Fatigue behavior of additive manufactured 316L stainless steel parts: Effects of layer orientation and surface roughness

Shrestha, Rakish; Simsiriwong, Jutima; Shamsaei, Nima

doi:10.1016/j.addma.2019.04.011

Cited by 98 publications

(87 citation statements)

References 38 publications

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“…A smaller layer thickness also leads to increased LCF lifetimes, which is confirmed in [11] for LCF tests and in [16] for HCF tests. The LCF lifetimes of various additively manufactured materials are assessed in [9,[11][12][13] with the effective cyclic J-integral ΔJ eff expression from Dowling [55]. The approaches with similar formulations for ΔJ eff have also demonstrated to be successful for lifetime assessment.…”

Section: Discussionmentioning

confidence: 99%

“…For dynamically loaded applications, high-cycle fatigue (HCF) tests are performed to determine the fatigue strength [7][8][9][10]. Current research is dealing with the material characterization for a wide spectrum of loading conditions, so that in addition to HCF, the low-cycle fatigue (LCF) properties of additive materials are investigated more intensively [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The √ area concept is also adapted in [9,11] for the LCF lifetime prediction of additive manufactured AlSi10Mg by using elastic-plastic fracture mechanics based on the cyclic J-integral ΔJ. The identical fracture mechanics approach is applied for the fatigue life prediction of additive manufactured Ti-6Al-4V in [12] and 316L stainless steel in [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Lifetime assessment of the process-dependent material properties of additive manufactured AlSi10Mg under low-cycle fatigue loading

Fischer

Schweizer

2020

MATEC Web Conf.

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Systematic low-cycle fatigue (LCF) experiments are carried out on additive manufactured AlSi10Mg specimens for several material conditions with varying layer thickness, heat treatment, building direction and surface quality. The deformation behaviour depends significantly on the heat treatment. It is outlined that the process control and heat treatment can produce fatigue properties comparable with the cast material, whereby an as-built specimen surface leads to a lifetime reduction in all cases. The experiments are accompanied with detailed metallo- and fractographic investigations. For all tested LCF specimens, the defect type and the failure origin defect size are characterized in terms of the √area parameter by using scanning electron microscopy. The failure of the specimen is mostly caused by lack of fusion surface or near-surface defects, whereby the defect size is determined by the SLM process parameters, such as building direction, surface quality and layer thickness. On the basis of the experimental data and the observed defects, a mechanism-based, deterministic lifetime model is developed and adapted to the specific damage mechanisms of the additive manufactured AlSi10Mg alloy.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lifetime assessment of the process-dependent material properties of additive manufactured AlSi10Mg under low-cycle fatigue loading

Fischer

Schweizer

2020

MATEC Web Conf.

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“…7 Process plan alternatives generated for the particular case study treatment. Although 316L cannot be heat treated, AM of 316L alloys has been successfully used in the past [32][33][34][35][36][37], even for repair purposes [38], and its fatigue life has been deemed satisfactory [39][40][41]. The processes used in this case are DLM, milling, and vision-based metrology, but additional processes could be considered as appropriate.…”

Section: Case Studymentioning

confidence: 99%

Hybrid subtractive–additive manufacturing processes for high value-added metal components

Stavropoulos

Bikas

Avram

et al. 2020

Int J Adv Manuf Technol

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Hybrid process chains lack structured decision-making tools to support advanced manufacturing strategies, consisting of a simulation-enhanced sequencing and planning of additive and subtractive processes. The paper sets out a method aiming at identifying an optimal process window for additive manufacturing, while considering its integration with conventional technologies, starting from part inspection as a built-in functionality, quantifying geometrical and dimensional part deviations, and triggering an effective hybrid process recipe. The method is demonstrated on a hybrid manufacturing scenario, by dynamically sequencing laser deposition (DLM) and subtraction (milling), triggered by intermediate inspection steps to ensure consistent growth of a part.

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“…Researchers have studied force-controlled fatigue tests using tension or rotating methods for steels, such as SS 17-4PH [19,24,25], SS 15-5PH [15][16][17][18], and SS 316L [15][16][17][18][19], produced using different laser systems such as EOS M270, Concept Laser M1, etc. There are also limited strain-controlled fatigue analyses of laser-printed steel in the literature [26,27]. Figure 1 shows the stress-life (S-N) data which have been extracted, with a reasonable degree of accuracy, from literature data, for SS 316L with different surface and heat treatment conditions.…”

Section: Introductionmentioning

confidence: 99%

Influences of Horizontal and Vertical Build Orientations and Post-Fabrication Processes on the Fatigue Behavior of Stainless Steel 316L Produced by Selective Laser Melting

et al. 2019

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In this paper, the influences of build orientation and post-fabrication processes, including stress-relief, machining, and shot-peening, on the fatigue behavior of stainless steel (SS) 316L manufactured using selective laser melting (SLM) are studied. It was found that horizontally-built (XY) and machined (M) test pieces, which had not been previously studied in the literature, in both stress-relieved (SR) or non-stress-relieved (NSR) conditions show superior fatigue behavior compared to vertically-built (ZX) and conventionally-manufactured SS 316L. The XY, M, and SR (XY-M-SR) test pieces displayed fatigue behavior similar to the XY-M-NSR test pieces, implying that SR does not have a considerable effect on the fatigue behavior of XY and M test pieces. ZX-M-SR test pieces, due to their considerably lower ductility, exhibited significantly larger scatter and a lower fatigue strength compared to ZX-M-NSR samples. Shot-peening (SP) displayed a positive effect on improving the fatigue behavior of the ZX-NSR test pieces due to a compressive stress of 58 MPa induced on the surface of the test pieces. Fractography of the tensile and fatigue test pieces revealed a deeper understanding of the relationships between the process parameters, microstructure, and mechanical properties for SS 316L produced by laser systems. For example, fish-eye fracture pattern or spherical stair features were not previously observed or explained for cyclically-loaded SLM-printed parts in the literature. This study provides comprehensive insight into the anisotropy of the static and fatigue properties of SLM-printed parts, as well as the pre- and post-fabrication parameters that can be employed to improve the fatigue behavior of steel alloys manufactured using laser systems.

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Fatigue behavior of additive manufactured 316L stainless steel parts: Effects of layer orientation and surface roughness

Cited by 98 publications

References 38 publications

Lifetime assessment of the process-dependent material properties of additive manufactured AlSi10Mg under low-cycle fatigue loading

Lifetime assessment of the process-dependent material properties of additive manufactured AlSi10Mg under low-cycle fatigue loading

Hybrid subtractive–additive manufacturing processes for high value-added metal components

Influences of Horizontal and Vertical Build Orientations and Post-Fabrication Processes on the Fatigue Behavior of Stainless Steel 316L Produced by Selective Laser Melting

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