1. ERTi-2 cladding layer formation on a 5052 plate by a weaving strategy with wire and arc additive manufacturing.
- Author
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Nakajima, Kentaro, Sasahara, Hiroyuki, Nagamatsu, Hideaki, and Abe, Takeyuki
- Abstract
The deposition of cladding titanium (Ti) alloy layers on aluminum (Al) alloy components via wire-arc additive manufacturing (WAAM) has many attractive properties but is also significantly challenging because the deposition of a molten Ti alloy in a high-temperature state causes Ti and Al alloys to melt and mix. This leads to serious problems such as the formation of brittle intermetallic compounds (IMCs), lower forming dimensional accuracy (the formation of beads with side overhang and hump defects), and the generation of cracks and voids in the dissimilar metal interface. This study aimed to comprehensively investigate these challenges, in particular, the effect of WAAM path strategies on the forming dimensional accuracy. A pure Ti bead equivalent to ERTi-2 was deposited on an Al alloy plate equivalent to 5052 using stringer and weaving strategies. As a result, cladding ERTi-2 multi-beads on a 5052 plate without fusion defects were successfully fabricated using weaving strategies. In addition, the formation mechanisms for hump defects and severe spatter were clarified by observing the behavior of the molten pool. We also examined the formation of brittle IMCs and low mechanical properties. Tensile tests results showed an ultimate tensile strength of 54 ± 18 MPa (average ± standard deviation) at the dissimilar metal interface. According to fractographic analysis, the irregular formation of microcracks at the thicker IMC layer reduces bonding strength. The formation of the IMC layer is a result of the concentrated heat input in the directed energy deposition (DED) process, and is not due to the weaving strategy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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