Effect of thermal aging on the low cycle fatigue behavior of Z3CN20.09M cast duplex stainless steel

Weifeng Chen; Fei Xue; Yang tian; Dunji Yu; Weiwei Yu; Xu Chen

doi:10.1016/j.msea.2015.08.070

Effect of thermal aging on the low cycle fatigue behavior of Z3CN20.09M cast duplex stainless steel

Weifeng Chen, Fei Xue, Yang tian, Dunji Yu, Weiwei Yu, Xu Chen

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Nuclear grade Z3CN20.09M cast duplex stainless steel exhibits enhanced cyclic stress response and prolonged low cycle fatigue life at room temperature after thermal aging at 400. °C for up to 6000. h. The threshold strain amplitude for the onset of secondary hardening is shifted to a lower value after thermal aging. Microstructural observations reveal that fatigue cracks tend to initiate from phase boundaries in virgin specimens, but to initiate in the ferrite phase in aged ones. Denser fatigue striations are found on the fracture surface of fatigued specimen subjected to longer thermal aging duration. These observations are explained in the context of thermal aging induced embrittlement of the ferrite phase and deformation induced martensitic phase transformation in the austenite phase.

Original language	English
Pages (from-to)	263?271-271
Journal	Materials Science and Engineering: A
Volume	646
DOIs	https://doi.org/10.1016/j.msea.2015.08.070
State	Published - Oct 14 2015
Externally published	Yes

Funding

The authors gratefully acknowledge financial support for this work from the National Natural Science Foundation of China (No. 51435012 ) and Ph.D. Programs Foundation of Ministry of Education of China (No. 20130032110018 ). The financial support from National Science and Technology Major Project ( 2011ZX06004-02 ) is also greatly acknowledged.

Funders	Funder number
National Natural Science Foundation of China	51435012
Ministry of Education of the People's Republic of China	20130032110018
National Major Science and Technology Projects of China	2011ZX06004-02

Keywords

Duplex stainless steel
Low cycle fatigue
Thermal aging

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10.1016/j.msea.2015.08.070

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title = "Effect of thermal aging on the low cycle fatigue behavior of Z3CN20.09M cast duplex stainless steel",

abstract = "Nuclear grade Z3CN20.09M cast duplex stainless steel exhibits enhanced cyclic stress response and prolonged low cycle fatigue life at room temperature after thermal aging at 400. °C for up to 6000. h. The threshold strain amplitude for the onset of secondary hardening is shifted to a lower value after thermal aging. Microstructural observations reveal that fatigue cracks tend to initiate from phase boundaries in virgin specimens, but to initiate in the ferrite phase in aged ones. Denser fatigue striations are found on the fracture surface of fatigued specimen subjected to longer thermal aging duration. These observations are explained in the context of thermal aging induced embrittlement of the ferrite phase and deformation induced martensitic phase transformation in the austenite phase.",

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T1 - Effect of thermal aging on the low cycle fatigue behavior of Z3CN20.09M cast duplex stainless steel

AU - Chen, Weifeng

AU - Xue, Fei

AU - tian, Yang

AU - Yu, Dunji

AU - Yu, Weiwei

AU - Chen, Xu

PY - 2015/10/14

Y1 - 2015/10/14

N2 - Nuclear grade Z3CN20.09M cast duplex stainless steel exhibits enhanced cyclic stress response and prolonged low cycle fatigue life at room temperature after thermal aging at 400. °C for up to 6000. h. The threshold strain amplitude for the onset of secondary hardening is shifted to a lower value after thermal aging. Microstructural observations reveal that fatigue cracks tend to initiate from phase boundaries in virgin specimens, but to initiate in the ferrite phase in aged ones. Denser fatigue striations are found on the fracture surface of fatigued specimen subjected to longer thermal aging duration. These observations are explained in the context of thermal aging induced embrittlement of the ferrite phase and deformation induced martensitic phase transformation in the austenite phase.

AB - Nuclear grade Z3CN20.09M cast duplex stainless steel exhibits enhanced cyclic stress response and prolonged low cycle fatigue life at room temperature after thermal aging at 400. °C for up to 6000. h. The threshold strain amplitude for the onset of secondary hardening is shifted to a lower value after thermal aging. Microstructural observations reveal that fatigue cracks tend to initiate from phase boundaries in virgin specimens, but to initiate in the ferrite phase in aged ones. Denser fatigue striations are found on the fracture surface of fatigued specimen subjected to longer thermal aging duration. These observations are explained in the context of thermal aging induced embrittlement of the ferrite phase and deformation induced martensitic phase transformation in the austenite phase.

KW - Duplex stainless steel

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Effect of thermal aging on the low cycle fatigue behavior of Z3CN20.09M cast duplex stainless steel

Abstract

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Keywords

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