PSI - Issue 42

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 42 (2022) 1567–1575

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 © 2020 The Authors.Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Rotating Bending Fatigue; Inconel718; Dwell Fatigue 1. Introduction The use of nickel alloys has became widespread in many industries during this last century, nickel with it’s alloys provides relatively better mechanical properties than conventional ferrous alloys for various industrial applications. Especially with it’s decent high temperature oxidation and mechanical resistance makes this alloy the material of choice for engine applications. An example for mostly used alloy in turbine engine hot sections is Inconel718 is a niobium-modified nickel based superalloy which will be examined in this work. In gas turbine engines, materials are exposed to many different deformation factors. These can be vary depending on materials service conditions, for Nickel based turbine parts, mostly moving parts can be exposed to creep, fatigue, corrosion deformation modes. For understanding material behavior various procedures can be applied in term of mechanical properties tensile tests, creep Abstract The ech nical property of Inconel718 is xamined in terms of fatigue behavior. The ma concern of this wo k is to de ermine the material's fatig e p perti s under pure bending fatigue conditions with additional interruptio s a d thermal effects. Test conditions will include ro m temperature, 450°C, and dwell ti es to simul te the ma er al's operating environment in he engi e application. Addi ion l to fatigue te ing h rdness measurements and nano ndent tion testing were perf rmed at ambient temperature. Fractographic and micr structural xaminations of the tested specimens are p rformed with an optical microscope and SEM (scanning electron microscope) to understand the material's reaction to different deformation factors. © 2020 The Authors.Published by Els vier .V. This is an ope acces article under the CC BY-N -ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) P er-review under r sponsibility of 23 European Conference on Fracture - ECF23 Keywords: Rotating Bending Fatigue; Inconel718; Dwell Fatigue 1. Introduction The use of nickel alloys has became widespread in many industri s d ring thi last cent ry, ickel with it’s alloys provides relatively better mechanical p operties th n conventional ferrous alloys for various industrial applications. Especially with it’s de ent high temperature xidation and mechanical resista ce makes this alloy the material of ch ice for engine applications. An example for mostly used alloy i turbine engine hot sectio s s Inconel718 is a niobium-modified nickel bas d superalloy which will be examined in this work. I gas turbine ngines, materials are exposed to many different deformation factor . These can b vary de ending on materials service condition , f Nickel based turbine parts, m stly m ving parts can be exposed to cr ep, fatigue, corrosion deformation modes. For understanding material behavior various procedures can be applied in term of mechanical properties tensile tests, creep 23 European Conference on Fracture - ECF23 Investigation of the Effect of Dwell Period in Load Controlled Fatigue Tests of Inconel718 Superalloy Numan Berat Yondu a , Prof. Murat Baydoğan b a Msc. Material and Process Development Engineer, TEI Esentepe Mah. Cevre Yolu Bulv., Eskişehir 26210, TURKEY b Professor Metallurgical and Material Engineering , İstanbul Technical University, Ayazağa Kampüsü Maslak, Istanbul 34469, TURKEY Abstract The mechanical property of Inconel718 is examined in terms of fatigue behavior. The main concern of this work is to determine the material's fatigue properties under pure bending fatigue conditions with additional interruptions and thermal effects. Test conditions will include room temperature, 450°C, and dwell times to simulate the material's operating environment in the engine application. Additional to fatigue testing hardness measurements and nano indentation testing were performed at ambient temperature. Fractographic and microstructural examinations of the tested specimens are performed with an optical microscope and SEM (scanning electron microscope) to understand the material's reaction to different deformation factors. 23 European Conference on Fracture - ECF23 Investigation of the Effect of Dwell Period in Load Controlled Fatigue Tests of Inconel718 Superalloy Numan Berat Yondu a , Prof. Murat Baydoğan b a sc. Materi l Process Development Engineer, TEI Esentepe Mah. Cevre Yolu Bulv., Eskişehir 26210, TURKEY b Professor Metallurgical and Material Engineering , İstanbul Technical University, Ayazağa Kampüsü Maslak, Istanbul 34469, TURKEY

2452-3216© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 2452-3216© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.198