Fatigue Damage Assessment of Alternator Fans by EBSD

Vogt, Jean‐Bernard; Bouquerel, Jérémie; Léaux, F.; Palleschi, Frédéric

doi:10.1016/j.proeng.2013.12.112

Cited by 16 publications

(3 citation statements)

References 7 publications

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“…This indicates that the dislocation density is getting higher at the higher strain amplitudes, which is consistent with the results of KAM and GND density as shown in Figure 4. In ferritic steel 34 , SS400 structural steel 2 , and ASS 4 , with the increase of strain amplitudes, the dislocations density in the specimens under cyclic loading tends to increase due to the progressive reduction of the dislocation cell size 35 .…”

Section: Dislocation Microstructures After Fatiguementioning

confidence: 99%

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Fang

Wei

et al. 2022

Mat. Res.

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In this paper, the relationship between Kernel average misorientation (KAM), geometrically necessary dislocation (GND) density and dislocation structures of Nb-bearing austenitic stainless steel under low cycle fatigue (LCF) was studied at 600°C at the total strain amplitude ranged from 0.3% to 1.0%. The results based on EBSD analysis show that the GND density in fatigue specimens gradually increases with the increase of strain amplitude. Under LCF loading, the dislocation structures are mainly planar slip bands (PSBs) and the cell structures. With the increase of strain amplitude, the number of PSBs increases with decrease in width, and the average diameter of cells also decreases. The PSBs originate due to the dynamic strain aging (DSA) effect, and DSA is more significant under high strain amplitude. The average diameter of cell structures has a specific relationship with GND density.

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Section: Dislocation Microstructures After Fatiguementioning

confidence: 99%

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Fang

Wei

et al. 2022

Mat. Res.

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“…In the present investigation, electron backscatter diffraction (EBSD) analysis is performed on different zones of the WJ to evaluate the accumulation of localized deformation and microstructural transformation, thereby estimating the extent of fatigue damage in each zone and its correlation with the change in fatigue lives under different testing conditions. The resistance of the material to fatigue damage generally showed a good correlation with the accumulated local plastic strain, which can be quantified effectively by measuring the change in the local microstructural features 31,45–49 . The temperature selected in the present study for IF (923 K) and TMF (673–923 K) cycling encompasses the regime of operation of oxidation, DSA, fatigue, and creep mechanisms in addition to microstructural transformations.…”

Section: Introductionmentioning

confidence: 98%

“…The resistance of the material to fatigue damage generally showed a good correlation with the accumulated local plastic strain, which can be quantified effectively by measuring the change in the local microstructural features. 31,[45][46][47][48][49] The temperature selected in the present study for IF (923 K) and TMF (673-923 K) cycling encompasses the regime of operation of oxidation, DSA, fatigue, and creep mechanisms in addition to microstructural transformations. An insight into the microstructural changes in the weld region, and its combined effect with time-dependent mechanisms to crack initiation and subsequent propagation under the above tests is of great importance, warranting closer examination.…”

Section: Introductionmentioning

confidence: 99%

New insights into thermomechanical fatigue behavior of AISI Type 316 LN SS weld joint

Telagathoti

Nagesha

Ramamurthy

2021

Fatigue Fract Eng Mat Struct

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Cyclic deformation and fracture behavior of a type 316 LN austenitic stainless steel (SS) weld joint (WJ) were investigated under thermomechanical fatigue (TMF) and isothermal low cycle fatigue (IF) cycling at the maximum temperature (Tmax) of TMF. A higher cyclic stress response (CSR) and reduced cyclic softening were observed under TMF compared with IF tests. In‐phase (IP) TMF resulted in lower lives compared with IF cycling at the Tmax and out‐of‐phase (OP) TMF, which was attributed to the more pronounced creep‐induced intergranular damage. Characterization of microstructural features and microhardness variations revealed that the accumulation of damage and associated failure depends on the strength and microstructural gradient, together with the deformation incompatibility. The crack propagation is found to depend on the individual and synergistic interactions of the microstructural transformations, creep, and oxidation, depending on the type of fatigue cycle (IF and IP/OP TMF), strain amplitude, and thermal cycling effects.

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Machine-Learning-Assisted Development of Carbon Steel With Superior Strength and Ductility Manufactured by Electron Beam Powder Bed Fusion

Gui,

Aoyagi,

Bian

et al. 2023

Metall Mater Trans A

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In this study, based on a novel support vector machine optimization method, a wide processing window for manufacturing defect-free S25C carbon steel by electron beam powder bed fusion (EB-PBF) was identified. Samples with same energy densities exhibited similar microstructures and mechanical properties. One sample showed an optimum strength and elongation combination of 459.3 MPa and 57.6 pct. The pearlite region with irregular cementite particles was the first to crack during deformation, and the cracks gradually expanded into the surrounding area. Ferrite, cellular structures, and pearlite with parallel and straight cementite particles could effectively modulate the deformation by slip and enhance the plasticity of the S25C parts. After quenching, the strength improved to an unprecedented value of 1722.5 MPa owing to the presence of martensite and dislocation entanglements, with an elongation of 16.8 pct. The strength decreased after further tempering, and the plasticity evidently increased, with an optimum strength and elongation combination of 722.7 MPa and 44.2 pct, respectively. The microstructure of tempered sample contained lath martensite, cementite particles, and sparse dislocation lines. These results demonstrate that the current method can serve as a powerful tool for effectively optimizing the high-dimensional parameters of the EB-PBF process to produce carbon steel with excellent mechanical properties.

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Fatigue Damage Assessment of Alternator Fans by EBSD

Cited by 16 publications

References 7 publications

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

New insights into thermomechanical fatigue behavior of AISI Type 316 LN SS weld joint

Machine-Learning-Assisted Development of Carbon Steel With Superior Strength and Ductility Manufactured by Electron Beam Powder Bed Fusion

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