Fatigue behaviour of maraging steel samples produced by SLM under constant and variable amplitude loading

Branco, R.; Silva, J.; Ferreira, José Manuel Martins; Costa, J.D.; Capela, C.; Berto, Filippo; Santos, L.M.S.; Antunes, F.V.

doi:10.1016/j.prostr.2020.01.002

Cited by 16 publications

(10 citation statements)

References 11 publications

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“…Predictions of the fatigue life were achieved using the energy-based SWT parameter, this parameter has been successfully applied in different situations [ 24 , 25 , 26 , 27 ] using Equation (4) as follows:

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Section: Resultsmentioning

confidence: 99%

“…The initiation of the crack occurred on the surface of the specimens, from a single critical point where, normally, there was a lack of fusion defect, as can be seen in Figure 7b (20× magnification of Figure 7a). Predictions of the fatigue life were achieved using the energy-based SWT parameter, this parameter has been successfully applied in different situations [24][25][26][27] using Equation (4) as follows: Figure 7a shows a smoother fracture surface, typical of a fatigue test performed with a stress amplitude in the elastic regime. The initiation of the crack occurred on the surface of the specimens, from a single critical point where, normally, there was a lack of fusion defect, as can be seen in Figure 7b (20× magnification of Figure 7a).…”

Section: Resultsmentioning

confidence: 99%

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Fatigue Failure from Inner Surfaces of Additive Manufactured Ti-6Al-4V Components

et al. 2021

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Selective laser melting (SLM) is an additive manufacturing process for producing metallic components with complex geometries. A drawback of this process is the process-inherent poor surface finish, which is highly detrimental in materials submitted to fatigue loading situations. The goal of this work is to analyze the fatigue behavior of Ti-6Al-4V specimens with internal axial channels under the following different conditions: hole drilled, hole as manufactured, and hole threaded M4 × 0.7. All the cases studied showed a lower fatigue performance as compared with solid samples due to the surface roughness and geometry effect that produced a surface stress concentration leading to a reduction in fatigue strength. The fractography revealed that crack initiation occurred from the internal surface in all specimens with internal channel mostly from defects as unfused particles and lack of fusion zones, while for the solid specimens crack initiation was observed from the external surface due to insufficient fusion defect. The application of the Smith-Watson-Topper energy-based parameter was revealed to be a good tool for fatigue life prediction of the different series studied.

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…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Fatigue Failure from Inner Surfaces of Additive Manufactured Ti-6Al-4V Components

et al. 2021

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“…Therefore, the SLM process parameters need to be accurately set and controlled in order to obtain the appropriate microstructure and properties of the manufactured parts. Many investigations of additive-manufactured 18Ni-300 maraging steels dealing with the optimization of the process parameters 27,28 and their influence on the mechanical properties and microstructure can be found in the literature 15,[29][30][31][32][33][34] . There are only a few reports comparing AM with conventional maraging steel 31 because it is difficult to compare those materials without considering the heat treatments.…”

Section: Use Of Plasma Nitriding To Improve the Wear And Corrosion Rementioning

confidence: 99%

Use of plasma nitriding to improve the wear and corrosion resistance of 18Ni-300 maraging steel manufactured by selective laser melting

Godec

Podgornik

Kocijan

et al. 2021

Sci Rep

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Abstract18Ni-300 maraging steel manufactured by selective laser melting was plasma nitrided to improve its wear and corrosion resistance. The effects of a prior solution treatment, aging and the combination of both on the microstructure and the properties after nitriding were investigated. The results were compared with conventionally produced 18Ni-300 counterparts subjected to the same heat- and thermo-chemical treatments. The plasma nitriding was performed under the same conditions (temperature of 520 °C and time of 6 h) as the aging in order to investigate whether the nitriding and the aging could be carried out simultaneously in a single step. The aim of this work was to provide a better understanding of the morphology and chemical composition of the nitrided layer in the additive-manufactured maraging steel as a function of the prior heat treatments and to compare the wear and corrosion resistance with those of conventional maraging steel. The results show that nitriding without any prior aging leads to cracks in the compound layer, while nitriding of the prior-heat-treated additive-manufactured maraging steel leads to benefits from the thermochemical treatment in terms of wear and corrosion resistance. Some explanations for the origins of the cracks and pores in the nitride layers are provided.

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“…Differing part quality and microstructure-related factors can lead to inconsistencies in fatigue results among different research groups. The noteworthy fact is that all fatigue results shown in Figure 1, tests in other stress ratio 16,17 (R = 0), rotary-bending mode 18,19 and strain-controlled mode 20 were performed only on polished samples with very fine surface finish. Fatigue behaviour of a highstrength material such as maraging steel is known to be highly sensitive to surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Post‐treatment selection for tailored fatigue performance of 18Ni300 maraging steel manufactured by laser powder bed fusion

Elangeswaran

Gurung

Koch

et al. 2020

Fatigue Fract Eng Mat Struct

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This study investigates the fatigue behaviour of additively manufactured 18Ni300 maraging steel. Specifically, the surface and material parameters impacting fatigue performance are analysed through various post‐treatment combinations. Vertically built miniaturised test samples produced by laser powder bed fusion are tested in as‐built and age‐hardening heat‐treated conditions. To utilise the potential of using additive manufacturing for complex‐shaped parts in which conventional machining tools could have limited access, vibratory finishing and sand blasting are employed. The fatigue results show that in as‐built microstructural condition, both the surface treatments significantly enhanced the fatigue performance, with vibratory finishing outperforming sand blasting owing to better surface finish. After heat treatment, sand‐blasted samples performed better than vibratory‐finished ones because of higher residual stresses. This competing interaction between post‐treatments sheds light on identifying the relative influence of various factors. With systematic postfracture and microstructural analyses highlighting the fatigue influencing factors, recommendations are drawn to select post‐treatments to achieve the desired fatigue performance.

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Fatigue behaviour of maraging steel samples produced by SLM under constant and variable amplitude loading

Cited by 16 publications

References 11 publications

Fatigue Failure from Inner Surfaces of Additive Manufactured Ti-6Al-4V Components

Fatigue Failure from Inner Surfaces of Additive Manufactured Ti-6Al-4V Components

Use of plasma nitriding to improve the wear and corrosion resistance of 18Ni-300 maraging steel manufactured by selective laser melting

Post‐treatment selection for tailored fatigue performance of 18Ni300 maraging steel manufactured by laser powder bed fusion

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