Fatigue strength and life assessment of L-PBF 316L stainless steel showing process and corrosion related defects

Merot, Pierre; Morel, Franck; Pessard, Etienne; Mayorga, Linamaría Gallegos; Buttin, Paul; Baffie, T.

doi:10.1016/j.engfracmech.2022.108883

Cited by 12 publications

(5 citation statements)

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“…The observed results are influenced by the combined effect of the material matrix's strength and the presence of inherent defects, which impact the damage process and the determination of fatigue resistance. Data reported by Merot et al are: tensile strength σ U = 642 MPa, Vickers hardness Hv = 225 Kgf/mm 2 , grain size d = 49 µm, and threshold for long cracks (load ratio R = −1) ∆K thR = 9.04 MPa m 1/2 [51]. Figure 7 illustrates the fatigue lives of all the tested specimens, with an indication of the type of defect leading to fracture [51,52].…”

Section: The Intrinsic Fatigue Limitmentioning

confidence: 94%

“…Co raises the likelihood that the material's intrinsic fatigue limit is linked to mic that surpass the microstructural size, d. For further examination of this ma [50] can also be analyzed. In order to illustrate the challenges associated with defining intrins sistance, the study conducted by Merot et al [51] will be examined. The rese tigated the fatigue behavior of a 316L steel produced using laser powder bed contained various populations of defects, including lack of fusion (LoF), (CP), and electric discharge machined hemispherical defects (EDM).…”

Section: The Intrinsic Fatigue Limitmentioning

confidence: 99%

“…In order to illustrate the challenges associated with defining intrinsic fatigue resistance, the study conducted by Merot et al [51] will be examined. The researchers investigated the fatigue behavior of a 316L steel produced using laser powder bed fusion, which contained various populations of defects, including lack of fusion (LoF), corrosion pits (CP), and electric discharge machined hemispherical defects (EDM).…”

Section: The Intrinsic Fatigue Limitmentioning

confidence: 99%

“…Data reported by Merot et al are: tensile strength σ U = 642 MPa, Vickers hardness Hv = 225 Kgf/mm 2 , grain size d = 49 µm, and threshold for long cracks (load ratio R = −1) ∆K thR = 9.04 MPa m 1/2 [51]. Figure 7 illustrates the fatigue lives of all the tested specimens, with an indication of the type of defect leading to fracture [51,52]. It is important to note that the fatigue life reported by Merot et al for failure initiated within the matrix (without involvement of defects) does not exceed 5 × 10 5 cycles.…”

Section: The Intrinsic Fatigue Limitmentioning

confidence: 99%

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Intrinsic Fatigue Limit and the Minimum Fatigue Crack Growth Threshold

Chapetti,

Gubeljak,

Kozak

2023

Materials

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In the field of long-life fatigue, predicting fatigue lives and limits for mechanical components is crucial for ensuring reliability and safety. Fracture mechanics tools have enabled the estimation of fatigue lives for components with small cracks or defects. However, when dealing with defects larger than the microstructural characteristic size, estimating the fatigue resistance of a material requires determining the cyclic resistance curve for the defect-free matrix, which depends on knowledge of the material’s intrinsic fatigue limit. This study focuses on the experimental evidence regarding the intrinsic fatigue limit and its correlation with naturally nucleated non-propagating cracks. Fracture mechanics models for small crack propagation are introduced, and their disparities and limitations are analyzed. The concept of intrinsic fatigue limit is then introduced and applied to reanalyze a recent publication. Methods for estimating the intrinsic fatigue limit are explored and applied to experimental results reported in the literature. The need to clarify and accurately predict the intrinsic fatigue limit is highlighted in alloys where the processing generates defects larger than the microstructural size of the matrix, as often observed in materials and components produced using additive manufacturing.

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Section: The Intrinsic Fatigue Limitmentioning

confidence: 94%

Section: The Intrinsic Fatigue Limitmentioning

confidence: 99%

Section: The Intrinsic Fatigue Limitmentioning

confidence: 99%

Section: The Intrinsic Fatigue Limitmentioning

confidence: 99%

See 2 more Smart Citations

Intrinsic Fatigue Limit and the Minimum Fatigue Crack Growth Threshold

Chapetti,

Gubeljak,

Kozak

2023

Materials

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“…Such cases include pressure and temperature rise, working environment, material characteristics, element thickness, quantity, dimensions, arrangement of defects, etc. Of particular interest in terms of strength assessment are defects of "mechanical origin" such as scratches and risks [1][2][3][4][5]. Since any device undergoes repair or reconstruction during its service life, mechanical damage from the locksmith tool and other repair devices remains inevitably in the repair places and surfaces adjacent to these places.…”

Section: Introductionmentioning

confidence: 99%

Strength analysis of flat manhole cover in case of change of location and inclination angle of two mutually intersecting scratches

Rubtsov,

Kulakov,

Gracheva

et al. 2023

J. Phys.: Conf. Ser.

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Mechanical damages of the main structural elements of the process equipment of hazardous production facilities are quite often detected during the revision process after repairs when assessing the quality of the work performed. One of the most common mechanical damages on the surface of parts and assemblies of technical devices includes scratches and risks. Significant scratches and risks that have a relatively large area and depth and limit the commissioning of the facility are subject to sampling and removal during re-repair. Superficial and non-extended scratches and risks do not belong to unacceptable defects, the technical device should not be taken into account, and further operation occurs with their presence. During further operation of the facility, such defects may not manifest themselves in any way, but may be high-voltage concentrators, which in the vast majority of cases are not critical. However, the presence of two or more scratches on the surface of the structural elements, their different location relative to each other, and therefore different mutual influence, can have a significant effect on the redistribution of zones and values of increased stresses on the surfaces where they are located. In the current regulatory and technical documents for diagnostics, these points are not considered, and accordingly are not taken into account. Therefore, the actual work is to perform a strength analysis of a flat manhole cover with two scratches, which have a different location on the surface, and a different angle of intersection relative to each other.

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