Application of the Theory of Critical Distances to predict the effect of induced and process inherent defects for SLM Ti-6Al-4V in high cycle fatigue

Gillham, Bobby; Yankin, Andrey; McNamara, Fionnan; Tomonto, Charles; Taylor, David; Lupoi, Rocco

doi:10.1016/j.cirp.2021.03.004

Cited by 16 publications

(7 citation statements)

References 7 publications

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“…Active research is underway into SLM materials and by now the effect of melting modes on the density, structure, and physical and mechanical properties of various SLM materials has been studied comprehensively [ 6 , 7 , 8 , 9 , 10 ]. Their corrosion resistance [ 2 , 4 , 9 , 10 , 11 ], deformation behavior at elevated temperatures [ 5 , 8 , 12 , 13 , 14 ], resistance to fatigue failure [ 3 , 8 , 11 , 15 , 16 , 17 ], and other properties are being actively investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen on the Structure and Mechanical Properties of 316L Steel and Inconel 718 Alloy Processed by Selective Laser Melting

Maksimkin¹,

Yukhimchuk²,

Malkov³

et al. 2022

Materials

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The interaction of hydrogen with specimens of 316L steel and Inconel 718 alloy processed by selective laser melting (SLM) was studied. The effect of hydrogen on the mechanical properties of SLM materials, hydrogen permeability, and microstructure was investigated; besides, these values were compared with the properties of conventionally produced materials. It was shown that SLM can be successfully used to produce parts for operation in hydrogen environments at high pressure at room temperature.

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Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen on the Structure and Mechanical Properties of 316L Steel and Inconel 718 Alloy Processed by Selective Laser Melting

Maksimkin¹,

Yukhimchuk²,

Malkov³

et al. 2022

Materials

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“…The presence of process inherent defects within SLM Ti-6Al-4V material is well established. However, as previously documented in [38], two differing forms of TCD methods (PM and LM) display sufficient accuracy in predicting the fatigue limit of notched components. This includes modelling an irregular SLM surface as a micro-crack notch for the implementation of TCD methods.…”

Section: Discussionmentioning

confidence: 70%

The Analysis of Small-Scale Notches on the Fatigue Performance of SLM Ti-6Al-4V; A Theory of Critical Distances Approach

Gillham

Yankin

Shipley

et al. 2022

KEM

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Selective Laser Melting is an additive manufacturing practice that permits the production of metal alloy-based parts. While facilitating the design of complex geometry, SLM leads to the fabrication of a unique material structure that showcases distinct behavioural characteristics relative to their traditional methods of material manufacture. Defects that are innate to SLM inspire the presence of a compositional outlook that is inhomogeneous in nature and only serves to hinder part efficiency. Thus, the Theory of Critical Distances offers a refreshed proposal to evaluating notched Ti-6Al-4V material produced by additive manufacturing processes. Key principles of the theory’s working mechanisms are outlined. Subsequently, symmetrical notches of contrasting size are assessed. Findings reveal that the Theory of Critical Distances is adequately compatible with accurate fatigue prediction of SLM Ti-6Al-4V in its as-built state. Additionally, fracture surface analysis reveals that crack initiation is predominantly a surface-based phenomenon. Hereby, increased focus must be given to the quality of processed material that is located at the externalities of additively manufactured components, in order to enhance their service life capabilities. This will induce an increasingly uniform material structure that will allow for more predictable behavioural characteristics.

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“…Further, surface topography and sub-surface defects play a major role in determining fatigue life. These conclusions are exemplified in [2] where the highcycle fatigue of the as-built laser V-notched specimens generated in T6Al4V by powder bed fusion (LBPF). Similar results were found in [3] where the as-built LPBF Ti6Al4V was subjected to three-point bending fatigue testing.…”

Section: Introductionmentioning

confidence: 93%

Ti6Al4V titanium alloy fatigue strength after AM- and machining-based process chains

et al. 2022

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Application of the Theory of Critical Distances to predict the effect of induced and process inherent defects for SLM Ti-6Al-4V in high cycle fatigue

Cited by 16 publications

References 7 publications

Effect of Hydrogen on the Structure and Mechanical Properties of 316L Steel and Inconel 718 Alloy Processed by Selective Laser Melting

Effect of Hydrogen on the Structure and Mechanical Properties of 316L Steel and Inconel 718 Alloy Processed by Selective Laser Melting

The Analysis of Small-Scale Notches on the Fatigue Performance of SLM Ti-6Al-4V; A Theory of Critical Distances Approach

Ti6Al4V titanium alloy fatigue strength after AM- and machining-based process chains

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