The role of secondary phases on SCC initiation of Alloy 718 in simulated PWR primary water

Tianyu Zhu; Jiamei Wang; Miao Song; Quanyao Ren; Xi Qiu; Yuanming Li; Chuanbao Tang; Hongpu Yi; Jing Zhang; Wenxi Tian; Y. U. Ang; Xianglong Guo

doi:10.1016/j.corsci.2025.112930

The role of secondary phases on SCC initiation of Alloy 718 in simulated PWR primary water

Tianyu Zhu
, Jiamei Wang
, Miao Song
, Quanyao Ren
, Xi Qiu
, Yuanming Li
, Chuanbao Tang
, Hongpu Yi
, Jing Zhang
, Wenxi Tian
, Y. U. Ang
, Xianglong Guo

School of Energy and Power Engineering

Shanghai Jiao Tong University
Nuclear Power Institute of China
Ltd.

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

7 Scopus citations

Abstract

Stress corrosion cracking (SCC) initiation behavior of Alloy 718 with different precipitates was studied by slow strain rate tensile testing (SSRT) in a simulated pressurized water reactor (PWR) primary water environment. It was found that both nano-precipitates (γ', γ'' phases) and δ phases enhanced the SCC susceptibility. Nano-precipitates significantly suppressed the interior slip and increased the local stress concentration at grain boundaries (GBs), thus promoting the initiation of intergranular (IG) cracks. GBs oriented perpendicular to the loading direction favored IG crack propagation. Preferential oxidation of the δ phases and the δ/γ interface were precursors to crack initiation, thereby increasing the SCC susceptibility. The shape of δ phases affected the oxidation degree, and more severe oxidation was observed on needle-like δ phases.

Original language	English
Article number	112930
Journal	Corrosion Science
Volume	252
DOIs	https://doi.org/10.1016/j.corsci.2025.112930
State	Published - 1 Aug 2025

Keywords

AFM
Alloy 718
Crack initiation
Secondary phase
Stress corrosion cracking
TEM

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10.1016/j.corsci.2025.112930

Cite this

@article{d614c4071f2547448aea9b2a4875be34,

title = "The role of secondary phases on SCC initiation of Alloy 718 in simulated PWR primary water",

abstract = "Stress corrosion cracking (SCC) initiation behavior of Alloy 718 with different precipitates was studied by slow strain rate tensile testing (SSRT) in a simulated pressurized water reactor (PWR) primary water environment. It was found that both nano-precipitates (γ', γ'' phases) and δ phases enhanced the SCC susceptibility. Nano-precipitates significantly suppressed the interior slip and increased the local stress concentration at grain boundaries (GBs), thus promoting the initiation of intergranular (IG) cracks. GBs oriented perpendicular to the loading direction favored IG crack propagation. Preferential oxidation of the δ phases and the δ/γ interface were precursors to crack initiation, thereby increasing the SCC susceptibility. The shape of δ phases affected the oxidation degree, and more severe oxidation was observed on needle-like δ phases.",

keywords = "AFM, Alloy 718, Crack initiation, Secondary phase, Stress corrosion cracking, TEM",

author = "Tianyu Zhu and Jiamei Wang and Miao Song and Quanyao Ren and Xi Qiu and Yuanming Li and Chuanbao Tang and Hongpu Yi and Jing Zhang and Wenxi Tian and Ang, \{Y. U.\} and Xianglong Guo",

note = "Publisher Copyright: {\textcopyright} 2025 Elsevier Ltd",

year = "2025",

month = aug,

day = "1",

doi = "10.1016/j.corsci.2025.112930",

language = "英语",

volume = "252",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - The role of secondary phases on SCC initiation of Alloy 718 in simulated PWR primary water

AU - Zhu, Tianyu

AU - Wang, Jiamei

AU - Song, Miao

AU - Ren, Quanyao

AU - Qiu, Xi

AU - Li, Yuanming

AU - Tang, Chuanbao

AU - Yi, Hongpu

AU - Zhang, Jing

AU - Tian, Wenxi

AU - Ang, Y. U.

AU - Guo, Xianglong

PY - 2025/8/1

Y1 - 2025/8/1

N2 - Stress corrosion cracking (SCC) initiation behavior of Alloy 718 with different precipitates was studied by slow strain rate tensile testing (SSRT) in a simulated pressurized water reactor (PWR) primary water environment. It was found that both nano-precipitates (γ', γ'' phases) and δ phases enhanced the SCC susceptibility. Nano-precipitates significantly suppressed the interior slip and increased the local stress concentration at grain boundaries (GBs), thus promoting the initiation of intergranular (IG) cracks. GBs oriented perpendicular to the loading direction favored IG crack propagation. Preferential oxidation of the δ phases and the δ/γ interface were precursors to crack initiation, thereby increasing the SCC susceptibility. The shape of δ phases affected the oxidation degree, and more severe oxidation was observed on needle-like δ phases.

AB - Stress corrosion cracking (SCC) initiation behavior of Alloy 718 with different precipitates was studied by slow strain rate tensile testing (SSRT) in a simulated pressurized water reactor (PWR) primary water environment. It was found that both nano-precipitates (γ', γ'' phases) and δ phases enhanced the SCC susceptibility. Nano-precipitates significantly suppressed the interior slip and increased the local stress concentration at grain boundaries (GBs), thus promoting the initiation of intergranular (IG) cracks. GBs oriented perpendicular to the loading direction favored IG crack propagation. Preferential oxidation of the δ phases and the δ/γ interface were precursors to crack initiation, thereby increasing the SCC susceptibility. The shape of δ phases affected the oxidation degree, and more severe oxidation was observed on needle-like δ phases.

KW - AFM

KW - Alloy 718

KW - Crack initiation

KW - Secondary phase

KW - Stress corrosion cracking

KW - TEM

UR - https://www.scopus.com/pages/publications/105003970255

U2 - 10.1016/j.corsci.2025.112930

DO - 10.1016/j.corsci.2025.112930

M3 - 文章

AN - SCOPUS:105003970255

SN - 0010-938X

VL - 252

JO - Corrosion Science

JF - Corrosion Science

M1 - 112930

ER -

The role of secondary phases on SCC initiation of Alloy 718 in simulated PWR primary water

Abstract

Keywords

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