Damage mechanisms in selective laser melted AlSi10Mg under as built and different post-treatment conditions

Zhao, Lv; Macías, Juan Guillermo Santos; Ding, Lipeng; Idrissi, Hosni; Simar, Aude

doi:10.1016/j.msea.2019.138210

Cited by 109 publications

(61 citation statements)

References 33 publications

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“…5 d–f, exhibits an ultrafine distribution of Si acicular and cubic-like Si precipitates in the primary Al cell, while the Si-rich eutectic network remains intact. These observations are summarised in Table 7 and agree with literature 6 , 7 , 34 , 38 , 42 .…”

Section: Discussionsupporting

confidence: 91%

“…The AB condition shows a Si solute concentration ranging from 2.0 to 2.7 wt%, thus exceeding the maximum equilibrium Si solid solubility in Al (1.65 wt%). Zhao et al 34 and Maeshima et al 30 report similar Si solute concentration (2.2 at%) based on STEM-EDX. The Si solute concentrations measured from ER and STEM-EDX confirm that the rapid cooling (10 4 –10 6 K/s) induces a significant enhancement of the Si solid solubility in LPBF-processed AlSi10Mg.…”

Section: Discussionmentioning

confidence: 76%

“…Namely, a high degree of Si supersaturation (2.7 wt%) is observed in the primary Al cells based on these STEM-EDX measurements (Table 3 ), thus exceeding the maximum Si equilibrium solubility (1.65 wt%) at the eutectic temperature. Likewise, Zhao et al performed local STEM-EDX measurements on as-built LPBF-processed AlSi10Mg and reported a similar Si solute content (2.2 at%) in the primary Al cell 34 . Besides the degree of supersaturation, this work shows that the predicted solidification trajectory seems to be retained under rapid solidification conditions.…”

Section: Discussionmentioning

confidence: 87%

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Unravelling the multi-scale structure–property relationship of laser powder bed fusion processed and heat-treated AlSi10Mg

Cauwenbergh

Samaee

Thijs

et al. 2021

Sci Rep

129

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Tailoring heat treatments for Laser Powder Bed Fusion (LPBF) processed materials is critical to ensure superior and repeatable material properties for high-end applications. This tailoring requires in-depth understanding of the LPBF-processed material. Therefore, the current study aims at unravelling the threefold interrelationship between the process (LPBF and heat treatment), the microstructure at different scales (macro-, meso-, micro-, and nano-scale), and the macroscopic material properties of AlSi10Mg. A similar solidification trajectory applies at different length scales when comparing the solidification of AlSi10Mg, ranging from mould-casting to rapid solidification (LPBF). The similarity in solidification trajectories triggers the reason why the Brody-Flemings cellular microsegregation solidification model could predict the cellular morphology of the LPBF as-printed microstructure. Where rapid solidification occurs at a much finer scale, the LPBF microstructure exhibits a significant grain refinement and a high degree of silicon (Si) supersaturation. This study has identified the grain refinement and Si supersaturation as critical assets of the as-printed microstructure, playing a vital role in achieving superior mechanical and thermal properties during heat treatment. Next, an electrical conductivity model could accurately predict the Si solute concentration in LPBF-processed and heat-treated AlSi10Mg and allows understanding the microstructural evolution during heat treatment. The LPBF-processed and heat-treated AlSi10Mg conditions (as-built (AB), direct-aged (DA), stress-relieved (SR), preheated (PH)) show an interesting range of superior mechanical properties (tensile strength: 300–450 MPa, elongation: 4–13%) compared to the mould-cast T6 reference condition.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 87%

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Unravelling the multi-scale structure–property relationship of laser powder bed fusion processed and heat-treated AlSi10Mg

Cauwenbergh

Samaee

Thijs

et al. 2021

Sci Rep

129

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“…The HAZ of the clad 316 L + WC composite exhibits a cellular‐dendritic‐reinforced microstructure (Figure 3a) with a coarse carbide network, [ 20,22,23 ] composed of gray eutectic carbides and white rod‐like carbides. [ 24 ] Gray eutectic carbides in the HAZ appear of larger size in comparison to the gray carbides observed around the WC reinforcements inside the MP (Figure 1c), whereas the white rod‐like carbides appear of smaller size (Figure 3b).…”

Section: Resultsmentioning

confidence: 99%

“…[17] The microstructure within the melt pool (MP) will be differentiated from the microstructure present in the HAZ, as the latter is known to strongly influence mechanical properties. [20][21][22][23] 2. Results…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Thermal Characterization of 316L + WC Composite Coatings Obtained by Laser Cladding

et al. 2020

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Herein, a metal matrix composite (MMC) composed of 316L stainless steel and 20% in volume of tungsten carbides (WC), fabricated by laser cladding (LC) is considered. LC is an additive manufacturing technique, characterized by ultrafast cooling rates and limited diffusion, thus giving rise to out-of-equilibrium microstructures. The microstructure of the MMC is found to consist of partially dissolved WC well distributed in an austenitic matrix reinforced by a network of reaction carbides. Those mixed reaction carbides are formed from a liquid enriched in W and C due to the dissolution of the original WC in contact with the molten metal during deposition. Distribution, chemical composition, crystallographic features, and stability of the different phases are characterized in details by combining electron microscopy, electron backscattered diffraction, and dilatometry. This combination of techniques allows to distinguish among M 6 C, M 23 C 6 , M 4 C, and WC 1-x carbide, belonging to the FeW -C system and all exhibiting a face-centered cubic lattice. Moreover, results of reverse thermal analyses are considered together with microstructural data to elucidate the genesis of this complex microstructure, differentiating the phases formed in the melt pool, in the vicinity of partially dissolved WC and in the heat-affected zone between two successive tracks.

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Microstructures of Metallic Materials from Additive Manufacturing

COLIN

2023

Additive Manufacturing of Metal Alloys 2

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Damage mechanisms in selective laser melted AlSi10Mg under as built and different post-treatment conditions

Cited by 109 publications

References 33 publications

Unravelling the multi-scale structure–property relationship of laser powder bed fusion processed and heat-treated AlSi10Mg

Unravelling the multi-scale structure–property relationship of laser powder bed fusion processed and heat-treated AlSi10Mg

Microstructural and Thermal Characterization of 316L + WC Composite Coatings Obtained by Laser Cladding

Microstructures of Metallic Materials from Additive Manufacturing

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