Fracture Toughness of Wire Arc Additive Manufactured Duplex Stainless Steel Grade 2509

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2023-1

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Ersan, Rauf Batuhan

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There are two significant benefits of duplex stainless steels as being corrosion resistant and having enhanced mechanical properties. In virtue of these advantages, they are suitable for industries that deal with aggressive environments. Additive manufacturing is a promising technology as it has considerable amount of advantages. Practicality of wire arc additive manufacturing technique, which is an influential method in term of cost and deposition efficiency, for this grade was researched in this study. The microstructure of this grade is changed because of being exposed to instantaneous heating and cooling, therefore handling of ferrite / austenite ratio is a notable parameter. Complex thermal cycles bring formation of secondary phases which are detrimental for properties. Additionally, used shielding gas during process has also essential impression on microstructure and mechanical properties eventually. Since crack like defects are present in structural materials, evaluation is behooved. At this point fracture toughness steps in as it designates criticality of discontinuities. In this work, fracture toughness tests at -10°C temperature with distinctive constraint conditions were applied to wrought material and additively manufactured coupons which were deposited with different shielding gases. Results together with extensive investigations demonstrate that constraint of single edge notch tension specimen is lower than constraint of single edge notch bend specimen that yields to better resistance for fracture. Moreover, Ar+O2 shielding gas causes oxide inclusions in microstructure which deteriorates crack extension resistance.

Subject Keywords

Duplex Stainless Steels, Fracture Toughness, Wire Arc Additive Manufacturing, Microstructure

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https://hdl.handle.net/11511/102106

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

R. B. Ersan, “Fracture Toughness of Wire Arc Additive Manufactured Duplex Stainless Steel Grade 2509,” M.S. - Master of Science, Middle East Technical University, 2023.