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

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

doi:10.1115/PVP2017-66103

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

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

PreussenElektra GmbH

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

7 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 language	English
Title of host publication	ASME 2017 Pressure Vessels and Piping Conference
Subtitle of host publication	Codes and Standards
Publisher	American Society of Mechanical Engineers (ASME)
Number of pages	10
Volume	1A
ISBN (Print)	978-0-7918-5790-8
DOIs	https://doi.org/10.1115/PVP2017-66103
Publication status	Published - 1 Jan 2017
MoE publication type	A4 Article in a conference publication
Event	ASME 2017 Pressure Vessels and Piping Conference, PVP 2017 - Waikoloa, United States Duration: 16 Jul 2017 → 20 Jul 2017

Conference

Conference	ASME 2017 Pressure Vessels and Piping Conference, PVP 2017
Country/Territory	United States
City	Waikoloa
Period	16/07/17 → 20/07/17

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10.1115/PVP2017-66103

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@inproceedings{48ec3dbd1b284b60bda57fa49094e93c,

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

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.",

author = "Jussi Solin and Jouni Alhainen and Tommi Sepp{\"a}nen and Karabaki, {H. Ertugrul} and Wolfgang Mayinger",

note = "Funding Information: The reported work is part of the Technical Programme of E.ON Case on Thermal Transients funded by PreussenElektra GmbH (formerly E.ON Kernkraft GmbH). All experiments were carried out at VTT, mainly by Jouni Alhainen, Tommi Sepp{\"a}nen and Esko Arilahti. Publisher Copyright: {\textcopyright} 2017 ASME. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.; ASME 2017 Pressure Vessels and Piping Conference, PVP 2017 ; Conference date: 16-07-2017 Through 20-07-2017",

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doi = "10.1115/PVP2017-66103",

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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: Codes and Standards. 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 et al.
ASME 2017 Pressure Vessels and Piping Conference: Codes and Standards. Vol. 1A American Society of Mechanical Engineers (ASME), 2017. PVP2017-66103.

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

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T1 - Experimental Research on Cyclic Response, Hold Effects and Fatigue of Stainless Steel

AU - Solin, Jussi

AU - Alhainen, Jouni

AU - Seppänen, Tommi

AU - Karabaki, H. Ertugrul

AU - Mayinger, Wolfgang

N1 - Funding Information: The reported work is part of the Technical Programme of E.ON Case on Thermal Transients funded by PreussenElektra GmbH (formerly E.ON Kernkraft GmbH). All experiments were carried out at VTT, mainly by Jouni Alhainen, Tommi Seppänen and Esko Arilahti. Publisher Copyright: © 2017 ASME. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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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DO - 10.1115/PVP2017-66103

M3 - Conference article in proceedings

SN - 978-0-7918-5790-8

VL - 1A

BT - ASME 2017 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME 2017 Pressure Vessels and Piping Conference, PVP 2017

Y2 - 16 July 2017 through 20 July 2017

ER -

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

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