Crack branching behavior and amorphous film formation mechanism during SCC expanding test for multi-layers weld metal of NiCrMoV steels

Chu, Tongjiao; Shao, Chendong; Wang, Yaqi; Ma, Ninshu; Lü, Feifei

doi:10.1016/j.matdes.2022.110520

Cited by 3 publications

(1 citation statement)

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“…As a result, cl ions destroy the passivation film more quickly and further reduce the rate of passivation film formation [30,31]. The aggressive Cl − ions invaded the grain in multi-directions promoted by dislocation motion, facilitating the main crack to bifurcate [32].…”

Section: Corrosion Environment Analysismentioning

confidence: 99%

Failure Analysis of the Crack and Leakage of a Crude Oil Pipeline under CO2-Steam Flooding

Song

et al. 2023

Processes

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This paper presents the failure analysis of the crack and leakage accident of a crude oil pipeline under CO2-steam flooding in the western oilfield of China. To analyze the failure behavior and cause, different testing, including nondestructive testing, chemical composition analysis, tensile property testing, metallographic analysis, and microanalysis of fracture and chloride stress corrosion cracking (SCC) testing, are applied in the present study. The obtained results showed that the pipeline under the insulation layer of high humidity, high oxygen content, and high Cl− environment occurred pit corrosion, and the stress concentration area at the bottom of the corrosion pit sprouted cracks. Besides, it is demonstrated that the cracks were much branched, mostly through the crystal, and the fracture showed brittle, which is consistent with the typical characteristics of chloride SCC. Meanwhile, the insufficient Ni content of the pipeline material promoted the process of chloride SCC, and the high-temperature working conditions also aggravated the rate of chloride SCC. In addition, efficient precautions were provided to avoid fracture.

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Section: Corrosion Environment Analysismentioning

confidence: 99%

Failure Analysis of the Crack and Leakage of a Crude Oil Pipeline under CO2-Steam Flooding

Song

et al. 2023

Processes

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Cracking mechanism of CA6NM hydro turbine steel in cavitation erosion

Wang,

Zhang

2025

Tribology International

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Substantial toughening by thick nanoscale amorphous intergranular films in nanocrystalline materials

Huang,

Qin,

Dai

et al. 2023

Journal of Applied Physics

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Amorphous intergranular films (AIFs) have been proven in experiments to improve the damage tolerance of nanocrystalline materials. However, a quantitative study is still lacking. Molecular dynamics simulations were performed here to investigate the effect of CuNb AIFs on the fracture toughness of nanocrystalline Nb. In order to clarify the role of AIFs, a bicrystal Nb model with one straight symmetrical tilt grain boundary and a mode-I crack in one of the grains was constructed, in which the AIF effect was introduced by replacing the normal grain boundary with a CuNb AIF. Then, AIF thickness-dependent tensile deformation of the bicrystal Nb samples was simulated. The work-of-fracture, which is defined as the released strain energy due to the newly generated unit area in the crack during stretching, was employed to quantify the fracture toughness of the bicrystal systems. The results show that the fracture toughness of the AIF sample can be tripled due to the blunted crack tip and the relieved stress concentration at the crack tip as compared to the AIF-free one that exhibits a brittle crack propagation behavior. Also, the thicker the AIFs, the more pronounced this reinforcing effect. More importantly, it is found that there exists a critical AIF width of 1.7 nm, below which the crack will eventually break through the AIF, and above which the crack failed to do this. It is revealed that the enhanced fracture toughness originated from the transformation of brittle crack propagation to abundant dislocation emission from AIFs.

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Crack branching behavior and amorphous film formation mechanism during SCC expanding test for multi-layers weld metal of NiCrMoV steels

Cited by 3 publications

References 50 publications

Failure Analysis of the Crack and Leakage of a Crude Oil Pipeline under CO2-Steam Flooding

Failure Analysis of the Crack and Leakage of a Crude Oil Pipeline under CO2-Steam Flooding

Cracking mechanism of CA6NM hydro turbine steel in cavitation erosion

Substantial toughening by thick nanoscale amorphous intergranular films in nanocrystalline materials

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