Influence on microstructure, strength and ductility of build platform temperature during laser powder bed fusion of AlSi10Mg

Macías, Juan Guillermo Santos; Douillard, Thierry; Zhao, Lv; Maire, Éric; Pyka, Grzegorz; Simar, Aude

doi:10.1016/j.actamat.2020.10.001

Cited by 130 publications

(42 citation statements)

References 41 publications

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“…The large Si particle size within the TMAZ reduces the influence of the matrix on the Si measurement, as proved by Pöhl et al [59]. The value obtained by applying the procedure described in hereabove is E = 167 GPa, which is consistent with the literature [73]. For the α-Al matrix, the Young's modulus used within this research was obtained based on an initial Berkovich grid indentation campaign [23] performed in 2021 on the post-processed samples (5mm thick) of the AlSi10Mg-FSP material provided by Catholic University of Louvain [5].…”

Section: Si and α-Al Elastic Parameterssupporting

confidence: 88%

Identification of a soft matrix-hard inclusion material by indentation

Tran

Bouffioux

Dedry

et al. 2022

International Journal of Mechanical Sciences

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Section: Si and α-Al Elastic Parameterssupporting

confidence: 88%

Identification of a soft matrix-hard inclusion material by indentation

Tran

Bouffioux

Dedry

et al. 2022

International Journal of Mechanical Sciences

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“…The heat-affected zone (HAZ) follows further below and marks the region in which thermal energy input through the passing laser is still high enough to afford diffusion- and precipitation-based microstructural change, specifically in silicon phases both in the eutectic and precipitated from the aluminum solid solution. Both FMP and CMP zones are characterized by a 3D network or cellular structure of eutectic phase surrounding the aluminum grains [ 33 , 49 , 50 , 51 ]. Due to the high cooling rates typical of the LPBF process [ 52 ], the latter are not in equilibrium state, but represent a supersaturated solid solution [ 20 ].…”

Section: Discussionmentioning

confidence: 99%

“…The degree of supersaturation, i.e., the amount of elements solved, is controlled by the actual cooling rate and thus decreases with the increasing build platform temperature. Cell sizes also mainly depend on factors affecting the cooling rate and range roughly between 0.5 and a few µm [ 15 , 49 ].…”

Section: Discussionmentioning

confidence: 99%

High-Temperature Mechanical Properties of Stress-Relieved AlSi10Mg Produced via Laser Powder Bed Fusion Additive Manufacturing

et al. 2022

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The present study is dedicated to the evaluation of the mechanical properties of an additively manufactured (AM) aluminum alloy and their dependence on temperature and build orientation. Tensile test samples were produced from a standard AlSi10Mg alloy by means of the Laser Powder Bed Fusion (LPBF) or Laser Beam Melting (LBM) process at polar angles of 0°, 45° and 90°. Prior to testing, samples were stress-relieved on the build platform for 2 h at 350 °C. Tensile tests were performed at four temperature levels (room temperature (RT), 125, 250 and 450 °C). Results are compared to previously published data on AM materials with and without comparable heat treatment. To foster a deeper understanding of the obtained results, fracture surfaces were analyzed, and metallographic sections were prepared for microstructural evaluation and for additional hardness measurements. The study confirms the expected significant reduction of strength at elevated temperatures and specifically above 250 °C: Ultimate tensile strength (UTS) was found to be 280.2 MPa at RT, 162.8 MPa at 250 °C and 34.4 MPa at 450 °C for a polar angle of 0°. In parallel, elongation at failure increased from 6.4% via 15.6% to 26.5%. The influence of building orientation is clearly dominated by the temperature effect, with UTS values at RT for polar angles of 0° (vertical), 45° and 90° (horizontal) reaching 280.2, 272.0 and 265.9 MPa, respectively, which corresponds to a 5.1% deviation. The comparatively low room temperature strength of roughly 280 MPa is associated with stress relieving and agrees well with data from the literature. However, the complete breakdown of the cellular microstructure reported in other studies for treatments at similar or slightly lower temperatures is not fully confirmed by the metallographic investigations. The data provide a basis for the prediction of AM component response under the thermal and mechanical loads associated with high-pressure die casting (HPDC) and thus facilitate optimizing HPDC-based compound casting processes involving AM inserts.

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“…The visualization of submicron features such as Si particles is commonly performed via techniques such as nano-tomography [56] or focused ion beam (FIB) microscopy [57], but these techniques are limited to relatively small FoVs (e.g., cubic regions of ~200 μm per side) and do not allow statistically sound analyses. The potential of SXRR to detect the thermally-induced evolution of submicron (<5 μm) features over statistically relevant FoVs enabled two major findings: (i) the disintegration of the Si network and subsequent spheroidization is spatially homogeneous, i.e., no differences in the Si precipitation rate are observed along the building direction; and (ii) the porosity growth (mostly Type II) is, on the other hand, spatially heterogenous and most likely favoured at melt pool boundaries.…”

Section: Discussionmentioning

confidence: 99%