Investigation of the fatigue crack growth behavior of S355 steel weldments of motor hangers of high-speed trains

Mao, Liyong; Wang, Wen‐Jing; Liu, Zhiming; Miao, Sha; Zhang, Dayong

doi:10.1016/j.engfailanal.2022.106425

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…The increased YTS was accompanied by the persistent or increased low-temperature impact toughness in longitudinal and transverse directions (at −20-−60 • C). Moreover, TMCP/AC decreased the rolling anisotropy, which was vital for large welded structures experiencing fatigue issues [69,70].…”

Section: Variation Of the Ductile-brittle Transition Temperature Depe...mentioning

confidence: 99%

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Zurnadzhy,

Stavrovskaia,

Chabak

et al. 2024

Materials

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Structural rolled steels are the primary products of modern ferrous metallurgy. Consequently, enhancing the mechanical properties of rolled steel using energy-saving processing routes without furnace heating for additional heat treatment is advisable. This study compared the effect on the mechanical properties of structural steel for different processing routes, like conventional hot rolling, normalizing rolling, thermo-mechanically controlled processing (TMCP), and TMCP with accelerating cooling (AC) to 550 °C or 460 °C. The material studied was a 20 mm-thick sheet of S355N grade (EN 10025) made of low-carbon (V+Nb+Al)-micro-alloyed steel. The research methodology included standard mechanical testing and microstructure characterization using optical microscopy, scanning and transmission electronic microscopies, energy dispersive X-ray spectrometry, and X-ray diffraction. It was found that using different processing routes could increase the mechanical properties of the steel sheets from S355N to S550QL1 grade without additional heat treatment costs. TMCP followed by AC to 550 °C ensured the best combination of strength and cold-temperature resistance due to formation of a quasi-polygonal/acicular ferrite structure with minor fractions of dispersed pearlite and martensite/austenite islands. The contribution of different structural factors to the yield tensile strength and ductile–brittle transition temperature of steel was analyzed using theoretical calculations. The calculated results complied well with the experimental data. The effectiveness of the cost-saving processing routes which may bring definite economic benefits is concluded.

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Section: Variation Of the Ductile-brittle Transition Temperature Depe...mentioning

confidence: 99%

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Zurnadzhy,

Stavrovskaia,

Chabak

et al. 2024

Materials

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“…3 Therefore, the mechanical properties of the bogie material (as a key loadsupporting component) and its welds are directly related to the security and reliability of high-speed trains. 4 Due to the yield strength being temperature sensitive, bodycentered cubic (bcc) structural steels exhibit ductile to brittle transition at low temperature, leading to lowtemperature brittle fracture. 5 In addition, the strength of steel usually increases when the temperature declined.…”

Section: Introductionmentioning

confidence: 99%

“…High‐speed trains operate over a vast geographical area, with the temperature of most part of areas in China reaching as low as −53.3°C in winter, which may lead to brittle fracture damage of steel structures in cold regions 3 . Therefore, the mechanical properties of the bogie material (as a key load‐supporting component) and its welds are directly related to the security and reliability of high‐speed trains 4 . Due to the yield strength being temperature sensitive, body‐centered cubic (bcc) structural steels exhibit ductile to brittle transition at low temperature, leading to low‐temperature brittle fracture 5 .…”

Section: Introductionmentioning

confidence: 99%

Fracture behavior of S355J2W steel and weld at low temperature

Li,

Liu,

et al. 2023

Fatigue Fract Eng Mat Struct

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The weather‐resistant steel S355J2W shows potential for use in the bogies of high‐speed trains operating in extremely cold regions. In this study, the mechanical properties and fracture behavior of S355J2W steel and its MAG welding joints were investigated using low‐temperature uniaxial tensile tests, Charpy impact tests, and three‐point bending tests (TPB), which play an important role in the safety and reliability of train operation. The ductility and toughness indices decreased as the temperature decreased from room temperature to −114°C, and the weld is more dangerous and prone to fracture than the base material area. The бs/бb values of WM and HAZ samples slightly increased by 3.7% and 3.8% from 20 to −114°C, respectively. And the ductile–brittle transition temperature (DBTT) of BM, WM, and HAZ were −75.6, −46.1, and −56.6°C, respectively. The fracture micro‐mechanisms were evaluated by analyzing the grain misorientation along the residual cracks using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The high‐angle grain boundaries (GBs) in the base metal were observed to greatly contribute to stopping or deflecting the crack propagation, thereby improving the low‐temperature toughness. In contrast, the cracks easily penetrate the low‐angle GBs of the weld (which made up 38% of the grain boundaries of the welds), thereby decreasing the lower temperature fracture toughness of the weld. The dislocations of S355J2W steel and the weld metal were investigated by TEM analysis.

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“…Researchers have also conducted systematic studies on the welding of S355 steel. On S355 steel weld fatigue crack extension, Mao et al [8] investigated the S355 steel weldment behavior of fatigue cracks in the welded details of motor hangers through crack growth numerical simulation under constant amplitude loading. Dariusz et al [9] researched the rate of fatigue crack growth in fillet welds of S355 steel subjected to bending.…”

Section: Introductionmentioning

confidence: 99%

Jointing Achievement and Performance Evaluation of Bogie Crossmember Ring Joint Welded via Inertia Friction Welding

Qin,

Zhang,

Zhang

et al. 2023

Materials

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As a major load-bearing component of trains, the weld quality of the bogie beam is critical to the safety of railway operations. This study specifically investigates the inertia friction welding process of S355 bogie crosshead tubes, with the aim of improving the weld quality and achieving one-time formation of the crosshead tube and tube seat. The microstructural features and mechanical properties of S355 inertia-welded joints were also compared with the base metal. Research indicates that inertia friction welds have no visible defects, and that the microstructure of the welding seam (WS) consists of granular bainite, acicular ferrite and little pearlite. The thermo-mechanically affected zone (TMAZ) consists of granular bainite bands and ferrite + pearlite bands. The hot work strengthening mechanism of inertia friction welding results in a higher level of hardness for both WS and TMAZ. The tensile property of the welded joints can be compared to the base metal. The yield strength, tensile strength and elongation of the welded joints, respectively, reach 87.5%, 100% and 79.5% of S355. However, the impact toughness of the welds at room temperature is lower than that of the base material, particularly in the TMAZ zone. Conversely, in an environment with a temperature of −40 °C, WS’s impact toughness surpasses that of the parent material.

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Investigation of the fatigue crack growth behavior of S355 steel weldments of motor hangers of high-speed trains

Cited by 8 publications

References 32 publications

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Fracture behavior of S355J2W steel and weld at low temperature

Jointing Achievement and Performance Evaluation of Bogie Crossmember Ring Joint Welded via Inertia Friction Welding

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