Process dependent porosity and the influence of shot peening on porosity morphology regarding selective laser melted AlSi10Mg parts

Damon, James; Dietrich, Stefan; Vollert, Florian; Gibmeier, Jens; Schulze, Volker

doi:10.1016/j.addma.2018.01.001

Cited by 92 publications

(65 citation statements)

References 23 publications

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“…P2 and P3 specimens were built along two directions, namely XY and Z as defined in Figure 1-a. P2 fatigue test specimens were machined (MA) from the bars in order to overcome the manufacturing gross surface integrity effects, namely the surface roughness and the presence of a population of defects in the subsurface due to edge lasing [5,6]. One bar corresponds to one specimen.…”

Section: Samples Fabricationmentioning

confidence: 99%

Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy.

et al. 2018

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This work concerns the fatigue resistance of a AlSi10Mg material produced by additive manufacturing, and more precisely the competition between as built manufacturing surface and as-machined surface on the fatigue resistance. Samples were built by a powder-bed process with an EOS-M280 machine using standard in two configurations (0° and 90°) in order to evaluate the impact of building direction on fatigue life. The impact of as-built surface on fatigue behavior is quantified for each specimen configuration. A T6 heat treatment is performed on samples in order to evaluate the impact of microstructure on fatigue behavior. For each configurations, the S-N curves is determined in as-built and T6 materials with a load ratio R= -1. The fracture surfaces are carefully analyzed in order to determine the critical defect size for each sample. A Kitagawa type diagram representing the fatigue limit as a function of the defect size is derived from these measurements. All the results were compared to those obtained in asmachined samples.

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Section: Samples Fabricationmentioning

confidence: 99%

Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy.

et al. 2018

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“…AlMangour et al [17] reported that SP improves the surface roughness, hardness, fatigue, and yield strength of additively manufactured 17-4 stainless steel. Damon et al [18] also studied the effect of SP on the porosity formed inside AlSi10Mg parts. They showed that SP using S170 steel beads reduces the porosity by 0.1-0.3% and increases the fatigue strength of the as-built parts.…”

Section: Introductionmentioning

confidence: 99%

Influence of Shot Peening on AlSi10Mg Parts Fabricated by Additive Manufacturing

Maamoun

Elbestawi

Veldhuis

2018

JMMP

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Abstract:The additive manufacturing (AM) of aluminum alloys promises to considerably enhance the performance of lightweight critical parts in various industrial applications. AlSi10Mg is one of the compatible Al alloys used in the selective laser melting of lightweight components. However, the surface defects obtained from the as-built parts affect their mechanical properties, and thus represent an obstacle to using them as final products. This study aims to improve the surface characteristics of the as-built AlSi10Mg parts using shot peening (SP). To achieve this goal, different SP intensities were applied to various surface textures of the as-built samples. The SP results showed a significant improvement in the as-built surface topography and a higher value of effective depth using 22.9 A intensity and Gp165 glass beads. The area near the shot-peened surface showed a significant microstructure refinement to a specific depth due to the dynamic precipitation of nanoscale Si particles. Surface hardening was also detected and high compressive residual stresses were generated due to severe plastic deformation. The surface characteristics obtained after SP could result in a significant improvement in the mechanical properties and fatigue strength, and thus promise performance enhancement for critical parts in various industrial applications.

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“…Contrastingly, diffraction methods (such as X-ray diffraction (XRD) [10] and neutron diffraction (ND) [11,12]) are non-destructive. They can be used to obtain full-field strain/stress distribution by measuring at multiple positions on the sample surface [13][14][15][16] or can be combined with material removal techniques to acquire the in-depth distribution of residual stresses [17][18][19][20][21]. Nowadays, XRD becomes major non-destructive residual stresses measurement method because of its relative affordability and easy accessibility.…”

Section: Introductionmentioning

confidence: 99%

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

Chen

Sun

Li³

et al. 2020

Materials

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Selective laser melting (SLM) is known to generate large and anisotropic residual stresses in the samples. Accurate measurement of residual stresses on SLM-produced samples is essential for understanding the residual stress build-up mechanism during SLM, while a dramatic fluctuation can be observed in the residual stress values reported in the literature. On the basis of studying the influence of surface roughness on residual stress measured using X-ray diffraction (XRD), we propose a procedure coupling XRD technique with pretreatment consisting of mechanical polishing and chemical etching. The results highlight that residual stresses measured using XRD on as-built SLM-produced samples with high surface roughness are significantly lower than those measured on samples with finished surface, which is due to the stress relaxation on the spiked surface of as-built samples. Surface distribution of residual stresses and the effect of scanning strategy were systematically investigated for SLM-produced AlSi10Mg samples. Microstructural morphology was observed at the interface between sample and building platform and was linked to the surface distribution of residual stresses. This procedure can help us accurately measure the residual stresses in SLM-produced samples and thus better understand its build-up mechanism during the SLM process.

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Process dependent porosity and the influence of shot peening on porosity morphology regarding selective laser melted AlSi10Mg parts

Cited by 92 publications

References 23 publications

Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy.

Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy.

Influence of Shot Peening on AlSi10Mg Parts Fabricated by Additive Manufacturing

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

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