Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld

Matias Ahonen; Sebastian Lindqvist; Teemu Sarikka; Jari Lydman; Roman Mouginot; Ulla Ehrnstén; Pekka Nevasmaa; Hannu Hänninen

doi:10.1007/978-3-319-68454-3_56

Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld

Matias Ahonen, Sebastian Lindqvist, Teemu Sarikka, Jari Lydman, Roman Mouginot, Ulla Ehrnstén, Pekka Nevasmaa, Hannu Hänninen

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Abstract

Determination of the fracture toughness properties and thermal aging behavior of dissimilar metal weld (DMW) joints is of utmost importance for successful structural integrity and lifetime analyses. This paper presents results from fracture resistance (J-R), fracture toughness (T₀) and Charpy-V impact toughness tests as well as fractography performed for an industrially manufactured narrow-gap DMW mock-up (SA508-Alloy 52-AISI 316L). Tests were performed on post-weld heat treated, 5000 h aged and 10,000 h aged material. The results show that this DMW is tough at the SA 508-Alloy 52 interface, which typically is the weakest zone of a DMW. The DMW joint maintains its high fracture resistance also after thermal aging. Crack propagates for a large part in the carbon-depleted zone (CDZ) of SA 508 but deflects occasionally to the Alloy 52 side due to small weld defects in µm scale. Ductile-to-brittle transition temperature determined from Charpy-V impact toughness tests increases due to thermal aging, but only to a minor extent. No significant change is observed for the T₀ transition temperature due to aging.

Original language	English
Title of host publication	Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
Editors	John H. Jackson, Denise Paraventi, Michael Wright
Publisher	Springer
Pages	733-747
Number of pages	15
Volume	2
ISBN (Electronic)	978-3-319-68454-3
ISBN (Print)	978-3-319-68453-6
DOIs	https://doi.org/10.1007/978-3-319-68454-3_56
Publication status	Published - 1 Jan 2018
MoE publication type	A4 Article in a conference publication
Event	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017 - Portland, United States Duration: 13 Aug 2017 → 17 Aug 2017

Publication series

Series	Minerals, Metals and Materials Series
Number	Part F11
ISSN	2367-1181

Conference

Conference	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017
Abbreviated title	EDM 2017
Country	United States
City	Portland
Period	13/08/17 → 17/08/17

Keywords

Aging
Dissimilar metal weld
Microstructural characterization
Ni-base alloy

Access to Document

10.1007/978-3-319-68454-3_56

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Ahonen, M., Lindqvist, S., Sarikka, T., Lydman, J., Mouginot, R., Ehrnstén, U., Nevasmaa, P., & Hänninen, H. (2018). Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld. In J. H. Jackson, D. Paraventi, & M. Wright (Eds.), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (Vol. 2, pp. 733-747). Springer. Minerals, Metals and Materials Series, No. Part F11 https://doi.org/10.1007/978-3-319-68454-3_56

Ahonen, Matias ; Lindqvist, Sebastian ; Sarikka, Teemu ; Lydman, Jari ; Mouginot, Roman ; Ehrnstén, Ulla ; Nevasmaa, Pekka ; Hänninen, Hannu. / Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld. Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. editor / John H. Jackson ; Denise Paraventi ; Michael Wright. Vol. 2 Springer, 2018. pp. 733-747 (Minerals, Metals and Materials Series; No. Part F11).

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title = "Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld",

abstract = "Determination of the fracture toughness properties and thermal aging behavior of dissimilar metal weld (DMW) joints is of utmost importance for successful structural integrity and lifetime analyses. This paper presents results from fracture resistance (J-R), fracture toughness (T0) and Charpy-V impact toughness tests as well as fractography performed for an industrially manufactured narrow-gap DMW mock-up (SA508-Alloy 52-AISI 316L). Tests were performed on post-weld heat treated, 5000 h aged and 10,000 h aged material. The results show that this DMW is tough at the SA 508-Alloy 52 interface, which typically is the weakest zone of a DMW. The DMW joint maintains its high fracture resistance also after thermal aging. Crack propagates for a large part in the carbon-depleted zone (CDZ) of SA 508 but deflects occasionally to the Alloy 52 side due to small weld defects in µm scale. Ductile-to-brittle transition temperature determined from Charpy-V impact toughness tests increases due to thermal aging, but only to a minor extent. No significant change is observed for the T0 transition temperature due to aging.",

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Ahonen, M, Lindqvist, S, Sarikka, T, Lydman, J, Mouginot, R, Ehrnstén, U , Nevasmaa, P & Hänninen, H 2018, Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld. in JH Jackson, D Paraventi & M Wright (eds), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. vol. 2, Springer, Minerals, Metals and Materials Series, no. Part F11, pp. 733-747, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017, Portland, United States, 13/08/17. https://doi.org/10.1007/978-3-319-68454-3_56

Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld. / Ahonen, Matias; Lindqvist, Sebastian; Sarikka, Teemu; Lydman, Jari; Mouginot, Roman; Ehrnstén, Ulla ; Nevasmaa, Pekka; Hänninen, Hannu.

Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. ed. / John H. Jackson; Denise Paraventi; Michael Wright. Vol. 2 Springer, 2018. p. 733-747 (Minerals, Metals and Materials Series; No. Part F11).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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KW - Aging

KW - Dissimilar metal weld

KW - Microstructural characterization

KW - Ni-base alloy

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Ahonen M, Lindqvist S, Sarikka T, Lydman J, Mouginot R, Ehrnstén U et al. Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld. In Jackson JH, Paraventi D, Wright M, editors, Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Vol. 2. Springer. 2018. p. 733-747. (Minerals, Metals and Materials Series; No. Part F11). https://doi.org/10.1007/978-3-319-68454-3_56