PSI - Issue 51

ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 51 (2023) 109–114

© 2023 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 ICSID 2022 Organizers Abstract The article deals with the effect of applied fatigue load with different cycle asymmetry parameters R, test temperature and loading frequency on fatigue crack initiation in IN718 superalloy. For this purpose, four sets of experimental samples were produced. The first and second sets of samples with cycle asymmetry parameter R = -1 were subjected to fatigue tests at loading frequency f  20,000 kHz and ambient temperature, respectively f  64 Hz and a temperature of 700 °C. The third and fourth sets of samples with cycle asymmetry parameter R  1 with loading frequency f  150 Hz and ambient temperature, respectively after applying annealing 800 °C/72 hours. SEM fractography analysis was performed on all samples to define the fatigue crack initiation mechanism. © 2023 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 ICSID 2022 Organizers Keywords: Fatigue loading mode; test temperature, load frequency, fatigue crack initiation, SEM fractography 1. Introduction Nickel-base superalloy IN718 is a poly-component hardenable alloy based on Ni-Fe-Cr (Davis 2000). Unlike other commonly commercially used superalloys (Nimonic 80A, IN625, IN750X, IN713, etc.), which are reinforced with a stable coherent precipitate  -phase (Ni 3 Al - crystallizing in L1 2 lattice) dispersed in the basic  -matrix, superalloy IN718 is hardened by a metastable  -phase (Ni 3 Nb - crystallizing in the DO 22 lattice), which transforms into a stable δ-phase at temperatures above 650-700 ° C (Ni 3 Nb - BCT lattice) (Gaddes et al., 2010, Chen et al., 2020, Belan 2016). Abstract The article deals with the effect of applied fatigue load with different cycle asymmetry parameters R, test temperature and loading frequency on fatigue crack initiation in IN718 superalloy. For this purpose, four sets of experimental samples were produced. The first and second sets of samples with cycle asymmetry parameter R = -1 were subjected to fatigue tests at loading frequency f  20,000 kHz and ambient temperature, respectively f  64 Hz and a temperature of 700 °C. The third and fourth sets of samples with cycle asymmetry parameter R  1 with loading frequency f  150 Hz and ambient temperature, respectively after applying annealing 800 °C/72 hours. SEM fractography analysis was performed on all samples to define the fatigue crack initiation mechanism. © 2023 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 ICSID 2022 Organizers Keywords: Fatigue loading mode; test temperature, load frequency, fatigue crack initiation, SEM fractography 1. Introduction Nickel-base superalloy IN718 is a poly-component hardenable alloy based on Ni-Fe-Cr (Davis 2000). Unlike other commonly commercially used superalloys (Nimonic 80A, IN625, IN750X, IN713, etc.), which are reinforced with a stable coherent precipitate  -phase (Ni 3 Al - crystallizing in L1 2 lattice) dispersed in the basic  -matrix, superalloy IN718 is hardened by a metastable  -phase (Ni 3 Nb - crystallizing in the DO 22 lattice), which transforms into a stable δ-phase at temperatures above 650-700 ° C (Ni 3 Nb - BCT lattice) (Gaddes et al., 2010, Chen et al., 2020, Belan 2016). 6th International Conference on Structural Integrity and Durability (ICSID 2022) The effect of loading mode on fatigue crack initiation of IN718 superalloy Juraj Belan a *, Milan Uhríčik a , Alan Vaško a , Lucia Pastierovičová a , Eva Tillová a a University of Žilina, Faculty of Mechanical Engineering, Department of Materials Science, Univerzitná 8215/1, Žilina 01026, Slo vakia 6th International Conference on Structural Integrity and Durability (ICSID 2022) The effect of loading mode on fatigue crack initiation of IN718 superalloy Juraj Belan a *, Milan Uhríčik a , Alan Vaško a , Lucia Pastierovičová a , Eva Tillová a a University of Žilina, Faculty of Mechanical Engineering, Department of Materials Science, Univerzitná 8215/1, Žilina 01026, Slo vakia

* Corresponding author. Tel.: +421-41-513-2631. E-mail address: juraj.belan@fstroj.uniza.sk * Corresponding author. Tel.: +421-41-513-2631. E-mail address: juraj.belan@fstroj.uniza.sk

2452-3216 © 2023 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 ICSID 2022 Organizers 2452-3216 © 2023 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 ICSID 2022 Organizers

2452-3216 © 2023 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 ICSID 2022 Organizers 10.1016/j.prostr.2023.10.075