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

Liang, Xiaoyu; Hor, Anis; Robert, Camille; Salem, Mehdi; Morel, Franck

doi:10.1111/ffe.13684

Cited by 12 publications

(4 citation statements)

References 60 publications

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“…[62][63][64] The literature data are shown in Figure 12B and agrees well with our experimental data, especially for longer lifetimes. Therefore, for higher lifetimes, defects seem to have higher detrimental impact on fatigue resistance, 65 as the gap between SLM_Chess fatigue strength and SLM_Rot or SLM_SR ones is higher for longer lifetimes. However, for short lifetimes (N < 10 5 ), the fatigue resistance of specimens with fatigue cracks initiating from the LoF (SLM_Chess) is comparable to that of the specimens where cracks initiate from the persistent slip band (PSB) in the microstructure (SLM_Rot and SLM_SR).…”

Section: Fatigue Behaviormentioning

confidence: 99%

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Roirand

Hor

Malard

et al. 2022

Fatigue Fract Eng Mat Struct

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The particular roles of grain morphology and defects, controlled using laser‐scan strategies, on the mechanical properties and the fatigue behavior of 316L stainless steel are investigated. Microstructural characterization and X‐ray tomography analysis was performed to understand the genesis of polycrystalline microstructure and defects. Tensile and fatigue tests were performed to analyze the effect of defect population and microstructural properties on plasticity and damage mechanisms during monotonic and cyclic loading. The effect of the grain‐size and shape and type of defect was carefully investigated to evaluate the mechanisms driving the mechanical behavior under quasi‐static and fatigue loading. It is shown that the laser‐scan strategy determines the anisotropy in the plane perpendicular to the building direction. Moreover, contrary to the existing literature, for 316L obtained by AM, the grain size and shape does not affect the mechanical properties, and LoF defects drive the fatigue life, independent of the defect/grain size ratio.

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Section: Fatigue Behaviormentioning

confidence: 99%

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Roirand

Hor

Malard

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Low-cycle and high-cycle fatigue tests have been performed on 316L steel samples produced by laser powder bed fusion technique, and a correlation between microstructure and cyclic mechanical behavior has been obtained. [14] 316L revealed a good performance under low-cycle fatigue tests, but surface defects on the sample have shown to be detrimental to the fatigue limit in the high-cycle fatigue regime. Microstructure observations of samples under low-cycle fatigue tests have revealed that local plastic deformations influence material behavior by slip steps but lack-of-fusion defects limit the high-cycle fatigue resistance.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Sensitive Crystal Plasticity Modeling for Austenitic Steel and Nickel-Based Superalloy Under Isothermal Fatigue Loading

Shahmardani

Hartmaier

2023

Metall Mater Trans A

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Intermittent mechanical loads combined with high temperatures appear during the operation of turbines in jet engines or in power plants, which can lead to high-temperature fatigue or to thermomechanical fatigue. Since the assessment of fatigue properties is a complex and time-consuming process, it is essential to develop validated material models that are capable of predicting fatigue behavior, thus allowing the extrapolation of experimental results into a broader range of thermomechanical conditions. To accomplish this, two representative volume elements (RVEs), mimicking the typical microstructure of single crystal Ni-based superalloys and polycrystalline austenitic steels, respectively, are introduced. With the help of these RVEs, the temperature and deformation-dependent internal stresses in the microstructure can be taken into account. In the next step, phenomenological crystal plasticity models are implemented and parameterized for cyclic deformation of these two materials. The RVE, constitutive model, and the material parameters for the Ni-based superalloy are taken from a former study. For the austenitic steel, however, an inverse procedure has been used to identify its material parameters based on several isothermal fatigue tests in a wide temperature range. With the identified material parameters, a valid description of the isothermal fatigue behavior at different temperatures is possible. The most important conclusion from the comparison of the isothermal fatigue behavior of the two different materials is that the kinematic hardening, which is responsible for the shape of the hysteresis loops, is entirely described by the internal stresses within the typical microstructure of the Ni-based superalloy, which is modeled in a scale-bridging approach. Hence, no additional terms for kinematic hardening need to be introduced to describe the cyclic plasticity in the superalloy. For the austenitic steel, in contrast, the Ohno–Wang model for kinematic hardening needs to be considered additionally to the internal stresses in the polycrystalline microstructure to obtain a correct description of its cyclic plasticity.

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“…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%

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

Cited by 12 publications

References 60 publications

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Microstructure-Sensitive Crystal Plasticity Modeling for Austenitic Steel and Nickel-Based Superalloy Under Isothermal Fatigue Loading

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

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