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

Ersan, Rauf Batuhan
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.


Kinetics and microstructural analysis of fatigue fracture progress in weld joints of duplex stainless steel grade 2205
Yurtışık, Koray; Gürbüz, Rıza; Department of Metallurgical and Materials Engineering (2013)
Despite its high efficiency, autogenous keyhole welding technique leads to an excessive δ-ferrite formation in as-welded duplex stainless steels that leads to deterioration of the corrosion properties of the material, as well as its toughness. Developing the hybrid plasma-gas metal arc welding procedure for duplex stainless steels, a narrow gap and single-pass weldment on 11 mm-thick duplex stainless steel (grade 2205) plates has been achieved. Contrary to other keyhole techniques, such as Laser beam weldin...
Fatigue Cracking of Hybrid Plasma Gas Metal Arc Welded 2205 Duplex Stainless Steel
Yurtışık, Koray; Tirkeş, Süha (2014-01-01)
Contrary to other keyhole welding applications on duplex stainless steels, a proper cooling time and a dilution were achieved during hybrid plasma gas metal arc welding that provided sufficient reconstructive transformation of austenite without sacrificing its high efficiency and productivity. Simultaneous utilization of keyhole and metal deposition in the hybrid welding procedure enabled us to get an as-welded 11 mm-thick standard duplex stainless steel plate in a single pass. Me examination on hybrid plas...
Characterization of Duplex Stainless Steel Weld Metals Obtained by Hybrid Plasma-Gas Metal Arc Welding
Yurtışık, Koray; Tirkeş, Süha; Gür, Cemil Hakan; Gürbüz, Rıza (FapUNIFESP (SciELO), 2013-07-01)
Despite its high efficiency, autogenous keyhole welding is not well-accepted for duplex stainless steels because it causes excessive ferrite in as-welded duplex microstructure, which leads to a degradation in toughness and corrosion properties of the material. Combining the deep penetration characteristics of plasma arc welding in keyhole mode and metal deposition capability of gas metal arc welding, hybrid plasma - gas metal arc welding process has considered for providing a proper duplex microstructure wi...
Damage relief of ion-irradiated Inconel alloy 718 via annealing
Fincher, Cole D.; Turman, Haley; French, Aaron; Chancey, Matthew; Gigax, Jonathan; Aydoğan Güngör, Eda; Zhao, Dexin; Yadav, Digvijay; Xie, Kelvin; Wang, Yongqiang; Borden, Mike; Shao, Lin; Maloy, S. A.; Pharr, Matt (Elsevier BV, 2020-09-01)
Inconel alloy 718 is a high-strength and corrosion resistant alloy that is commonly used as a beamline vacuum window. The accumulation of irradiation-induced damage substantially decreases the window's service lifetime, and replacing it engenders significant beamline downtime. With this application in mind, herein we examine whether post-irradiation annealing can alleviate irradiation-induced damage of Inconel alloy 718. Inconel alloy 718 was received in a solution annealed state. We then irradiated samples...
Surface modification of tantalum via anodization for orthopedic applications
Uslu, Ece; Ercan, Batur; Department of Metallurgical and Materials Engineering (2020)
Tantalum has excellent corrosion resistance and mechanical properties suitable for orthopedic applications. However, tantalum exhibits bioinert characteristics and cannot promote desired level of osseointegration with juxtaposed bone tissue. To enhance bioactivity of tantalum, nanoscale surface modification via anodization could be a potential approach. In this study, tantalum foils were modified to obtain surface features with different morphologies, i.e. nanotubular, nanodimple, nanoporous and nanocoral, ...
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.