PSI - Issue 58

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 58 (2024) 109–114

© 2024 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 ICSID 2023 Organizers Abstract Ni-based superalloy 718 is especially suitable for high-temperature, high-pressure environments in aviation, where corrosion, creep, and thermal shock resistance are necessary for safe operation. The listed properties of alloy 718 are obtained by heat treatment - precipitation hardening. Heat treatment significantly affects the grain size of the basic gamma solid solution and the structural components of the alloy such as L1 2 gamma prime, DO 22 gamma double prime and BCT delta phase. Their morphology, distribution and degradation affect the mechanical and thermo-mechanical properties of the alloy. The article aims to characterize and quantify the influence of the mentioned structural components on the dynamic properties of the alloy. For this purpose, methods of quantitative metallography using optical (differential interference contrast – DIC and dark field – DF) and scanning electron microscopes (EDS analysis, EDS elemental mapping, etc.) were used. To consider the influence of δ-phase on the dynamic properties (fatigue life) of alloy, blocky shape specimens at starting stage and after applying additional annealing (to increase the volume fraction of the δ-phase) at 800 °C ± 5 °C/72h + cooling in the furnace and the three-point bending fatigue test with the cycle asymmetry parameter R  1, loading frequency f  145 Hz and N f = 2.10 7 as a run out were used. © 2024 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 ICSID 2023 Organizers Keywords: Delta phase; annealing; three-point bending fatigue test; quantitative metallography; SEM analysis 7th International Conference on Structural Integrity and Durability (ICSID 2023) Quantification of structural components of Alloy 718 and their effect on dynamic mechanical properties Juraj Belan a *, Milan Uhríčik a , Alan Vaško a , Lucia Pastierovičová a , Eva Tillová a , Silvia Hudecová a a University of Žilina, Faculty of Mechanical Engineering, Department of Materials Science, Univerzitná 8215/1, Žilina 01026, Slovakia

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

2452-3216 © 2024 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 ICSID 2023 Organizers

2452-3216 © 2024 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 ICSID 2023 Organizers 10.1016/j.prostr.2024.05.018