PSI - Issue 26

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 26 (2020) 20–27

© 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 MedFract1 organizers Ultrasonic fatigue tests were carried out on the Inconel alloy 718 on pre-corroded and specimens without pre-corrosion. At high applied stress (up to 746 MPa) the specimens without pre-corrosion show fatigue endurance higher compared with the pre corroded specimens with a factor of 10; whereas at low stress level (close to 510 MPa), the difference is considerably reduced; nevertheless, non-pre-corroded specimens show slightly higher fatigue endurance. Numerical investigations were carried out to obtain the stress concentration factors induced by the corrosion pits and the stress intensity factor in mode I was evaluated using the Stress Interpolation Method. Finally, the fracture surfaces were analyzed in order to identify the principal trends of crack initiation and propagation in this aeronautical alloy, under ultrasonic fatigue testing. © 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 MedFract1 organizers Keywords: Ultrasonic fatigue, Inconel alloy 718 Τ he 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Ultrasonic Fatigue Tests on the Inconel Alloy 718 Gonzalo M. Dominguez Almaraz a, * , Manuel Guzmán Tapia a , Alexiane Dominguez b a Facultad de Ing. Mecánica, Universidad Michoacana de San Nicolás de hidalgo, Santiago Tapia No. 403, Col. Centro, 58000, Morelia, Mexico. b Université Paris -Sud 11, URF Sciences et Techniques, BCST: Biologie Chimie Sciences de la Terre, 15 Rue Georges Clemenceau, 91400 Orsay, France Abstract

1. Introduction

The metallic alloy Inconel 718 has been developed as a high-strength material for the aircraft industry, particularly, for the hot sections of jet engines, such as: compressor, blades and discs, due to its excellent mechanical properties at high temperatures and corrosive resistance. Aeronautical components in turbines, such as blades and discs, undergo extreme operating conditions during flight, including: high temperatures, air or fuel contamination,

* Corresponding author. Tel.: +52 4433223500; fax: +52 4433223500 - 3107. E-mail address: dalmaraz@umich.mx

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 MedFract1 organizers

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 MedFract1 organizers 10.1016/j.prostr.2020.06.004