Low cycle fatigue of additively manufactured thin-walled stainless steel 316L

Yu, Cheng-Han; Leicht, Alexander; Peng, Ru Lin; Moverare, Johan

doi:10.1016/j.msea.2021.141598

Cited by 27 publications

(10 citation statements)

References 49 publications

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“…The L-PBF steel presents a softening behavior after a brief moderate hardening, whereas the wrought steel exhibits also a secondary hardening stage that is not as moderate as the hardening in the first cycles. The same differences in experimental behaviors are also highlighted in Yu et al 19 As reported by the authors, from a microstructural perspective, the secondary hardening seems related to the austenitemartensite transformation caused by an intensive mechanical strain. This possible explanation was already suggested in the past.…”

Section: Cyclic Stress Responsesupporting

confidence: 73%

“…In fact, only a few, and often incomparable results, can be found in the literature for this additively manufactured material. For instance, fundamental studies of the LCF performance of L‐PBF AISI 316L can be found concerning the influence of: the following thermal treatment, 17,18 specimen geometry, 19 microstructure, 20 coating, 21 layer orientation, surface roughness, 22 process parameters, 23 and high strain ranges 24 . Other further studies focused their attention on the deformation mechanisms involved during cyclic loading to reveal the role of the cell structure, which distinguishes the as‐built microstructure of some AM alloys, on the LCF strength 25 .…”

Section: Introductionmentioning

confidence: 99%

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Strain‐controlled fatigue loading of an additively manufactured AISI 316L steel: Cyclic plasticity model and strain–life curve with a comparison to the wrought material

Pelegatti

Benasciutti

Bona

et al. 2023

Fatigue Fract Eng Mat Struct

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Low cycle fatigue (LCF) regime was experimentally studied for a 316L steel additively manufactured by laser‐powder bed fusion (L‐PBF), a material widely used in sectors that require a reliable durability analysis. Material cyclic elastoplastic behavior is described by the Chaboche–Voce combined plasticity model, which displayed a great degree of accuracy. The fatigue life was modeled by both invoking the Manson–Coffin curve and other simplified models derived from static properties of the material; some of which showed remarkably good accuracy. A quantitative comparison with a wrought‐processed 316L steel displayed a markedly different cyclic elastoplastic response but comparable fatigue strengths.

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Section: Cyclic Stress Responsesupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Strain‐controlled fatigue loading of an additively manufactured AISI 316L steel: Cyclic plasticity model and strain–life curve with a comparison to the wrought material

Pelegatti

Benasciutti

Bona

et al. 2023

Fatigue Fract Eng Mat Struct

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“…This treatment, which is similar with that used in the literature, 47 aims at mitigating the residual stresses without modifying the as-built microstructure of 316L SS. It should be mentioned that a procedure with a holding temperature of 900 C for 2 h followed by water F I G U R E 1 Cyclic hardening/softening curves of (A) different surface-treated samples under Δε/2 = ±0.5% (wrought 316L), 44 (B) samples loaded with various strain paths (cold worked 316L), 45 (C) samples under different loading levels (selective laser melting (SLM) 316L) 46 [Colour figure can be viewed at wileyonlinelibrary.com] quenching is recommended by ASM 2759 to eliminate the residual stress. However, such a heat treatment will change the microstructure.…”

Section: Specimens Preparationmentioning

confidence: 99%

“…L‐PBF has a similar strengthening mechanism. Yu et al performed LCF tests for the L‐PBF 316L 46 . A continuous softening occurs because the dislocations undergo unpinning from the cell boundaries and planar movement, as shown in Figure 1C.…”

Section: Introductionmentioning

confidence: 99%

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Correlation between microstructure and cyclic behavior of 316L stainless steel obtained by Laser Powder Bed Fusion

Liang

Hor

Robert

et al. 2022

Fatigue Fract Eng Mat Struct

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In this work, stainless steel 316L obtained by Laser Powder Bed Fusion (L-PBF) has been produced and characterized. The experimental campaign focuses on the samples in the as-built state under cyclic tension-compression loadings. Low cycle fatigue (LCF) and high cycle fatigue (HCF) tests are carried out. Microstructure observations are performed before and after the loadings. As-built L-PBF 316L has a good LCF performance despite the presence of surface defects but a low fatigue limit in the HCF regime. Removing the surface roughness has a beneficial effect but does not improve the fatigue strength to that of machined wrought 316L. Observations on the microstructure of fatigue samples indicate that LCF is dominated by the local plastic deformation, which is mostly achieved by the slip in the studied material and is not sensitive to the defect. The lack-of-fusion defect impairs the fatigue resistance in the HCF regime.

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Effect of Part Thickness and Build Angle on the Microstructure, Surface Roughness, and Mechanical Properties of Additively Manufactured IN-939

Fardan

Klement

Brodin

et al. 2022

Metall Mater Trans A

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Powder bed fusion-laser beam of metals (PBF-LB/M) has attracted significant interest due to the possibility of producing dedicated design features like thin-walled structures, even though their mechanical response and microstructure are not well understood. Hence, thin-walled IN-939 structures of different thicknesses (0.5, 1 and 2 mm) were manufactured at two build angles (90 and 45 deg) by PBF-LB/M. A preferred 〈100〉 crystallographic orientation was found along the build direction in all cases. The crystallographic texture intensity and surface roughness increased as the part thickness decreased for 90 deg and increased for 45 deg build angle. Reduction in wall thickness resulted in a decrease in the tensile properties, e.g., YS decreases by up to 33 pct and UTS decreases by up to 30 pct in comparison with the bulk specimen which had YS of 1051 ± 11 MPa and UTS of 1482 ± 9 MPa. Obtained results indicate that the apparent difference in tensile properties is primarily due to the overestimation of the load-bearing area. Two methods to estimate the accurate tensile properties based on roughness compensation are presented, using of which the corrected tensile performance of the thin-walled specimens was comparable with a standard tensile specimen.

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Low cycle fatigue of additively manufactured thin-walled stainless steel 316L

Cited by 27 publications

References 49 publications

Strain‐controlled fatigue loading of an additively manufactured AISI 316L steel: Cyclic plasticity model and strain–life curve with a comparison to the wrought material

Strain‐controlled fatigue loading of an additively manufactured AISI 316L steel: Cyclic plasticity model and strain–life curve with a comparison to the wrought material

Correlation between microstructure and cyclic behavior of 316L stainless steel obtained by Laser Powder Bed Fusion

Effect of Part Thickness and Build Angle on the Microstructure, Surface Roughness, and Mechanical Properties of Additively Manufactured IN-939

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