PSI - Issue 60

ScienceDirect Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 60 (2024) 298–310 Structural Integrity Procedia 00 (2023) 000 – 000

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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 ICONS 2023 Organizers 10.1016/j.prostr.2024.05.051 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 ICONS 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 ICONS 2023 Organizers © 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 ICONS 2023 Organizers Abstract In recent years, Advanced Ultra Super Critical (AUSC) plants have used Ni-Cr-Co-Mo based alloy 617M for high temperature components like steam piping and rotors, where material resistance against fracture after prolonged exposure in a hostile environment is a matter of concern to the designers. To this end, fracture toughness characterization of the material in as-received and aged conditions using an elastic-plastic fracture mechanics ( J-R curves) approach can provide a significant input towards the component integrity assessments at service conditions. In this study, J-R curves of the alloy 617M have been determined for the as-received and differently aged (up to 20000 h at 710 °C) conditions using compact tension (CT) specimens following ASTM E 1820-13. Repeated tests have been carried out at temperatures 27 °C, 650 °C, 710 °C and 750 °C. The fracture toughness ( J IC ) thus determined, has shown a declining trend with test temperatures. This attributes to the ease of the crack initiation process owing to the ′ induced matrix hardening and subsequent ageing-inducing precipitations of M 23 C 6 carbides at the grain boundaries. Third International Conference on Structural Integrity 2023 (ICONS 2023) Effect of Temperature and Ageing on Fracture Toughness of Alloy 617M Md Rakim a, *, P. Basu a , M. Jana a , S. Choudhury a , A. Mitra a , S. K. Acharyya a , S. A. Krishnan b , A. Moitra b a Department of Mechanical Engineering, Jadavpur University, Kolkata-700032, India b Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India Abstract In recent years, Advanced Ultra Super Critical (AUSC) plants have used Ni-Cr-Co-Mo based alloy 617M for high temperature components like steam piping and rotors, where material resistance against fracture after prolonged exposure in a hostile environment is a matter of concern to the designers. To this end, fracture toughness characterization of the material in as-received and aged conditions using an elastic-plastic fracture mechanics ( J-R curves) approach can provide a significant input towards the component integrity assessments at service conditions. In this study, J-R curves of the alloy 617M have been determined for the as-received and differently aged (up to 20000 h at 710 °C) conditions using compact tension (CT) specimens following ASTM E 1820-13. Repeated tests have been carried out at temperatures 27 °C, 650 °C, 710 °C and 750 °C. The fracture toughness ( J IC ) thus determined, has shown a declining trend with test temperatures. This attributes to the ease of the crack initiation process owing to the ′ induced matrix hardening and subsequent ageing-inducing precipitations of M 23 C 6 carbides at the grain boundaries. * Corresponding author. Tel.: +91-7797323295 E-mail address: mdrakim11953@gmail.com Third International Conference on Structural Integrity 2023 (ICONS 2023) Effect of Temperature and Ageing on Fracture Toughness of Alloy 617M Md Rakim a, *, P. Basu a , M. Jana a , S. Choudhury a , A. Mitra a , S. K. Acharyya a , S. A. Krishnan b , A. Moitra b a Department of Mechanical Engineering, Jadavpur University, Kolkata-700032, India b Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India * Corresponding author. Tel.: +91-7797323295 E-mail address: mdrakim11953@gmail.com