Low cycle fatigue behavior of wire arc additive manufactured and solution annealed 308 L stainless steel

Yuan, Yutong; Wang, Dexin; Fu, Shencheng; Song, Danrong; Vedani, Maurizio; Xu, Cheng

doi:10.1016/j.addma.2022.102688

Cited by 17 publications

(13 citation statements)

References 45 publications

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“…Dislocations cell and precipitations act as barriers for slip leading to dislocations piling up around the large grain, 77 and their interaction causes the initial hardening. When subjected to inelastic cyclic loading, the existing dislocation structure is rearranged into a configuration that easier for deformation, leading to cyclic softening 78 . The resolved shear stress acting on slip planes is responsible for slip 71 .…”

Section: Resultsmentioning

confidence: 99%

“…When subjected to inelastic cyclic loading, the existing dislocation structure is rearranged into a configuration that easier for deformation, leading to cyclic softening. 78 The resolved shear stress acting on slip planes is responsible for slip. 71 As confirmed by Section 3.4, the crack originated from the activated slip plane.…”

Section: Microstructure Evolution and Deformation Mechanismmentioning

confidence: 99%

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The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

Liu,

Cai,

Wang

et al. 2023

Fatigue Fract Eng Mat Struct

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Symmetrical high‐temperature low‐cycle fatigue tests were performed in this study to examine the influence of temperature on the fatigue failure mechanism of the additively manufactured Inconel 625. According to the fracture analysis, cracks initiate from the crystallographic plane at room temperature. At 600°C, oxidation of carbides leads to crack initiation. The strengthening effect of γ″ precipitation prevents crack propagating within the matrix. At 750°C, the crack becomes transgranular propagating, as a consequence of γ″‐δ transformation. Geometrically necessary dislocations distribution on the fracture supports this result. Furthermore, a modified life prediction formula considering effect of temperature and strain amplitude was established. It was observed that the modified model predicted the fatigue life of the studied materials well in both test conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Microstructure Evolution and Deformation Mechanismmentioning

confidence: 99%

The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

Liu,

Cai,

Wang

et al. 2023

Fatigue Fract Eng Mat Struct

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show abstract

“…This means that WAAM potentially induces a higher resistance against fatigue crack growth and less resistance against crack initiation. WAAM 308L SS can be considered substantially defect free since no defects were found in their micro-structural analysis [2]. Also, previously recorded fatigue failures did not show signs of failure initiated by pre-existing defects.…”

Section: Introductionmentioning

confidence: 98%

“…Characterization and observation of the monotonic tensile and cyclic response of the material resulting from additive manufacturing is a topic of interest for research due to common failure modes observed during engineering. Parts manufactured by WAAM are prone to contain defects such as internal pores, cracks, voids, not-melted regions, or lack of fusion defects [2]. These defects may be expected to enlarge the scatter in fatigue life data and reduce the overall fatigue life as compared to non-additively manufactured components.…”

Section: Introductionmentioning

confidence: 99%

“…However, WAAM AISI 304L stainless steel has enhanced or comparable fatigue performance for the transitional (between low-and high-cycle fatigue) and high-cycle fatigue loading regimes compared to wrought and DEDfabricated materials [2] Dedicated fatigue experiments on WAAM 308L SS were performed by [2], by applying fully reversed axial loading to characterize the low-cycle fatigue behavior of WAAM 308L SS and to compare it with hot-rolled 308L SS. From these experiments, it was found that extracting specimens from WAAM plates leads to longer fatigue life at higher stress amplitudes, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Rotating bending fatigue behaviour and quasi‐static tensile properties of Wire Arc Additively Manufactured 308L stainless steel

Leonetti,

de Munnik,

Kassing

et al. 2023

ce papers

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Wire Arc Additive Manufacturing (WAAM) is a direct energy deposition method used to manufacture steel components by using an electric arc as a heat source to melt a metal wire and deposit it layer by layer. In this study, monotonic tensile tests, standardized Charpy impact tests, and rotating bending fatigue tests are executed to characterize the mechanical properties of WAAM 308L stainless steel using specimens extracted from additively manufactured plates. In particular, monotonic tensile properties are investigated in three directions: that is 0, 90, and 45 degrees with respect to the plane of deposition, whereas the fatigue strength is quantified for one direction only, i.e. 90 degrees since this is deemed to be the weakest.The mechanical characterization highlights that WAAM 308L SS shows an anisotropic behaviour, an enhanced strain‐rate sensitivity, and an overall reduced yield strength as compared to the base material 308L. The anisotropic material behaviour is explained by the microstructure morphology since the austenite grains form anisotropic columnar zones due to an uneven heat profile during production. During the fatigue tests, the relatively high strain rate sensitivity causes susceptibility to self‐heating at relatively low loading frequencies, i.e. below 100Hz.

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Additive Manufacturing of a Steel Splice Joint for Tubular Elements in a Modular Wind Tower

Morales,

Tankova,

Branco

et al. 2023

ce papers

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Wind turbines of large size pose a challenge to structural engineers in providing suitable supporting structures. Nevertheless, these structures frequently result in complex logistical requirements, raising the expenses of new projects. Hence, the design philosophy is shifting towards lighter and modular towers, which often use tubular components. However, due to the intricate shape of the joints, connecting these tubular components is costly and laborious. Therefore, considering the advantages of new fabrication techniques, such as additive manufacturing, a ‘plug and play’ (PnP) device is in development to satisfy the requirements of a splice joint part of an onshore modular tower supporting a wind energy converter. An optimisation methodology was developed to determine the geometry of the device by structural topology optimisation and validate using finite element method software. As result from this methodology, three optimised geometries able to meet the desired requirements were found. Finally, the PnP device delivered a bespoke solution that allows for the simple joining of modular tubular components and reduces the raw material consumption without compromising the performance of the joint.

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Low cycle fatigue behavior of wire arc additive manufactured and solution annealed 308 L stainless steel

Cited by 17 publications

References 45 publications

The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

Rotating bending fatigue behaviour and quasi‐static tensile properties of Wire Arc Additively Manufactured 308L stainless steel

Additive Manufacturing of a Steel Splice Joint for Tubular Elements in a Modular Wind Tower

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