PSI - Issue 52

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 52 (2024) 12–19

© 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 Professor Ferri Aliabadi Abstract Low alloy steels are the most commonly used for construction of nuclear reactor pressure vessels. In this work, axially push-pull low cycle fatigue tests were carried out under ambient temperature using both as-received and aged at 450°C for 1000 hours specimens. The experimental fatigue life prediction models of both as-received and aged specimens were obtained. Fatigue crack initiation, propagation, as well as the role of aging, was discussed based on fracture morphology observation. The experimental results showed that specimens exhibited cyclic hardening followed by cyclic softening before and after aging. Low-cycle fatigue life was noticeably reduced after the aging, while the tensile properties and hardness were almost unaffected by the aging. The degradation of low cycle fatigue behaviour was associated with coarser carbides. © 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 Professor Ferri Aliabadi Keywords: Aging; Low cycle fatigue; Life prediction models Fracture, Damage and Structural Health Monitoring Effect of aging on the low cycle fatigue performance of a low alloy steel Long Jin a , Shang-Lin Zhang b , Xu-Xin Wang b , Qi-Wei Yin b , Ming-Liang Zhu a, *,Fu-Zhen Xuan a a Key Laboratory of Pressure Systems and Safety, Ministry of Education; East China University of Science and Technology, 200237 Shanghai, China b Nuclear Power Institute of China, Chengdu 610213, China

* Corresponding author. Tel.: +86-21-64252910; fax:+ 86-21-64253513. E-mail address: mlzhu@ecust.edu.cn

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 Professor Ferri Aliabadi

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 Professor Ferri Aliabadi 10.1016/j.prostr.2023.12.002