Fatigue assessment of as‐built and heat‐treated Inconel 718 specimens produced by additive manufacturing including notch effects

Solberg, Klas; Wan, Di

doi:10.1111/ffe.13300

Cited by 39 publications

(12 citation statements)

References 44 publications

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“…Studies performed on fatigue assessment of notched AM parts reveal that despite the fact that the notch root is characterized with significant stress concentration due to geometrical discontinuity, fatigue fractures does not necessarily occur on the notch root plane and in most cases the cracks initiate from surface imperfections of downward face 66 . To consider this effect, parameter of relative height ( h / h 0 ), which can be calculated as the ratio of the distance of the failure initiation site from the notch root ( h ) to the total notch opening distance ( h 0 ) is used to describe the fracture site condition.…”

Section: Resultsmentioning

confidence: 99%

The efficiency of tumble finishing as a final post-treatment for fatigue enhancement of notched laser powder bed fusion AlSi10Mg

Maleki

Bagherifard

Ünal

et al. 2023

Sci Rep

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A hybrid post-treatment combining tumble finishing as a final step after shot peening and heat treatment was developed to alleviate the adverse effects of internal and surface defects on the fatigue performance of laser powder bed fusion AlSi10Mg samples. The effects of each post-treatment were investigated individually and synergistically on microstructure, surface morphology and roughness, hardness, residual stresses, porosity, and rotating bending fatigue behavior of V-notched AlSi10Mg samples. The results reveal that tumble finishing can highly reduce surface roughness by 28 and 32% compared to the as-built and heat-treated states while inducing extra surface layer hardening and compressive residual stresses. The hybrid post-treatment of heat treatment + shot peening + tumble finishing significantly increased the fatigue life of the samples by over 500 times higher compared to the as-built series.

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Section: Resultsmentioning

confidence: 99%

The efficiency of tumble finishing as a final post-treatment for fatigue enhancement of notched laser powder bed fusion AlSi10Mg

Maleki

Bagherifard

Ünal

et al. 2023

Sci Rep

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“…Postprocessing is one of the three main stages of AM and is a necessary step especially for metal AM parts. Among the postproduction treatments that improve fatigue strength in AM, there are processes acting on the residual stresses (shot peening [SP] and laser peening [LP]), on the surface defects (machining the surfaces of the materials and machining), and on the internal pores (hot isostatic pressing [HIP]) 127,128 . In AM, the postmanufacturing processing step is implemented as a very important part of the supply chain.…”

Section: Effects Of Postproduction Processes On Fatigue Life Of Metal...mentioning

confidence: 99%

An overview of factors affecting high‐cycle fatigue of additive manufacturing metals

Karakaş

Kardeş

Foti³

et al. 2023

Fatigue Fract Eng Mat Struct

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Recently, additive manufacturing technologies have become very important in the industry as they increase the freedom of design and provide the opportunity to realize very complex shapes in one step. Since the use of additive manufacturing has increased in addition to conventional manufacturing methods, the fatigue behavior of engineering materials such as AlSi10Mg, 316L, Ti6Al4V, and Ti64 produced by different additive manufacturing methods is reviewed. In this article, a detailed literature review is presented by evaluating recent studies on the high‐cycle and very high‐cycle fatigue behavior of engineering components produced with additive manufacturing technologies. In addition to the positive properties of additive manufacturing metals, fatigue performance is adversely affected due to negative properties such as high porosity, poor surface quality, and tensile residual stresses. In this article, factors affecting fatigue strength and postproduction processes required for the production of fatigue‐resistant additive manufacturing parts are explained.

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“…[22,23] However, laser-based additive manufacturing often leads to a tendency toward exclusively columnar grains. [24] To this end, the focus of this work is to develop a mechanistic understanding of the influence of microstructural variability on the fatigue behavior of IN718 with columnar grains. To this end, we use the mesoscale crystal plasticity (CP) implemented using the finite element approach [25] to analyze the fatigue behavior under straincontrolled conditions.…”

Section: Doi: 101002/adem202001031mentioning

confidence: 99%

Fatigue Behavior of Additively Manufactured IN718 with Columnar Grains

Akram

Mushongera

2020

Adv Eng Mater

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Fatigue failure of polycrystalline materials is often dominated by crack initiation processes, which are strongly influenced by salient features existing in the microstructure. Herein, a crystal plasticity framework based on the finite element method is used to quantitatively assess the mechanistic drivers existing in columnar IN718 polycrystals for fatigue crack nucleation. To that end, microstructurally differing polycrystalline samples are subjected to strain‐controlled cyclic loading at ambient conditions to elucidate the microstructural mechanisms of fatigue damage. 2D grain structures obtained from the cellular automata (CA) simulations of the additive manufacturing of IN718 are utilized to construct representative 3D microstructures for use in computational analyses. A criterion related to the stored energy density (SED) is used to predict the scatter in fatigue crack nucleation life. This criterion presents a unique and consistent approach toward predicting fatigue crack initiation at the microstructural scale. It is demonstrated that SED is necessary and sufficient to drive crack nucleation in low cycle fatigue. The results show that grain boundaries are the preferred crack initiation sites.

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Fatigue assessment of as‐built and heat‐treated Inconel 718 specimens produced by additive manufacturing including notch effects

Cited by 39 publications

References 44 publications

The efficiency of tumble finishing as a final post-treatment for fatigue enhancement of notched laser powder bed fusion AlSi10Mg

The efficiency of tumble finishing as a final post-treatment for fatigue enhancement of notched laser powder bed fusion AlSi10Mg

An overview of factors affecting high‐cycle fatigue of additive manufacturing metals

Fatigue Behavior of Additively Manufactured IN718 with Columnar Grains

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