PSI - Issue 39

ScienceDirect Available online at www.sciencedirect.com ScienceDir ct Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com

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

Procedia Structural Integrity 39 (2022) 281–289

© 2021 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 CP 2021 – Guest Editors Abstract The present work deals with the effects of consecutive heat treatments : solution annealing and aging, on the ultrasonic fatigue endurance of the Inconel 718 (I-718). The solution annealing heat treatment was carried out at 1078° C/1hr; then, quenched in water. Afterwards, double aging heat treatment was carried out: firstly, at 720ºC/8hrs and cooling inside furnace for 1hr; then, maintained at 620ºC/8hrs. After the last process, the I-718 specimens were cooled with air to attain room temperature. The results of ultrasonic fatigue endurance show that at higher levels of stresses, up to 746 MPa, the ultrasonic fatigue endurance sensibly increases by a factor of 30 approximately for the heat-treated specimens, compared to the untreated specimens, obtained by others authors. Furthermore, the fracture surfaces were analyzed using Scanning Electron Microscopy (SEM), and the main trends of crack initiation and propagation were studied. © 2021 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 CP 2021 – Guest Editors Keywords: Heat treatments; Inconel 718, Ultrasonic fatigue; Fracture surfaces; Crack initiation. 1. Introduction The alloy I-718 is a nickel-based superalloy that has been developed as a high-strength material for the aircraft industry, particularly destined to high temperatures and corrosion attack applications. Typical uses in aeronautical industry are: turbojet engine parts comprising discs and fan blades, compressor casings, rocket engines [1-6]. Other 7th International Conference on Crack Paths Ultrasonic fatigue endurance of Inconel 718 after the heat treatments: solution annealing and double aging Gonzalo M. Domínguez Almaraz 1, *, Manuel Guzmán Tapia 1 , and Ishvari F. Zuñiga Tello 1 1 Faculty of Mechanical Engineering, University of Michoacan (UMSNH), Santiago Tapia No. 403, 58000 Morelia, Michoacán, Mexico Abstract The present work deals with the effects of consecutive heat treatments : solution annealing and aging, on the ultrasonic fatigue endurance of the Inconel 718 (I-718). The s lution annealing heat treatment was carried out at 1078° C/1hr; then, quenched in water. Afterwards, d uble aging heat treatment was carried out: firstly, at 720ºC/8hrs and cooling inside furnace for 1hr; then, m intained at 620ºC/8hrs. After the last process, the I-718 specimens were cooled with air to attai room temperature. The results of ultrasonic fatigue endurance s ow that at higher levels of stresses, up to 746 MPa, the ultrasonic fatigue nd rance sensibly increases by a factor of 30 pproximately for the eat-treated specimens, compared to the untreated specimens, obtained by others authors. Furtherm re, the fracture surfaces were analyzed using Sca ning Electron Microscopy (SEM), a d the main trends of crack initiation and propagation were studied. © 2021 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 u der responsibility of CP 2021 – Guest Editors Keywords: Heat treatments; Inconel 718, Ultrasonic fatigue; Fracture surfaces; Crack initiation. 1. Introduction The alloy I-718 is a nickel-based superalloy that has been developed as a high-strength material for the aircraft industry, particularly destined to high temperatures and corrosion attack pplications. Typical uses in aeronautical are: turbojet engi e parts comprising disc a fan blades, compressor casi gs, rocket engines [1-6]. Other 7th International Conference on Crack Paths Ultrasonic fatigue endurance of Inconel 718 after the heat treatments: solution annealing and double aging Gonzalo M. Domínguez Almaraz 1, *, Manuel Guzmán Tapia 1 , and Ishvari F. Zuñiga Tello 1 1 Faculty of Mechanical Engineering, University of Michoacan (UMSNH), Santiago Tapia No. 403, 58000 Morelia, Michoacán, Mexico

* Corresponding author. E-mail address: dalmaraz@umich.mx * Corresponding author. E-mail address: dalmaraz@umich.mx

2452-3216 © 2021 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 CP 2021 – Guest Editors 2452-3216 © 2021 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 CP 2021 – Guest Editors

2452-3216 © 2021 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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.098