Effect of welding processes on the fatigue behaviour of ultra-high strength steel butt-welded joints

Steimbreger, Ceferino; Gubeljak, Nenad; Vuherer, Tomaž; Enzinger, Norbert; Ernst, Wolfgang; Chapetti, Mirco Daniel

doi:10.1016/j.engfracmech.2022.108845

Cited by 9 publications

(3 citation statements)

References 44 publications

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“…where g a W indicates the shape factor of the standard specimen. The formula for calculating the shape factor of the C(T) samples is as follows [37]:…”

Section: Effect Of Low Temperature On Fatigue Crack Propagation Behaviormentioning

confidence: 99%

“…Equation ( 3) is an equation used to calculate the range of stress intensity factors (∆K), where a = a/W represents the ratio of the crack size to the specimen width, ∆P represents the range of the applied fatigue cyclic load, B represents the thickness of the specimen, and W represents the width of the specimen. Finally, for the da/dN − ∆K curve, linear fitting is performed based on the Paris law in a logarithmic coordinate system [37]. The purpose of this equation is to calculate the relationship between the range of stress intensity factors and the crack size, specimen geometry, and applied load.…”

Section: Effect Of Low Temperature On Fatigue Crack Propagation Behaviormentioning

confidence: 99%

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Experimental Study on the Fatigue Crack Propagation Rate of 925A Steel for a Ship Rudder System

Yu,

Guo,

Cao

et al. 2024

Materials

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The low-temperature fatigue crack propagation rate of 925A steel, as a rudder steel for polar special ships, has a crucial impact on the evaluation of the fatigue strength of polar ships. The purpose of this article is to study the fatigue crack propagation rate of 925A steel under different low-temperature conditions from room temperature (RT) to −60 °C. The material was subjected to fatigue crack propagation tests and stress intensity factor tests. The experimental tests were conducted according to the Chinese Standard of GB/T6398-2017. The results show that as the temperature decreases, the lifespan of 925A increases. Within a certain stress intensity factor, as the temperature decreases, the fatigue crack propagation rate decreases. At −60 °C, it exhibits ductile fracture; within normal polar temperatures, it can be determined that 925A meets the requirements for low-temperature fatigue crack propagation rates in polar regions. However, in some extreme polar temperatures below −60 °C, preventing brittle failure becomes a key focus of fatigue design. Finally, the fatigue crack propagation behavior at the microscale of 925A steel at low temperatures was described using fracture morphology. The experimental data can provide reference for the design of polar ships to further resist low-temperature fatigue and cold brittle fracture.

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“…where g a W indicates the shape factor of the standard specimen. The formula for calculating the shape factor of the C(T) samples is as follows [37]:…”

Section: Effect Of Low Temperature On Fatigue Crack Propagation Behaviormentioning

confidence: 99%

Section: Effect Of Low Temperature On Fatigue Crack Propagation Behaviormentioning

confidence: 99%

Experimental Study on the Fatigue Crack Propagation Rate of 925A Steel for a Ship Rudder System

Yu,

Guo,

Cao

et al. 2024

Materials

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“…The fatigue resistance of EB-welded joints is influenced by multiple factors, including process defects, [20] residual stresses, [21] and the existence of nonuniform microstructure [22][23][24] throughout the welded joint. However, no evident process defects were detected in the crack initiation area (Figure 10a), and the postweld heat treatment was utilized to relieve residual stress.…”

Section: Comparing Fatigue Properties Of Eb-welded Joints With Bmmentioning

confidence: 99%

Influence of Nonuniform Microstructure on High‐Cycle Fatigue Properties of the Electron‐Beam‐Welded Joint of High‐Strength Steel

Wan

et al. 2023

steel research int.

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The relatively weak fatigue property of electron beam (EB)‐welded joints is one of the key issues restricting their wide application. Herein, the impact of accelerating voltage, specifically the process‐induced nonuniform microstructure, is investigated on the high‐cycle fatigue properties of 15CrMnMoVA steel EB‐welded joints. It is indicated in the results that increasing the accelerating voltage from 120 to 150 kV (150‐specimen) results in a longer fatigue life and an 11.8% improvement in fatigue limit for the welded joint with the locking bottom structure. However, even after removing the locking bottom structure, the fatigue life of the 150‐specimen is still inferior to that of the base metal. The shorter fatigue life is primarily due to stress concentration and premature fatigue failure caused by the nonuniform distribution of grain size and crystallographic orientation across the EB‐welded joint. Thus, further optimization of the welding process is necessary to improve the fatigue reliability of EB‐welded joints by obtaining a more uniform microstructure.

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Fatigue life assessment of Q345 steel fillet welded joints with competitive failure modes

Weng,

Meng,

Deng

et al. 2024

Engineering Fracture Mechanics

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Effect of welding processes on the fatigue behaviour of ultra-high strength steel butt-welded joints

Cited by 9 publications

References 44 publications

Experimental Study on the Fatigue Crack Propagation Rate of 925A Steel for a Ship Rudder System

Experimental Study on the Fatigue Crack Propagation Rate of 925A Steel for a Ship Rudder System

Influence of Nonuniform Microstructure on High‐Cycle Fatigue Properties of the Electron‐Beam‐Welded Joint of High‐Strength Steel

Fatigue life assessment of Q345 steel fillet welded joints with competitive failure modes

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