Mechanical properties of AlSi10Mg alloy fabricated by laser melting deposition and improvements via heat treatment

Lv, Fei; Shen, Lida; Liang, Huixin; Xie, Dexin; Wang, Changjiang; Tian, Zongjun

doi:10.1016/j.ijleo.2018.10.112

Cited by 49 publications

(23 citation statements)

References 29 publications

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“…The strength decreased greatly and the elongation increased significantly. In contrast to it, Lv et al (2019) found that T6 (525°C/2h 1 180°C/8h) heat treatment increased the tensile strength compared to as-built samples due to precipitation strengthening of the Mg 2 Si phase.…”

Section: Introductionmentioning

confidence: 69%

Effect of direct aging and annealing on the microstructure and mechanical properties of AlSi10Mg fabricated by selective laser melting

Xiao

Zhang

Zhu

2022

RPJ

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Purpose This paper aims to systematically investigate the effect of the heat treatment process parameters on the microstructure and mechanical properties of the selective laser melting (SLM) AlSi10Mg alloy. Design/methodology/approach The samples with very low porosity were fabricated with optimized processing parameters on a self-developed SLM system. The heat treatment of using the temperature of 170°C∼400°C and the holding time of 0.5∼12 h was studied, and the evolution of the microstructure and mechanical properties of AlSi10Mg alloy under direct aging and annealing was investigated and obtained. Findings After annealing above 300°C for 1 h, the dendrite Si in the sample occurs spheroidization, and the molten pool contour becomes blurred or even disappeared completely, but low-temperature heat treatment does not change the morphology and size of grains significantly. Except for holding at 200°C for 1 h, all other heat treatment processes cause the tensile and yield strengths of SLM AlSi10Mg alloys to decrease and the elongation to increase. When the annealing temperature is higher than 200°C, the higher the temperature and the longer the holding time, the more obvious this effect is. Originality/value The correlation between the mechanical properties and microstructure of SLM AlSi10Mg alloy under different conditions was obtained. According to the characteristics of SLM forming, the direct aging and annealing process are mainly studied, which provided new information for the heat treatment of SLM AlSi10Mg alloy and promoted the engineering application of SLM AlSi10Mg alloy.

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Section: Introductionmentioning

confidence: 69%

Effect of direct aging and annealing on the microstructure and mechanical properties of AlSi10Mg fabricated by selective laser melting

Xiao

Zhang

Zhu

2022

RPJ

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“…However, no group of samples was able to excel at all tested aspects at once, indicating that parameters and strategies must be selected based on the objectives of the final results. In a broad sense, the following can be stated:  continuous pattern strategies seem to generate less denser parts, this is mainly due to the incorporation of defects such as lack of fusion/pores, associated with this strategy [66];  all samples weighted below the theoretical weight, mainly due to the inclusion of pores by a lack of fusion;  chessboard and stripes 67° pattern strategies seem to promote the best overall results, as the samples produced by these strategies are always among the best three in the tested categories;  residual stress is higher on vertical faces than horizontal faces;  the use of chessboard strategies along with build support structures generated the lowest residual stress values;  Ra surface roughness ranges between 8-12 µ m, being equivalent to certain machined surfaces (originating from sawing, drilling, milling and turning processes), casted surfaces and forged surfaces;  build orientation does not influence surface hardness; Takata, et al [79], Fiocchi, Tuissi, Bassani and Biffi [42] and Lv, et al [80] are examples of authors that have researched into the heat treatability of AlSi10Mg alloys, having observed that heat treatments in the 300 • C temperature range, or higher, lead to Si particle segregation from the supersaturated matrix in uniformly distributed manner throughout the α-Al matrix, as seen in Figure 6b, in the form a granular small particles. Also, a fading of layer and melt pool tracks begins to occur, generating a more uniform structure and mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

“…The HAZ area was exposed to lower temperatures, simulating a heat treatment, allowing for the formation and growth of Si particles [30,78]. Takata, et al [79], Fiocchi, Tuissi, Bassani and Biffi [42] and Lv, et al [80] are examples of authors that have researched into the heat treatability of AlSi10Mg alloys, having observed that heat treatments in the 300 °C temperature range, or higher, lead to Si particle segregation from the supersaturated matrix in uniformly distributed manner throughout the α-Al matrix, as seen in Figure 6b, in the form a granular small particles. Also, a fading of layer and melt pool tracks begins to occur, generating a more uniform structure and mechanical properties.…”

