Experimental Research on Cyclic Response, Hold Effects and Fatigue of Stainless Steel

Jussi Solin, Jouni Alhainen, Tommi Seppänen, H. Ertugrul Karabaki, Wolfgang Mayinger

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

3 Citations (Scopus)

Abstract

Our research on fatigue performance of stainless steel and transferability of laboratory data to nuclear power plant operational conditions continues. The focus is in quantification of time and temperature dependent damage relaxation during holds introduced within strain controlled LCF fatigue tests with niobium stabilized X6CrNiNb1810mod steel. These holds aim to simulate steady state normal operation between fatigue relevant cycles at start-up, shut-down or power changes in PWR primary circuit components, e.g. the pressurizer spray lines and surge line.

Amplified cyclic hardening was observed at strain rates approaching zero at normal operation temperatures (≤325°C). Even more pronounced static hardening is consistently measured during holds in elevated temperatures (≥200°C). Beneficial effects of holds in material endurance were shown five years ago. The latest results suggest another beneficial change in component fatigue performance. In addition to improved material response, de-localization of strain is demonstrated in this paper. Our target is a thermodynamic prediction model for improved assessment of fatigue with normal operation periods. The model should quantify the life extension due to long periods in normal operation at operational temperatures.
Original languageEnglish
Title of host publicationASME 2017 Pressure Vessels and Piping Conference
PublisherAmerican Society of Mechanical Engineers ASME
Number of pages10
Volume1A
ISBN (Electronic)9780791857908
ISBN (Print)978-0-7918-5790-8
DOIs
Publication statusPublished - 1 Jan 2017
MoE publication typeA4 Article in a conference publication
EventASME 2017 Pressure Vessels and Piping Conference, PVP 2017 - Waikoloa, United States
Duration: 16 Jul 201720 Jul 2017

Conference

ConferenceASME 2017 Pressure Vessels and Piping Conference, PVP 2017
CountryUnited States
CityWaikoloa
Period16/07/1720/07/17

Fingerprint

Stainless steel
Fatigue of materials
Hardening
Temperature
Niobium
Nuclear power plants
Strain rate
Durability
Thermodynamics
Steel
Networks (circuits)

Cite this

Solin, J., Alhainen, J., Seppänen, T., Karabaki, H. E., & Mayinger, W. (2017). Experimental Research on Cyclic Response, Hold Effects and Fatigue of Stainless Steel. In ASME 2017 Pressure Vessels and Piping Conference (Vol. 1A). [PVP2017-66103] American Society of Mechanical Engineers ASME. https://doi.org/10.1115/PVP2017-66103
Solin, Jussi ; Alhainen, Jouni ; Seppänen, Tommi ; Karabaki, H. Ertugrul ; Mayinger, Wolfgang. / Experimental Research on Cyclic Response, Hold Effects and Fatigue of Stainless Steel. ASME 2017 Pressure Vessels and Piping Conference. Vol. 1A American Society of Mechanical Engineers ASME, 2017.
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abstract = "Our research on fatigue performance of stainless steel and transferability of laboratory data to nuclear power plant operational conditions continues. The focus is in quantification of time and temperature dependent damage relaxation during holds introduced within strain controlled LCF fatigue tests with niobium stabilized X6CrNiNb1810mod steel. These holds aim to simulate steady state normal operation between fatigue relevant cycles at start-up, shut-down or power changes in PWR primary circuit components, e.g. the pressurizer spray lines and surge line.Amplified cyclic hardening was observed at strain rates approaching zero at normal operation temperatures (≤325°C). Even more pronounced static hardening is consistently measured during holds in elevated temperatures (≥200°C). Beneficial effects of holds in material endurance were shown five years ago. The latest results suggest another beneficial change in component fatigue performance. In addition to improved material response, de-localization of strain is demonstrated in this paper. Our target is a thermodynamic prediction model for improved assessment of fatigue with normal operation periods. The model should quantify the life extension due to long periods in normal operation at operational temperatures.",
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Solin, J, Alhainen, J, Seppänen, T, Karabaki, HE & Mayinger, W 2017, Experimental Research on Cyclic Response, Hold Effects and Fatigue of Stainless Steel. in ASME 2017 Pressure Vessels and Piping Conference. vol. 1A, PVP2017-66103, American Society of Mechanical Engineers ASME, ASME 2017 Pressure Vessels and Piping Conference, PVP 2017, Waikoloa, United States, 16/07/17. https://doi.org/10.1115/PVP2017-66103

Experimental Research on Cyclic Response, Hold Effects and Fatigue of Stainless Steel. / Solin, Jussi; Alhainen, Jouni; Seppänen, Tommi; Karabaki, H. Ertugrul; Mayinger, Wolfgang.

ASME 2017 Pressure Vessels and Piping Conference. Vol. 1A American Society of Mechanical Engineers ASME, 2017. PVP2017-66103.

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

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AU - Mayinger, Wolfgang

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Solin J, Alhainen J, Seppänen T, Karabaki HE, Mayinger W. Experimental Research on Cyclic Response, Hold Effects and Fatigue of Stainless Steel. In ASME 2017 Pressure Vessels and Piping Conference. Vol. 1A. American Society of Mechanical Engineers ASME. 2017. PVP2017-66103 https://doi.org/10.1115/PVP2017-66103