Fracture Toughness of Z3CN20.09M Cast Stainless Steel with Long-Term Thermal Aging

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

doi:10.1007/s11665-017-2882-5

Fracture Toughness of Z3CN20.09M Cast Stainless Steel with Long-Term Thermal Aging

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

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

7 Scopus citations

Abstract

Accelerated thermal aging tests were performed at 400 °C for nearly 18,000 h on Z3CN20.09M cast stainless steel which was used for primary coolant pipes of nuclear power plants. A series of Charpy impact tests were conducted on Z3CN20.09M after different long-term thermal aging time. The test results indicated that the Charpy impact energy of Z3CN20.09M cast stainless steel decreased rapidly at an early stage and then almost saturated after thermal aging of 10,000 h. Furthermore, J-resistance curves were measured for CT specimens of longitudinal and circumferential pipe orientations. It showed that there was no obvious difference in the fracture characteristics of Z3CN20.09M in different sampling directions. In addition, the observed stretch zone width (SZW) revealed that the value of initiation fracture toughness J_SZW was significantly lower than that of fracture toughness J_IC, indicating a low actual crack initiation energy due to long-term thermal aging.

Original language	English
Pages (from-to)	4442-4449
Number of pages	8
Journal	Journal of Materials Engineering and Performance
Volume	26
Issue number	9
DOIs	https://doi.org/10.1007/s11665-017-2882-5
State	Published - Sep 1 2017
Externally published	Yes

Funding

This work was supported by the National Natural Science Foundation of China (Nos. 51435012, 51505325) and the Jiangsu Province Municipal Natural Science Foundation (BK20150280).

Funders	Funder number
National Natural Science Foundation of China	51435012, 51505325
Natural Science Foundation of Jiangsu Province	BK20150280

Keywords

Z3CN20.09M stainless steel
fracture toughness
long-term thermal aging
stretch zone width

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10.1007/s11665-017-2882-5

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title = "Fracture Toughness of Z3CN20.09M Cast Stainless Steel with Long-Term Thermal Aging",

abstract = "Accelerated thermal aging tests were performed at 400 °C for nearly 18,000 h on Z3CN20.09M cast stainless steel which was used for primary coolant pipes of nuclear power plants. A series of Charpy impact tests were conducted on Z3CN20.09M after different long-term thermal aging time. The test results indicated that the Charpy impact energy of Z3CN20.09M cast stainless steel decreased rapidly at an early stage and then almost saturated after thermal aging of 10,000 h. Furthermore, J-resistance curves were measured for CT specimens of longitudinal and circumferential pipe orientations. It showed that there was no obvious difference in the fracture characteristics of Z3CN20.09M in different sampling directions. In addition, the observed stretch zone width (SZW) revealed that the value of initiation fracture toughness JSZW was significantly lower than that of fracture toughness JIC, indicating a low actual crack initiation energy due to long-term thermal aging.",

keywords = "Z3CN20.09M stainless steel, fracture toughness, long-term thermal aging, stretch zone width",

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AU - Yu, Weiwei

AU - Yu, Dunji

AU - Gao, Hongbo

AU - Xue, Fei

AU - Chen, Xu

PY - 2017/9/1

Y1 - 2017/9/1

N2 - Accelerated thermal aging tests were performed at 400 °C for nearly 18,000 h on Z3CN20.09M cast stainless steel which was used for primary coolant pipes of nuclear power plants. A series of Charpy impact tests were conducted on Z3CN20.09M after different long-term thermal aging time. The test results indicated that the Charpy impact energy of Z3CN20.09M cast stainless steel decreased rapidly at an early stage and then almost saturated after thermal aging of 10,000 h. Furthermore, J-resistance curves were measured for CT specimens of longitudinal and circumferential pipe orientations. It showed that there was no obvious difference in the fracture characteristics of Z3CN20.09M in different sampling directions. In addition, the observed stretch zone width (SZW) revealed that the value of initiation fracture toughness JSZW was significantly lower than that of fracture toughness JIC, indicating a low actual crack initiation energy due to long-term thermal aging.

AB - Accelerated thermal aging tests were performed at 400 °C for nearly 18,000 h on Z3CN20.09M cast stainless steel which was used for primary coolant pipes of nuclear power plants. A series of Charpy impact tests were conducted on Z3CN20.09M after different long-term thermal aging time. The test results indicated that the Charpy impact energy of Z3CN20.09M cast stainless steel decreased rapidly at an early stage and then almost saturated after thermal aging of 10,000 h. Furthermore, J-resistance curves were measured for CT specimens of longitudinal and circumferential pipe orientations. It showed that there was no obvious difference in the fracture characteristics of Z3CN20.09M in different sampling directions. In addition, the observed stretch zone width (SZW) revealed that the value of initiation fracture toughness JSZW was significantly lower than that of fracture toughness JIC, indicating a low actual crack initiation energy due to long-term thermal aging.

KW - Z3CN20.09M stainless steel

KW - fracture toughness

KW - long-term thermal aging

KW - stretch zone width

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ER -

Fracture Toughness of Z3CN20.09M Cast Stainless Steel with Long-Term Thermal Aging

Abstract

Funding

Keywords

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