Section: Microstructurementioning

confidence: 99%

Effect of Scan Strategies and Use of Support Structures on Surface Quality and Hardness of L-PBF AlSi10Mg Parts

et al. 2020

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Additive manufacturing allows for a great degree of design freedom and is rapidly becoming a mainstream manufacturing process. However, as in all manufacturing processes, it has its limitations and specificities. Equipping engineers with this knowledge allows for a higher degree of optimization, extracting the most out of this technology. Therefore, a specific part design was devised and created via L-PBF (Laser Powder Bed Fusion) using AlSi10Mg powder. Certain parameters were varied to identify the influence on material density, hardness, roughness, residual stress and microstructures. It was found that on heat treated parts laser pattern strategy is one of the most influential aspects, showing that chessboard and stripes 67° improved outcome; average Ra roughness varied between 8–12 µm, residual stress was higher on vertical surfaces than horizontal surfaces, with the combination of support structures and stripes 67° strategies generating the lowest residual stress (205 MPa on a lateral/vertical face), hardness was non-orientation dependent and larger on samples with chessboard fabrication strategies, while microstructures were composed of α–Al dendrites surrounded by Si particles. The distribution and grain size of the microstructure is dependent on location regarding melt pool and HAZ area. Furthermore, Al–Mg oxides were encountered on the surface, along with pores generating from lack of fusion.

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“…-17 [58] 330 [59] -7000 [60] 0.3 [59] -8.6 [61] 0.3 [57] -3 [60] 1 [ 62] -59 [63] Within range: [59][60][61][62][63][64][65][66][67] Within range: [57,58,[61][62][63][64][65][66][67] Within range: [57, 60, 62-64, 66, 67] Within range: [58,61,65] Within range: [57][58][59][60][61][62][64][65][66][67] Aluminium 6 [68] -16 [69] 120 [70] -3600 [68] 0.6 [71] -3.5 [68] 0.5 [68] 0.66 [70] -23.2 [72] Within range: …”

Section: [57]mentioning

confidence: 99%

Large-scale metal additive manufacturing: a holistic review of the state of the art and challenges

Lehmann

Rose

Ranjbar

et al. 2021

International Materials Reviews

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Additive Manufacturing (AM) has the potential to completely reshape the manufacturing space by removing the geometrical constraints of commercial manufacturing and reducing component lead time, especially for large-scale parts. Coupling robotic systems with direct energy deposition (DED) additive manufacturing techniques allow for support-free printing of parts where part sizes are scalable from sub-metre to multi-metre sizes. This paper offers a holistic review of large-scale robotic additive manufacturing, beginning with an introduction to AM, followed by different DED techniques, the compatible materials and their typical as-built microstructures. Next, the multitude of robotic build platforms that extend the deposition from the standard 2.5 degrees of freedom (DOF) to 6 and 8 DOF is discussed. With this context, the decomposition and slicing of the computerized model will be described, and the challenges of planning the deposition trajectory will be discussed. The different modalities to monitor and control the deposition in an attempt to meet the geometrical and performance specifications are outlined and discussed. A wide range of metals and alloys have been reported and evaluated for large-scale AM parts. These include steels, Ti, Al, Mg, Cu, Ni, Co-Cr and W alloys. Different post-processing steps, including heat treatments, are discussed, along with their microstructures. This paper finally addresses the authors' perspective on the future of the field and the largest knowledge gaps that need to be filled before the commercial implementation of robotic AM.

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Mechanical properties of AlSi10Mg alloy fabricated by laser melting deposition and improvements via heat treatment

Abstract: Mechanical properties of AlSi10Mg alloy fabricated by laser melting deposition and improvements via heat treatment. Optik,

Cited by 49 publications

References 29 publications

Effect of direct aging and annealing on the microstructure and mechanical properties of AlSi10Mg fabricated by selective laser melting

Effect of direct aging and annealing on the microstructure and mechanical properties of AlSi10Mg fabricated by selective laser melting

Effect of Scan Strategies and Use of Support Structures on Surface Quality and Hardness of L-PBF AlSi10Mg Parts

Large-scale metal additive manufacturing: a holistic review of the state of the art and challenges

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