Ratchetting-fatigue behavior of a 42CrMo steel under near-yield mean stress

Sui, Guoying; Wang, Zhenqiang; Fang, Xuming; Gao, Guhui; Zhao, Chengzhi; Guo, Yibin; Song, Yixing; Jiang, Fengchun

doi:10.1016/j.ijmecsci.2023.108166

Cited by 16 publications

(2 citation statements)

References 76 publications

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“…The well-clarified failure mechanism provides a certain physical basis for the theoretical model. At present, there is a comprehensive body of research on failure mechanisms under uniaxial loading conditions, with researchers delving deeply into its yield behavior, 41 fatigue fracture, [42][43][44] crack propagation mechanisms, 45 and microstructure and defects. The deformation and damage mechanism have not been well investigated for the Inconel 718 superalloy under multiaxial loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial creep–fatigue failure mechanism and life prediction of a turbine blade based on a unified numerical solution approach

Zhang,

Xu,

Wang

et al. 2024

Fatigue Fract Eng Mat Struct

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Exposure of turbine blades to cyclic torsional loading at high temperature, stemming from pre‐torque installation and the aerodynamic forces during operation, has the potential to induce substantial creep–fatigue damage, thereby contributing to the likelihood of premature failure. Investigating the deformation mechanisms and proposing a reliable life prediction method aiming at torsional loading is critical to ensure the structural integrity of turbine blades. This study conducted strain‐controlled fatigue and creep–fatigue tests on Inconel 718 superalloy, employing a multiaxial servo‐hydraulic testing machine. Electron backscattering diffraction elucidated deformation and damage mechanisms, forming a basis for subsequent constitutive modeling and life prediction. The lack of creep–fatigue mechanical behavior and microscopic failure mechanism when stress triaxiality equal to 0 is filled, which provides the theoretical basis and data support for the life design and damage assessment of this material under extreme service conditions. The unified viscoplasticity constitutive model effectively characterized macroscopic deformation under torsional loading. Prediction of creep–fatigue life under torsional loading, utilizing the multiaxial ductility factor‐modified strain energy density exhaustion model, demonstrated excellent alignment with experimental findings. Finally, parametric analyses of stress distribution and damage assessment under different conditions were carried out for the example of a turbine blade with relatively rarely considered aerodynamic loading as a variable. It is expected to be popularized and applied in life design and damage assessment of high‐temperature structures under multiaxial loading in engineering.

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Section: Introductionmentioning

confidence: 99%

Multiaxial creep–fatigue failure mechanism and life prediction of a turbine blade based on a unified numerical solution approach

Zhang,

Xu,

Wang

et al. 2024

Fatigue Fract Eng Mat Struct

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“…42CrMo-S steel is extensively utilized because of its superior hardenability, higher strength and toughness, excellent impact resistance and fatigue properties after tempering, and outstanding impulse toughness at low temperatures [1][2][3][4]. Currently, Cr-Mo series gear steels are mainly used in construction machinery, aviation generators [5][6][7], and some structural components (crankshafts, bearings, and bolts) [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study on the Evolution Law of Inclusions in the Whole Process and Evaluation of Cleanliness in Start and End of Casting Billets of 42CrMo-S Steel

et al. 2023

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To investigate the evolution law of inclusions in 42CrMo-S steel, this paper samples and analyzes the steel during its refining process as well as the head and tail billets. An oxygen and nitrogen analyzer, a scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectrometry (EDS), and an ASPEX automatic inclusion scanning electron microscope are employed to analyze the cleanliness level of the molten steel in the refining stage and the head and tail billets. The results demonstrate that the total oxygen content at the end of LF slagging is 10.2 ppm, indicating that the refining slag has an excellent deoxygenation effect. During the RH refining process, the total oxygen content of the molten steel diminishes to less than 10 ppm and reaches 6.3 ppm at end-RH. The nitrogen content in the molten steel gradually increases during the smelting process and attains 65 ppm at end-RH. Upon arrival at LF, pure Al2O3 plays the role of the primary inclusions in the molten steel. Afterwards, the pure Al2O3 inclusions transform into Mg-Al spinel-type inclusions, Al2O3-MgO-CaO inclusions, and Al2O3-CaO inclusions. The number of CaS-type inclusions in the steel reaches the maximum after feeding the S wire. In the RH refining stage, the percentage of inclusions with a size less than 5 μm is maintained above 90%. Finally, the cleanliness level of the head and tail billets (the start and end of a casting sequence) is analyzed, and it is recommended that the cut scrap length for the head billet is 0.3 m and the reasonable cutting scrap length for the tail billet is 1 m.

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Effects of Loading Frequency, Mean Stress and Stress Amplitude on Ratchetting-Fatigue Behavior in 42CrMo Steel Under Near-Yield Stress-Controlled Condition

Sui,

Wang,

Jiang

et al. 2023

Metall Mater Trans A

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Ratchetting-fatigue behavior of a 42CrMo steel under near-yield mean stress

Cited by 16 publications

References 76 publications

Multiaxial creep–fatigue failure mechanism and life prediction of a turbine blade based on a unified numerical solution approach

Multiaxial creep–fatigue failure mechanism and life prediction of a turbine blade based on a unified numerical solution approach

Study on the Evolution Law of Inclusions in the Whole Process and Evaluation of Cleanliness in Start and End of Casting Billets of 42CrMo-S Steel

Effects of Loading Frequency, Mean Stress and Stress Amplitude on Ratchetting-Fatigue Behavior in 42CrMo Steel Under Near-Yield Stress-Controlled Condition

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