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

6 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

Publication series

Name
PublisherASME, American Society of Mechanical Engineers
Volume1A: Codes and Standards
ISSN (Print)0277-027X

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.
@inproceedings{54f71f7ca9b94e039584fe36bd950280,
title = "Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times",
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.",
author = "Ertugrul Karabaki and Marius Twite and Jussi Solin and Matthias Herbst and Jonathan Mann and Burke, {Grace M.}",
year = "2016",
doi = "10.1115/PVP2016-63115",
language = "English",
isbn = "978-0-7918-5035-0",
publisher = "American Society of Mechanical Engineers ASME",
booktitle = "Proceedings of ASME 2016 Pressure Vessels and Piping Conference",
address = "United States",

}

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

TY - GEN

T1 - Fatigue performance of stainless steels (304l, 347) in experiments simulating NPP operation with hold times

AU - Karabaki, Ertugrul

AU - Twite, Marius

AU - Solin, Jussi

AU - Herbst, Matthias

AU - Mann, Jonathan

AU - Burke, Grace M.

PY - 2016

Y1 - 2016

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.

U2 - 10.1115/PVP2016-63115

DO - 10.1115/PVP2016-63115

M3 - Conference article in proceedings

SN - 978-0-7918-5035-0

BT - Proceedings of ASME 2016 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers ASME

ER -

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