Cracking behavior of thermally aged and irradiated CF-8 cast austenitic stainless steel

Chen, Y.; Alexandreanu, B.; Chen, W.-Y.; Natesan, K.; Li, Z.; Yang, Yong; Rao, A. S.

doi:10.1016/j.jnucmat.2015.08.047

Cited by 23 publications

(4 citation statements)

References 19 publications

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“…Cast duplex stainless steel (CDSS), widely used in pressure water reactors (PWRs) as the primary circuit piping and the reactor coolant pump casing, is sensitive to thermal aging embrittlement after long-term service [1][2][3][4][5][6]. This embrittlement causes a degradation in the mechanical properties of CDSS, such as impact toughness, tensile properties, and fatigue properties [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

In Situ Observation of the Deformation and Fracture Behaviors of Long-Term Thermally Aged Cast Duplex Stainless Steels

Wang

2019

Metals

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Cast duplex stainless steel (CDSS) components suffer embrittlement after long-term thermal aging. The deformation and fracture behaviors of un-aged and thermally aged (at 400 °C for 20,000 h) CDSS were investigated using in situ scanning electron microscopy (SEM). The tensile strength of CDSS had a small increase, and the tensile fracture changed from ductile to brittle after thermal aging. Observations using in situ SEM indicated that the initial cracks appeared in the ferrite perpendicular to the loading direction after the macroscopic stress exceeded a critical value. The premature fracture of ferrite grains caused stress on the phase boundaries, leading the cracks to grow into austenite. The cleavage fracture of ferrite accelerated the shearing of austenite and reduced the plasticity of the thermally aged CDSS.

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Section: Introductionmentioning

confidence: 99%

In Situ Observation of the Deformation and Fracture Behaviors of Long-Term Thermally Aged Cast Duplex Stainless Steels

Wang

2019

Metals

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“…In addition, the SCC susceptibility is related with the content of δ-ferrite. Abundant δ-ferrite phase can decrease the SCC susceptibility effectively [18]. The stress corrosion crack can be retarded by the δ/γ interface, which results in high corrosion cracking resistance [19].…”

Section: Microstructurementioning

confidence: 99%

Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW

Wang

Chai

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The stress corrosion cracking (SCC) behaviour of AISI 304 pipe girth welds which were welded by a single-pass laser beam welding (LBW) and a multi-pass tungsten inert gas welding (TIG), respectively, was studied by the slow strain rate tests combined with the electrochemical corrosion tests. The results show that fracture of both the TIG joint and LBW joint occurs in the heat-affected zone (HAZ). According to the electron-backscattered diffraction observation of the microstructures, comparison of potentiodynamic polarization curves and X-ray photoelectron spectroscopy analysis of corrosion products on HAZs of the two joints after the electrochemical tests, the LBW joint exhibits better SCC resistance than the TIG joint in corrosion environments, due to the synthetic effect of more Cr 2 O 3 in corrosion products, finer grains, lower residual strain and higher δ-ferrite content in its HAZ. Although the TIG joint has better mechanical property, considering lower SCC susceptibility and higher production efficiency of the LBW joint, the LBW promisingly replaces the TIG for welding of AISI 304 pipes in the nuclear power industry.

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“…Z3CN20.09M duplex stainless steel (DSS) is used in primary coolant pipes of pressurized water reactors (PWR), which consisted of ∼15 vol% ferrite and ∼85 vol% austenite phases . Thermal aging often occurred in the DSS due to the precipitation of Cr‐rich α′ phase and G phase in the ferrite phase when the steel is served at temperature between 200 °C and 550 °C for a long time, deteriorating not only the mechanical but also corrosion properties of the DSS .…”

Section: Introductionmentioning

confidence: 99%

Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

You

Chen

Yang

2018

Materials & Corrosion

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The protectiveness and characterization of the passive film formed on Z3CN20.09M duplex stainless steel aged for different times were investigated by using electrochemical measurements and surface analysis method. The thermal aging causes the spinodal decomposition of the ferrite phase in the steel, resulting in the decrease of localized corrosion resistance. The increased aging time causes a thicker, dispersive, and lower resistance passive film formed on the surface of the steel based on EIS and Mott–Schottky (MS) analysis. The Auger electron spectroscopy (AES) and X‐ray photoelectron spectroscopy (XPS) results indicate that Cr is enriched in the inner layer of the passive films with a reduced content, decreasing the compactness and homogeneity of the passive films.

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Cracking behavior of thermally aged and irradiated CF-8 cast austenitic stainless steel

Abstract: 2016-11-02T18:49:00

Cited by 23 publications

References 19 publications

In Situ Observation of the Deformation and Fracture Behaviors of Long-Term Thermally Aged Cast Duplex Stainless Steels

In Situ Observation of the Deformation and Fracture Behaviors of Long-Term Thermally Aged Cast Duplex Stainless Steels

Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW

Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

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