Effect of long-term aging on the fracture toughness of primary coolant piping material Z3CN20.09M

Weiwei Yu; Minyu Fan; Hongbo Gao; Dunji Yu; Fei Xue; Xu Chen

doi:10.1016/j.nucengdes.2017.12.022

Effect of long-term aging on the fracture toughness of primary coolant piping material Z3CN20.09M

Weiwei Yu
, Minyu Fan
, Hongbo Gao
, Dunji Yu
, Fei Xue
, Xu Chen

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

12 Scopus citations

Abstract

In this study, a series of accelerated thermal aging tests were performed on primary coolant piping materials (Z3CN20.09M) at 400 °C for 0, 2000, 5000 and 18,000 h to investigate the resulting microstructure change and fracture toughness. To further assess their fracture toughness, 0.2 mm offset line method and stretch zone width method were both employed to determine the fracture toughness. The results indicated that after long-term thermal aging, round shaped particles and characteristic morphology of spinodal decomposition were found in ferrite, thus resulting in the thermal aging embrittlement of Z3CN20.09M. Subsequently, the J-R curves and J-T curves all decreased significantly with the increasing thermal aging time. Furthermore, the fracture toughness parameters J₅₀, J_SZW(2D), J_SZW(3D) and dJ/dΔa were first decreased rapidly and then slow saturated. In addition, the J_SZW(2D) and J_SZW(3D) values were significantly lower than J_Q while the reduction of the critical crack size based on J_SZW(2D) and J_SZW(3D) parameters was about 30% compared with J_Q, and thus J_SZW was relatively close to the onset of crack initiation.

Original language	English
Pages (from-to)	150-160
Number of pages	11
Journal	Nuclear Engineering and Design
Volume	327
DOIs	https://doi.org/10.1016/j.nucengdes.2017.12.022
State	Published - Feb 2018
Externally published	Yes

Funding

This work was supported by National Natural Science Foundation of China (Grant Number 51435012 , 51505325 ), Jiangsu Province Municipal Natural Science Foundation (Grant number BK20150280 ), the Open Research Funds for the Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering (No. NJ20170012 ).

Keywords

Critical crack size
Fracture toughness
Long-term aging
Primary coolant piping
SZW
Spinodal decomposition

Access to Document

10.1016/j.nucengdes.2017.12.022

Cite this

@article{9c489dd1b68746e5b260291fedad4b2f,

title = "Effect of long-term aging on the fracture toughness of primary coolant piping material Z3CN20.09M",

abstract = "In this study, a series of accelerated thermal aging tests were performed on primary coolant piping materials (Z3CN20.09M) at 400 °C for 0, 2000, 5000 and 18,000 h to investigate the resulting microstructure change and fracture toughness. To further assess their fracture toughness, 0.2 mm offset line method and stretch zone width method were both employed to determine the fracture toughness. The results indicated that after long-term thermal aging, round shaped particles and characteristic morphology of spinodal decomposition were found in ferrite, thus resulting in the thermal aging embrittlement of Z3CN20.09M. Subsequently, the J-R curves and J-T curves all decreased significantly with the increasing thermal aging time. Furthermore, the fracture toughness parameters J50, JSZW(2D), JSZW(3D) and dJ/dΔa were first decreased rapidly and then slow saturated. In addition, the JSZW(2D) and JSZW(3D) values were significantly lower than JQ while the reduction of the critical crack size based on JSZW(2D) and JSZW(3D) parameters was about 30\% compared with JQ, and thus JSZW was relatively close to the onset of crack initiation.",

keywords = "Critical crack size, Fracture toughness, Long-term aging, Primary coolant piping, SZW, Spinodal decomposition",

author = "Weiwei Yu and Minyu Fan and Hongbo Gao and Dunji Yu and Fei Xue and Xu Chen",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

month = feb,

doi = "10.1016/j.nucengdes.2017.12.022",

language = "English",

volume = "327",

pages = "150--160",

journal = "Nuclear Engineering and Design",

issn = "0029-5493",

publisher = "Elsevier",

}

TY - JOUR

T1 - Effect of long-term aging on the fracture toughness of primary coolant piping material Z3CN20.09M

AU - Yu, Weiwei

AU - Fan, Minyu

AU - Gao, Hongbo

AU - Yu, Dunji

AU - Xue, Fei

AU - Chen, Xu

PY - 2018/2

Y1 - 2018/2

N2 - In this study, a series of accelerated thermal aging tests were performed on primary coolant piping materials (Z3CN20.09M) at 400 °C for 0, 2000, 5000 and 18,000 h to investigate the resulting microstructure change and fracture toughness. To further assess their fracture toughness, 0.2 mm offset line method and stretch zone width method were both employed to determine the fracture toughness. The results indicated that after long-term thermal aging, round shaped particles and characteristic morphology of spinodal decomposition were found in ferrite, thus resulting in the thermal aging embrittlement of Z3CN20.09M. Subsequently, the J-R curves and J-T curves all decreased significantly with the increasing thermal aging time. Furthermore, the fracture toughness parameters J50, JSZW(2D), JSZW(3D) and dJ/dΔa were first decreased rapidly and then slow saturated. In addition, the JSZW(2D) and JSZW(3D) values were significantly lower than JQ while the reduction of the critical crack size based on JSZW(2D) and JSZW(3D) parameters was about 30% compared with JQ, and thus JSZW was relatively close to the onset of crack initiation.

AB - In this study, a series of accelerated thermal aging tests were performed on primary coolant piping materials (Z3CN20.09M) at 400 °C for 0, 2000, 5000 and 18,000 h to investigate the resulting microstructure change and fracture toughness. To further assess their fracture toughness, 0.2 mm offset line method and stretch zone width method were both employed to determine the fracture toughness. The results indicated that after long-term thermal aging, round shaped particles and characteristic morphology of spinodal decomposition were found in ferrite, thus resulting in the thermal aging embrittlement of Z3CN20.09M. Subsequently, the J-R curves and J-T curves all decreased significantly with the increasing thermal aging time. Furthermore, the fracture toughness parameters J50, JSZW(2D), JSZW(3D) and dJ/dΔa were first decreased rapidly and then slow saturated. In addition, the JSZW(2D) and JSZW(3D) values were significantly lower than JQ while the reduction of the critical crack size based on JSZW(2D) and JSZW(3D) parameters was about 30% compared with JQ, and thus JSZW was relatively close to the onset of crack initiation.

KW - Critical crack size

KW - Fracture toughness

KW - Long-term aging

KW - Primary coolant piping

KW - SZW

KW - Spinodal decomposition

UR - https://www.scopus.com/pages/publications/85038881506

U2 - 10.1016/j.nucengdes.2017.12.022

DO - 10.1016/j.nucengdes.2017.12.022

M3 - Article

AN - SCOPUS:85038881506

SN - 0029-5493

VL - 327

SP - 150

EP - 160

JO - Nuclear Engineering and Design

JF - Nuclear Engineering and Design

ER -

Effect of long-term aging on the fracture toughness of primary coolant piping material Z3CN20.09M

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this