Fatigue crack growth of EH36 steel in air and corrosive marine environments

Zhang, Ying; Shao, Yongbo; Gao, Xudong; Luo, Xiafei; Zhu, Hongmei

doi:10.1016/j.jcsr.2023.108104

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…This indirectly proves that frequency has an impact on fatigue life [32][33][34]. In addition, the frequency will affect the crack growth rate, and the corrosion at the crack tip will accelerate the crack initiation and growth on the surface of the sucker rod, indicating the correlation between the corrosion fatigue results and the frequency [35,36]. The current research has not fully considered the coupling effect of well fluid corrosion and alternating stress on the sucker rod during production, and there is a certain gap between the selection of corrosion medium and loading frequency and the actual working condition of sucker rods.…”

Section: Introductionmentioning

confidence: 95%

Low-Frequency Corrosion Fatigue Test Study of Sucker Rods under High-Salinity Well Fluids in Deep CBM Wells

Zhang,

Jing,

et al. 2023

Processes

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Corrosion fatigue test is the most direct and effective method to study the corrosion fatigue characteristics of sucker rod. At present, the commonly used test method is the high frequency fatigue test, but the working state of sucker rod is typical low-frequency and high-cycle corrosion fatigue, and the test with high frequency will reduce the impact of corrosion. Alloy steel 4330 is widely used in coalbed gas well high strength sucker rod, but the research on its low frequency corrosion fatigue life is relatively few. Therefore, in this paper, the corrosion fatigue test method of axial low-frequency and high-cycle was adopted to study the corrosion fatigue characteristics of 4330 steel sucker rod through the corrosion fatigue test under different typical corrosion media, temperature, and stress levels. The results show that the fatigue life of 4330 sucker rod drops sharply when the Cl− concentration in high salinity well fluid exceeds the threshold value of 155 mg/L. When this threshold is exceeded, the downward trend slows down. It can be seen that the significant factor affecting the corrosion fatigue life of 4330 material is not the concentration of Cl−, but the existence of Cl−. The presence of HCO3− promotes a further decrease in the corrosion fatigue life of the 4330 sucker rod by Cl−. The corrosion fatigue life of 4330 sucker rod decreases with the increase of temperature. When the well fluid temperature is less than 50 °C, the impact is relatively significant. When the well fluid temperature is more than 70 °C, the decline trend of corrosion fatigue life slows down. Based on the fitted S-N curve (stress-fatigue life curve), it is calculated that the fatigue limit of 4330 sucker rod at the stress ratio of 0.6 is 196 MPa in the solution of 10,000 mg/L Cl− at room temperature. These could provide valuable theoretical and technical guidance for design and selection of high-strength sucker rod in high-salinity corrosion well fluid environment.

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Section: Introductionmentioning

confidence: 95%

Low-Frequency Corrosion Fatigue Test Study of Sucker Rods under High-Salinity Well Fluids in Deep CBM Wells

Zhang,

Jing,

et al. 2023

Processes

View full text Add to dashboard Cite

show abstract

“…However, under stable crack growth, the Paris equation can become a valuable tool for predicting fatigue crack growth rate (FCGR) even in corrosive environments [53,180,181]. The relationship between temperature humidity and its effect on fracture toughness, FCGR, and fatigue life estimation has yet to be fully understood.…”

Section: Modelling and Predictive Approachesmentioning

confidence: 99%

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Alqahtani,

Starr,

Khan

2024

Metals

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Aluminium alloys have been integral to numerous engineering applications due to their favourable strength, weight, and corrosion resistance combination. However, the performance of these alloys in coastal environments is a critical concern, as the interplay between fracture toughness and fatigue crack growth rate under such conditions remains relatively unexplored. This comprehensive review addresses this research gap by analysing the intricate relationship between fatigue crack propagation, fracture toughness, and challenging coastal environmental conditions. In view of the increasing utilisation of aluminium alloys in coastal infrastructure and maritime industries, understanding their behaviour under the joint influences of cyclic loading and corrosive coastal atmospheres is imperative. The primary objective of this review is to synthesise the existing knowledge on the subject, identify research gaps, and propose directions for future investigations. The methodology involves an in-depth examination of peer-reviewed literature and experimental studies. The mechanisms driving fatigue crack initiation and propagation in aluminium alloys exposed to saltwater, humidity, and temperature variations are elucidated. Additionally, this review critically evaluates the impact of coastal conditions on fracture toughness, shedding light on the vulnerability of aluminium alloys to sudden fractures in such environments. The variability of fatigue crack growth rates and fracture toughness values across different aluminium alloy compositions and environmental exposures was discussed. Corrosion–fatigue interactions emerge as a key contributor to accelerated crack propagation, underscoring the need for comprehensive mitigation strategies. This review paper highlights the pressing need to understand the behaviour of aluminium alloys under coastal conditions comprehensively. By revealing the existing research gaps and presenting an integrated overview of the intricate mechanisms at play, this study aims to guide further research and engineering efforts towards enhancing the durability and safety of aluminium alloy components in coastal environments.

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Two types of η phase synergistically improving the mechanical properties of LDED CoCrFeNiTi high-entropy alloy

Zhang,

Mu,

Cai

2024

J Mater Sci

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Fatigue crack growth of EH36 steel in air and corrosive marine environments

Cited by 8 publications

References 41 publications

Low-Frequency Corrosion Fatigue Test Study of Sucker Rods under High-Salinity Well Fluids in Deep CBM Wells

Low-Frequency Corrosion Fatigue Test Study of Sucker Rods under High-Salinity Well Fluids in Deep CBM Wells

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Two types of η phase synergistically improving the mechanical properties of LDED CoCrFeNiTi high-entropy alloy

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