Fatigue crack growth anisotropy, texture and residual stress in austenitic steel made by wire and arc additive manufacturing

Gordon, Jerard V.; Haden, Christina Viau; Nied, H. F.; Vinci, Richard P.; Harlow, D. Gary

doi:10.1016/j.msea.2018.03.075

Cited by 138 publications

(44 citation statements)

References 17 publications

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“…Similar results were reported by Zhang et al (2016). Gordon et al (2018) performed FCG tests on 304L stainless steel WAAM built SEN(B) specimens and observed favourable behaviour in the Paris region compared to the conventional wrought stainless steel. It was also reported that as-built parts offer higher FCG resistance.…”

Section: Introductionsupporting

confidence: 82%

Fatigue crack growth behaviour of wire and arc additively manufactured ER70S-6 low carbon steel components

et al. 2021

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The new emerging Wire and Arc Additive Manufacturing (WAAM) technology has significant potential to improve material design and efficiency for structural components as well as reducing manufacturing costs. Due to repeated and periodic melting, solidification and reheating of the layers, the WAAM deposition technique results in some elastic, plastic and viscous deformations that can affect material degradation and crack propagation behaviour in additively manufactured components. Therefore, it is crucial to characterise the cracking behaviour in WAAM built components for structural design and integrity assessment purposes. In this work, fatigue crack growth tests have been conducted on compact tension specimens extracted from ER70S-6 steel WAAM built components. The crack propagation behaviour of the specimens extracted with different orientations (i.e. horizontal and vertical with respect to the deposition direction) has been characterised under two different cyclic load levels. The obtained fatigue crack growth rate data have been correlated with the linear elastic fracture mechanics parameter $$\varDelta K$$ Δ K and the results are compared with the literature data available for corresponding wrought structural steels and the recommended fatigue crack growth trends in the BS7910 standard. The obtained results have been found to fall below the recommended trends in the BS7910 standard and above the data points obtained from S355 wrought material. The obtained fatigue growth trends and Paris law constants from this study contribute to the overall understanding of the design requirements for the new optimised functionally graded structures fabricated using the WAAM technique.

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Section: Introductionsupporting

confidence: 82%

Fatigue crack growth behaviour of wire and arc additively manufactured ER70S-6 low carbon steel components

et al. 2021

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“…In contrast, a more forward and less tortuous crack path with fatigue cracks predominantly growing along grain boundaries was noticed in the case of a specimen tested along the printing direction. In addition to the highly tortuous crack observed in the case of a perpendicular specimens, local mixed-mode fracture was also highlighted with the crack path often changing directions [69]. Therefore, these explanations could be a key to understand the anisotropy highlighted during cyclic tests, and the mechanism conducting to a favorable perpendicular configuration.…”

Section: Comparison Of the Self-heating Curvesmentioning

confidence: 93%

Self-heating behavior during cyclic loadings of 316L stainless steel specimens manufactured or repaired by Directed Energy Deposition

Balit

Joly

Szmytka

et al. 2020

Materials Science and Engineering: A

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The purpose of this article is to assess a self-heating testing method for the characterization of fatigue properties of single-track thickness additively manufactured specimens. It also evaluates the impact of the microstructure orientation with respect to the loading direction on the dissipative behavior and the initiation of microcracks. The 316L stainless steel specimens under scrutiny were manufactured by Directed Energy Deposition in two configurations: (i) fully printed specimens (2 orientations) and (ii) repaired specimens. The paper first presents a morphologic and crystallographic texture analysis and second, a series of self-heating tests under cyclic loading. The microstructural analysis revealed elongated grains with their sizes, shapes and preferred orientations controlled by process parameters. The self-heating measurements under cyclic tensile loading proved that the dissipation estimation through infrared measurements can be performed on small scale, thin specimens. The self-heating curves could successfully be represented by the Munier model. Moreover, several links between the printing parameters and self-heating results could be established. For example, a smaller vertical increment between successively deposited layers leads to higher mean

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“…The still limited to few studies [20][21][22]. In the work done by Gordon and coauthors [21], Young's modulus values are reported, indicating values around 130 to 140 GPa, significantly lower than the one registered by the conventional wrought material (about 200 GPa). Haden et al [20] registered non-negligible anisotropy for WAAM stainless steel specimens in terms of ultimate tensile strength and elongation at rupture.…”

Section: Nomenclaturementioning

confidence: 97%

Assessment of design mechanical parameters and partial safety factors for Wire-and-Arc Additive Manufactured stainless steel

Laghi

Palermo

Gasparini

et al. 2020

Engineering Structures

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Fatigue crack growth anisotropy, texture and residual stress in austenitic steel made by wire and arc additive manufacturing

Cited by 138 publications

References 17 publications

Fatigue crack growth behaviour of wire and arc additively manufactured ER70S-6 low carbon steel components

Fatigue crack growth behaviour of wire and arc additively manufactured ER70S-6 low carbon steel components

Self-heating behavior during cyclic loadings of 316L stainless steel specimens manufactured or repaired by Directed Energy Deposition

Assessment of design mechanical parameters and partial safety factors for Wire-and-Arc Additive Manufactured stainless steel

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