryul Baek, Sungwook Kim

Keywords:

Cooling Rate, Directed Energy Deposition, Morphology, Repetitive Heating, Titanium Alloy

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