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Felice, Igor O.; Shen, Jiajia; Barragan, André F.C.; Moura, Isaque A.B.; Li, Binqiang; Wang, Binbin; Khodaverdi, Hesamodin; Mohri, Maryam; Schell, Norbert; Ghafoori, Elyas; Santos, Telmo G.; Oliveira, J.P.
Materials & design, July 2023, 2023-07-00, 2023-07-01, Letnik: 231Journal Article
Display omitted •A novel iron-based shape memory alloy was successfully deposited by wire and arc additive manufacturing.•As-deposited material was predominantly composed by FCC γ phase with a columnar dendritic morphology.•High mechanical performance was observed for yield strength, fracture stress, elongation, cyclic repetibility and hardness.•Uniaxial loading induced the FCC γ → HCP ε phase transformation and resulted in a ductile fracture. Shape memory alloys (SMA) are a class of smart materials with inherent shape memory and superelastic characteristics. Unlike other SMAs, iron-based SMAs (Fe-SMA) offer cost-effectiveness, weldability, and robust mechanical strength for the construction industry. Thus, applying these promising materials to advanced manufacturing processes is of considerable industrial and academic relevance. This study aims to present a pioneer application of a Fe–Mn–Si–Cr–Ni–V-C SMA to arc-based directed energy deposition additive manufacturing, namely wire and arc additive manufacturing (WAAM), examining the microstructure evolution and mechanical/functional response. The WAAM-fabricated Fe-SMAs presented negligible porosity and high deposition efficiency. Microstructure characterization encompassing electron microscopy and high energy synchrotron X-ray diffraction revealed that the as-deposited material is primarily composed by γ FCC phase with modest amounts of VC, ε and σ phases. Tensile and cyclic testing highlighted the Fe-SMA's excellent mechanical and functional response. Tensile testing revealed a yield strength and fracture stress of 472 and 821 MPa, respectively, with a fracture strain of 26%. After uniaxial tensile loading to fracture, the γ → ε phase transformation was clearly evidenced with post-mortem synchrotron X-ray diffraction analysis. The cyclic stability during 100 load/unloading cycles was also evaluated, showcasing the potential applicability of the fabricated material for structural applications.
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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