Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times

Ertugrul Karabaki, Marius Twite, Jussi Solin, Matthias Herbst, Jonathan Mann, Grace M. Burke

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    7 Citations (Scopus)

    Abstract

    Advanced Fatigue Methodologies (AdFaM), a joint project of European research laboratories, vendors and plant operators, was launched in 2014 to build on the results from recent laboratory studies of fatigue behavior of austenitic stainless steels under NPP-relevant conditions that showed improved lifetimes compared to the best fit to test data presented in NUREG/CR-6909, and to further investigate transferability between specimen test results and the fatigue behavior of NPP components during plant operation. In particular, AdFaM has focused on an empirical and mechanistic investigation of the effects of hold times on fatigue life. A small number of previous test results suggest an increase in fatigue life for stabilized grades of austenitic stainless steel when hold times (ranging from several hours to days) are introduced into a test between periods of straincontrolled cyclic loading. Tests incorporating hold times may be more representative of material behavior in NPPs, where temperature transients due to start-ups, shutdowns and major power changes may be separated by long periods of steady state operation. Under AdFaM, fatigue endurance tests incorporating hold times have been completed on stabilized and non-stabilized stainless steel grades (Types 304L and 347) and the mechanisms responsible for the observed variations in fatigue life have been investigated using a range of microscopy techniques. Results confirm a significant extension of fatigue life due to hold times in both stabilized and non-stabilized grades. Life extension appears to be linked to hold hardening observed in cyclic behavior, and this link has been investigated through microstructural characterization of fatigue specimens examined before and after holding at elevated temperature. This project helps to improve the understanding of transferability of results from small specimen tests (without hold times) to analysis of NPP components and provides insights that will contribute towards continuing development of fatigue design curves and analysis methods in Design Codes such as ASME Code Section III and KTA 3201/3211. The AdFaM project is now complete. The valuable results and insights gained from this work demonstrate the significant benefits of collaborative research between various industrial and academic partners in the area of fatigue of NPP materials.
    Original languageEnglish
    Title of host publicationProceedings of ASME 2016 Pressure Vessels and Piping Conference
    PublisherAmerican Society of Mechanical Engineers ASME
    ISBN (Print)978-0-7918-5035-0
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventASME 2016 Pressure Vessels and Piping Conference - Vancouver, Canada
    Duration: 17 Jul 201621 Jul 2016

    Conference

    ConferenceASME 2016 Pressure Vessels and Piping Conference
    CountryCanada
    CityVancouver
    Period17/07/1621/07/16

    Fingerprint

    Stainless steel
    Fatigue of materials
    Experiments
    Austenitic stainless steel
    Research laboratories
    Hardening
    Microscopic examination
    Durability
    Temperature

    Cite this

    Karabaki, E., Twite, M., Solin, J., Herbst, M., Mann, J., & Burke, G. M. (2016). Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times. In Proceedings of ASME 2016 Pressure Vessels and Piping Conference American Society of Mechanical Engineers ASME. https://doi.org/10.1115/PVP2016-63115
    Karabaki, Ertugrul ; Twite, Marius ; Solin, Jussi ; Herbst, Matthias ; Mann, Jonathan ; Burke, Grace M. / Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times. Proceedings of ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers ASME, 2016.
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    abstract = "Advanced Fatigue Methodologies (AdFaM), a joint project of European research laboratories, vendors and plant operators, was launched in 2014 to build on the results from recent laboratory studies of fatigue behavior of austenitic stainless steels under NPP-relevant conditions that showed improved lifetimes compared to the best fit to test data presented in NUREG/CR-6909, and to further investigate transferability between specimen test results and the fatigue behavior of NPP components during plant operation. In particular, AdFaM has focused on an empirical and mechanistic investigation of the effects of hold times on fatigue life. A small number of previous test results suggest an increase in fatigue life for stabilized grades of austenitic stainless steel when hold times (ranging from several hours to days) are introduced into a test between periods of straincontrolled cyclic loading. Tests incorporating hold times may be more representative of material behavior in NPPs, where temperature transients due to start-ups, shutdowns and major power changes may be separated by long periods of steady state operation. Under AdFaM, fatigue endurance tests incorporating hold times have been completed on stabilized and non-stabilized stainless steel grades (Types 304L and 347) and the mechanisms responsible for the observed variations in fatigue life have been investigated using a range of microscopy techniques. Results confirm a significant extension of fatigue life due to hold times in both stabilized and non-stabilized grades. Life extension appears to be linked to hold hardening observed in cyclic behavior, and this link has been investigated through microstructural characterization of fatigue specimens examined before and after holding at elevated temperature. This project helps to improve the understanding of transferability of results from small specimen tests (without hold times) to analysis of NPP components and provides insights that will contribute towards continuing development of fatigue design curves and analysis methods in Design Codes such as ASME Code Section III and KTA 3201/3211. The AdFaM project is now complete. The valuable results and insights gained from this work demonstrate the significant benefits of collaborative research between various industrial and academic partners in the area of fatigue of NPP materials.",
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    Karabaki, E, Twite, M, Solin, J, Herbst, M, Mann, J & Burke, GM 2016, Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times. in Proceedings of ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers ASME, ASME 2016 Pressure Vessels and Piping Conference, Vancouver, Canada, 17/07/16. https://doi.org/10.1115/PVP2016-63115

    Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times. / Karabaki, Ertugrul; Twite, Marius; Solin, Jussi; Herbst, Matthias; Mann, Jonathan; Burke, Grace M.

    Proceedings of ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers ASME, 2016.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    AU - Karabaki, Ertugrul

    AU - Twite, Marius

    AU - Solin, Jussi

    AU - Herbst, Matthias

    AU - Mann, Jonathan

    AU - Burke, Grace M.

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    N2 - Advanced Fatigue Methodologies (AdFaM), a joint project of European research laboratories, vendors and plant operators, was launched in 2014 to build on the results from recent laboratory studies of fatigue behavior of austenitic stainless steels under NPP-relevant conditions that showed improved lifetimes compared to the best fit to test data presented in NUREG/CR-6909, and to further investigate transferability between specimen test results and the fatigue behavior of NPP components during plant operation. In particular, AdFaM has focused on an empirical and mechanistic investigation of the effects of hold times on fatigue life. A small number of previous test results suggest an increase in fatigue life for stabilized grades of austenitic stainless steel when hold times (ranging from several hours to days) are introduced into a test between periods of straincontrolled cyclic loading. Tests incorporating hold times may be more representative of material behavior in NPPs, where temperature transients due to start-ups, shutdowns and major power changes may be separated by long periods of steady state operation. Under AdFaM, fatigue endurance tests incorporating hold times have been completed on stabilized and non-stabilized stainless steel grades (Types 304L and 347) and the mechanisms responsible for the observed variations in fatigue life have been investigated using a range of microscopy techniques. Results confirm a significant extension of fatigue life due to hold times in both stabilized and non-stabilized grades. Life extension appears to be linked to hold hardening observed in cyclic behavior, and this link has been investigated through microstructural characterization of fatigue specimens examined before and after holding at elevated temperature. This project helps to improve the understanding of transferability of results from small specimen tests (without hold times) to analysis of NPP components and provides insights that will contribute towards continuing development of fatigue design curves and analysis methods in Design Codes such as ASME Code Section III and KTA 3201/3211. The AdFaM project is now complete. The valuable results and insights gained from this work demonstrate the significant benefits of collaborative research between various industrial and academic partners in the area of fatigue of NPP materials.

    AB - Advanced Fatigue Methodologies (AdFaM), a joint project of European research laboratories, vendors and plant operators, was launched in 2014 to build on the results from recent laboratory studies of fatigue behavior of austenitic stainless steels under NPP-relevant conditions that showed improved lifetimes compared to the best fit to test data presented in NUREG/CR-6909, and to further investigate transferability between specimen test results and the fatigue behavior of NPP components during plant operation. In particular, AdFaM has focused on an empirical and mechanistic investigation of the effects of hold times on fatigue life. A small number of previous test results suggest an increase in fatigue life for stabilized grades of austenitic stainless steel when hold times (ranging from several hours to days) are introduced into a test between periods of straincontrolled cyclic loading. Tests incorporating hold times may be more representative of material behavior in NPPs, where temperature transients due to start-ups, shutdowns and major power changes may be separated by long periods of steady state operation. Under AdFaM, fatigue endurance tests incorporating hold times have been completed on stabilized and non-stabilized stainless steel grades (Types 304L and 347) and the mechanisms responsible for the observed variations in fatigue life have been investigated using a range of microscopy techniques. Results confirm a significant extension of fatigue life due to hold times in both stabilized and non-stabilized grades. Life extension appears to be linked to hold hardening observed in cyclic behavior, and this link has been investigated through microstructural characterization of fatigue specimens examined before and after holding at elevated temperature. This project helps to improve the understanding of transferability of results from small specimen tests (without hold times) to analysis of NPP components and provides insights that will contribute towards continuing development of fatigue design curves and analysis methods in Design Codes such as ASME Code Section III and KTA 3201/3211. The AdFaM project is now complete. The valuable results and insights gained from this work demonstrate the significant benefits of collaborative research between various industrial and academic partners in the area of fatigue of NPP materials.

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    Karabaki E, Twite M, Solin J, Herbst M, Mann J, Burke GM. Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times. In Proceedings of ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers ASME. 2016 https://doi.org/10.1115/PVP2016-63115