PSI - Issue 60

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

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ScienceDirect

Procedia Structural Integrity 60 (2024) 510–516

© 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 Ni-base superalloys are designed to withstand excessively harsh conditions such as high temperatures, pressures, and corrosive environments. Although the in-service degradation of these materials has been extensively studied, very little information about their manufacturing aspects is available in the public domain. However, these alloys are susceptible to the generation of defects during prior thermal and mechanical processing. Inadequate attention to these aspects leads to defects during manufacturing. A case study pertaining to such defects in a Ni-base superalloy is presented to highlight the issues and identify recommended actions. © 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) 1.Introduction The realization of advanced power plants and reactors that can operate at high temperatures requires materials that can withstand high temperatures and pressures for extended periods. The materials used in these applications must simultaneously meet the requirements of creep strength, fatigue strength, corrosion resistance, and fracture properties. Of the various alloys developed, a forerunner is the Ni-base superalloy with the nominal chemical composition Ni-22Cr-12Co-9Mo-1Al-0.07C [1], of which the India-specific composition is termed Alloy 617M [2]. Abstract Ni-base superalloys are designed to withstand excessively harsh conditions such as high temperatures, pressures, and corrosive environments. Although the in-service degradation of these materials has been extensively studied, very little information about their manufacturing aspects is available in the public domain. However, these alloys are susceptible to the generation of defects during prior thermal and mechanical processing. Inadequate attention to these aspects leads to defects during manufacturing. A case study pertaining to such defects in a Ni-base superalloy is presented to highlight the issues and identify recommended actions. © 2024 The Authors. Published by ELSEVIER B.V. Peer-review under responsibility of the ICONS 2023 Organizers Keywords: Superalloy, manufacturing defects, abnormal grain growth, incipient melting 1.Introduction The realization of advanced power plants and reactors that can operate at high temperatures requires materials that can withstand high temperatures and pressures for extended periods. The materials used in these applications must simultaneously meet the requirements of creep strength, fatigue strength, corrosion resistance, and fracture properties. Of the various alloys developed, a forerunner is the Ni-base superalloy with the nominal chemical composition Ni-22Cr-12Co-9Mo-1Al-0.07C [1], of which the India-specific composition is termed Alloy 617M [2]. Third International Conference on Structural Integrity 2023 (ICONS 2023) Mitigating manufacturing defects in seamless tubes: A failure analysis perspective Mantosh Mandal a* , B. Aashranth a , M. Arvinth Davinci a,b , Dipti Samantaray a,b , M. Vasudevan a,b Third International Conference on Structural Integrity 2023 (ICONS 2023) Mitigating manufacturing defects in seamless tubes: A failure analysis perspective Mantosh Mandal a* , B. Aashranth a , M. Arvinth Davinci a,b , Dipti Samantaray a,b , M. Vasudevan a,b a Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603012, India b Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400094, India *deepsaroj@igcar.gov.in a Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603012, India b Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400094, India *deepsaroj@igcar.gov.in Keywords: Superalloy, manufacturing defects, abnormal grain growth, incipient melting

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

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.2024.05.070