Fabrication and Characterization of Wire Arc Additively Manufactured Ferritic-Austenitic Bimetallic Structure

다국어 초록 (Multilingual Abstract)

Bimetallic parts are used in many industrial fields, such as pressure vessels, shipbuilding, aerospace, and automotive industries.
Conventional bimetallic part production involves a combination of two different metals that are joined using weldingand brazing operations. Additive manufacturing technologies offer a cost-effective and innovative manufacturing alternativefor complex 3D-shaped parts that can have multi-material designs for better structural performance. However, the structuralperformance of bimetallic components is primarily influenced by the combination of the employed materials, the interface’smorphology, and interface bonding strength. This work investigated the microstructure and mechanical behavior of a bimetallicthick-walled structure as “WAAM Wall” fabricated by depositing low-alloyed metal-cored wire on the top of 316L stainlesssteel by robotic wire arc additive manufacturing (WAAM) process. The results showed that both low-carbon steel andaustenitic stainless steel SS316L wires are suitable for manufacturing defect-free bimetallic WAAM components, which maywiden the design flexibility to manufacture bi-metallic and or functionally graded WAAM components. However, detailedmicrostructural characterization indicated that martensitic microstructure containing chrome carbides was developed at thebimetallic interface due to an increase in Ni and Cr contents, resulting in a sudden increase of 95% in hardness and a sharpdecrease of 70% in fracture toughness at the interface region compared to the SS 316L side. This high-hardness region alsoresulted in an increase of about 113% and 86% for yield and tensile strengths and a sharp reduction of 69% for elongationvalues in horizontal interface specimens compared to vertical interface specimens.

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