Research on Microstructure and Properties of AlSi10Mg Fabricated by Selective Laser Melting

Pan, Wei; Ye, Zhanggen; Zhang, Yongzhong; Liu, Yantao; Liang, Bo; Zhai, Ziyu

doi:10.3390/ma15072528

Cited by 8 publications

(13 citation statements)

References 36 publications

(33 reference statements)

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“…A large number of spherical pores are observed in the sample fabricated with a low scanning speed (e.g., v = 400 mm/s, sample V1). The large pores are considered keyhole porosities, which have been reported frequently in L-PBF fabricated metallic materials [ 44 , 45 , 46 ]. The keyhole pore is filled with metal vapor and shielding gas because the recoil pressure of the metal vapor pushes the surface toward the bulk metal.…”

Section: Resultsmentioning

confidence: 99%

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

Jiang

et al. 2022

Materials

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Besides the unique shape memory effect and superelasticity, NiTi alloys also show excellent damping properties. However, the high damping effect is highly temperature-dependent, and only exists during cooling or heating over the temperature range where martensitic transformation occurs. As a result, expanding the temperature range of martensite transformation is an effective approach to widen the working temperature window with high damping performance. In this work, layer-structured functionally graded NiTi alloys were produced by laser powder bed fusion (L-PBF) alternating two or three sets of process parameters. The transformation behavior shows that austenite transforms gradually into martensite over a wide temperature range during cooling, and multiple transformation peaks are observed. A microstructure composed of alternating layers of B2/B19′ phases is obtained at room temperature. The functionally graded sample shows high damping performance over a wide temperature range of up to 70 K, which originates from the gradual formation of the martensite phase during cooling. This work proves the potential of L-PBF to create NiTi alloys with high damping properties over a wide temperature range for damping applications.

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Section: Resultsmentioning

confidence: 99%

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

Jiang

et al. 2022

Materials

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“…In general, a review of the gathered room temperature mechanical properties shows good agreement with literature data for similar processing conditions. For thermal treatments of 2 h at temperatures between 275 and 300 °C, the overview in Appendix A relates UTS values between 247 and 345 MPa, yield strengths extending from 152.7 to 198 MPa and, in declining order, elongation at failure between 23.5% and 6.5% [ 14 , 21 , 22 , 32 , 36 ]. Note, though, that in all these cases, the build platform temperature was either given as ranging between RT and 80 °C, or not related at all, and further boundary conditions such as polar and azimuth angle or scanning parameters varied.…”

Section: Discussionmentioning

confidence: 99%

“…Pan et al detected initial, though only very slight, signs of cellular network degradation already after 2 h of treatment at slightly lower temperatures of 275 °C. The fact that the cell size is approximately 500 nm suggests high cooling rates, as would be expected from a build platform kept at room temperature [ 36 ]. Zhang et al compared the microstructures and mechanical properties of AlSi10Mg samples annealed for 2 h at 260, 280, 300 and 320 °C.…”

Section: Discussionmentioning

confidence: 99%

“… Overview of room temperature properties of AlSi10Mg produced via the LPBF process as reported in the scientific literature [ 16 , 18 , 21 , 22 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]: ( a ) ultimate tensile strength (UTS) plotted vs. yield strength (YS), and ( b ) elongation at failure plotted vs. UTS. The data cover different printing directions, process parameters and heat treatment states, namely as-built (AB), stress-relieved (SR), solution heat-treated (SHT) and warm-aged (WA), plus combinations of these.…”

Section: Figurementioning

confidence: 99%

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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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“…Computer numerical control machining (CNC) was used to machine the surface roughness (Ra) to about 1.6 µm. It is known that the aging treatment is a process to improve mechanical properties and reduce the residual stress of workpieces [13]. Therefore, the aging treatment was applied at the temperature of 130 • C with a dwell time of 4 h [14].…”

Section: Preprocessing For Mirror Blank Stabilizationmentioning

confidence: 99%

Design and Fabrication of Extremely Lightweight Truss-Structured Metal Mirrors

Liu

Zhang³

et al. 2022

Materials

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Three-dimensional printing, also called additive manufacturing (AM), offers a new vision for optical components in terms of weight reduction and strength improvement. A truss, which is a triangulated system of members that are structured and connected in such a way that they mainly bear axial force, is commonly used in steel structures to improve stiffness and reduce weight. Combining these two technologies, an extremely lightweight truss-structured mirror was proposed. First, the finite element analyses (FEA) on surface shape deviation and modal properties were carried out. Results showed that the mirrors had sufficient stiffness and a high weight reduction of up to 85%. In order to verify their performance, the truss-structured mirror blanks were fabricated with AM technology. After that, both the preprocessing and the postprocessing of the mirrors were carried out. The results show that without NiP coating, a surface shape deviation of 0.353λ (PV) and 0.028 λ (RMS) (λ = 632.8 nm) with a roughness of Ra 2.8 nm, could be achieved. Therefore, the truss-structured mirrors in this study have the characteristics of being extremely lightweight and having improved stiffness as well as strong temperature stability.

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Research on Microstructure and Properties of AlSi10Mg Fabricated by Selective Laser Melting

Cited by 8 publications

References 36 publications

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

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

Design and Fabrication of Extremely Lightweight Truss-Structured Metal Mirrors

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