Corrosion fatigue crack initiation and initial propagation mechanism of E690 steel in simulated seawater

Zhao, Tianliang; Liu, Zhiyong; Du, Cuiwei; Dai, Cuixia; Li, Yong; Zhang, Bowei

doi:10.1016/j.msea.2017.09.078

Cited by 115 publications

(42 citation statements)

References 22 publications

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“…In the crack formation process, microcracks will initiate from corrosion pits and propagate along grain boundaries when corrosion pits reach a certain size . Crack propagation is no longer affected by the electrochemical corrosion reactions in corrosion pits and is transformed into transgranular crack propagation when microcracks reach a critical crack length.…”

Section: Resultsmentioning

confidence: 99%

“…Field practice shows that although the working stress of a drill pipe is lower than the fatigue limit, the problem of drill pipe fracture remains serious and the fatigue strength of drill pipe steel measured in air cannot provide the basis for actual working conditions. Local and foreign researchers have investigated the fatigue behavior of drill pipe steel . However, all previous studies have focused on the fatigue behavior of drill pipe steel in air or after pre‐corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion fatigue behavior of S135 high‐strength drill pipe steel in a simulated marine environment

Luo

Liu

Lin

2018

Materials & Corrosion

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The fatigue and corrosion fatigue lives of S135 drill pipe steel were tested in air and in a simulated marine environment. The empirical equations for fatigue lives in different environments were obtained via regression analysis, and fatigue fracture mechanisms were elucidated. Results showed that an endurance limit existed in air, and fatigue cracks were initiated from or near the surface of specimens. The morphologies in air were cleavage fracture at the crack initiation zone and fatigue striations at the crack propagation zone. In the marine environment, fatigue striations were less at higher stress amplitudes, and fatigue lives were lower than that in air. Fatigue cracks were initiated from the corrosion pits on and near the surface of specimens. The morphologies were characteristic cleavage fracture at the crack initiation zone and cleavage fracture and secondary cracking at the crack propagation zone. Less fatigue striations occurred on the main fracture surface. The fracture mechanism in the marine environment can be summarized as follows: corrosion pit formation, crack initiation, crack propagation, piercing, and fracture.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion fatigue behavior of S135 high‐strength drill pipe steel in a simulated marine environment

Luo

Liu

Lin

2018

Materials & Corrosion

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“…Xu and Qiu found that the observed fatigue cracks always initiate from pits for Q235 low‐alloy steel with prior immersion in saturated NaCl solution, and in many cases, the interaction of several pits is the most potent initiator. Similarly, Zhao et al conducted the cyclic loading of low‐alloy high‐strength E460 steel with a maximum stress close to or greater than the proof stress in simulated seawater. Plastic deformation was observed in some local areas, which caused the appearance of corrosion pits leading to the cracks initiation.…”

Section: Introductionmentioning

confidence: 99%

“…Three‐parameter fitting S ‐ N curves could show the fatigue limit of the metal materials. However, the two‐parameter fitting S ‐ N curves always shows that there is no fatigue limit …”

Section: Introductionmentioning

confidence: 99%

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Han

Wang

2019

Fatigue Fract Eng Mat Struct

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Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel are investigated in simulated seawater. Fractography is performed by using scanning electron microscopy (SEM). The macroscale fracture surface and microstructure of the failed specimen are acquired including the crack initiation, crack propagation, and pitting evolution. The maximum cyclic stress (S) versus number of cycles to failure (N) curves is derived by three‐parameter fatigue curve method. Fatigue life is predominantly controlled by the corrosion pitting‐induced crack initiation when tested in simulated seawater at lower stress levels. As the maximum cyclic stress is less than 185 MPa, the chloride ion erosion is the main influence factor, which affects the fatigue failure of the G20Mn5QT cast steel in simulated seawater.

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“…Immersion corrosion is one of the most serious failures in the marine environment [4]. In the absence of effective corrosion protection measures, the offshore platform will suffer from severe corrosion in a few years, and the corrosion loss will surpass the damage caused by other natural disasters.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Remelting Power on Immersion Corrosion of Amorphous Al–Ti–Ni Coatings

Chen

Dejun

2018

Coatings

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An arc-sprayed amorphous Al-Ti-Ni coating on S355 structural steel was processed by laser remelting (LR) at powers of 600, 800, and 1000 W. The surface-cross-sectional morphologies, chemical element distributions, and phase compositions of the as-obtained Al-Ti-Ni coatings were analyzed using a scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), and X-ray diffractometer (XRD), respectively. The immersion corrosion tests of Al-Ti-Ni coatings in 3.5% NaCl solution for 720 h were performed to investigate the effects of LR power on their immersion corrosion behaviors. The test results show that the amorphous Al-Ti-Ni coatings form good metallurgical bonding with the substrate after LR. The AlNi, Al 3 Ti, Al 3 Ni 2 , Ti 3 O 5 , and Al 2 O 3 amorphous phases are detected in the Al-Ti-Ni coatings after LR. The corrosion potentials of Al-Ti-Ni coatings after LR show a positive shift relative to that of S355 steel, implying that the corrosion resistance of Al-Ti-Ni coatings was superior to that of S355 steel. A dense protective Al 2 O 3 film is formed on the Al-Ti-Ni coating surface at an LR power of 1000 W, at which power the highest corrosion potential of −0.233 V is observed. The corrosion mechanisms of Al-Ti-Ni coating at the LR power of 1000 W are uniform corrosion and pitting corrosion, while those of Al-Ti-Ni coatings at the LR powers of 600 and 800 W are localized corrosion and pitting corrosion. The corrosion resistance of Al-Ti-Ni coating with the LR power of 1000 W is better than those at the LR powers of 600 and 800 W, effectively improving the corrosion resistance of S355 steel.

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Corrosion fatigue crack initiation and initial propagation mechanism of E690 steel in simulated seawater

Cited by 115 publications

References 22 publications

Corrosion fatigue behavior of S135 high‐strength drill pipe steel in a simulated marine environment

Corrosion fatigue behavior of S135 high‐strength drill pipe steel in a simulated marine environment

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Effect of Laser Remelting Power on Immersion Corrosion of Amorphous Al–Ti–Ni Coatings

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