A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

Olakanmi, Eyitayo Olatunde; Mullis, Andrew M.; Dalgarno, Kenneth

doi:10.1016/j.pmatsci.2015.03.002

Cited by 1,430 publications

(599 citation statements)

References 164 publications

(392 reference statements)

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“…AM technologies are increasingly employed in the aerospace, automotive and medical fields thanks to the high level of design freedom and the interesting microstructures which can be obtained [1,2]. In fact, these processes allow the production of complex parts which would be difficult or impossible to produce with conventional processes and that would require several manufacturing steps and high material and energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

Aversa

Lorusso

Trevisan

et al. 2017

Metals

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A357 samples were realized by laser powder bed fusion (LPBF) on building platforms heated up to different temperatures. The effect of the preheating temperature and of the post processing heat treatment on the microstructure and the mechanical properties of the samples was studied. It was demonstrated that building platform heating can act as an in situ ageing heat treatment following the fast cooling that arises during laser scanning. A 17% higher ultimate tensile strength was achieved by the selection of the optimum building platform temperature. Moreover, the possibility to further increase the mechanical properties by means of a direct ageing heat treatment was investigated.

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Section: Introductionmentioning

confidence: 99%

Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

Aversa

Lorusso

Trevisan

et al. 2017

Metals

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“…In the last decade, selective laser melting and sintering (SLM/SLS) of metal powders evolved as one of the most promising tools for the fabrication of three-dimensional freeform elements with highly sophisticated geometries that cannot be processed with conventional machining methods or casting techniques [1,2]. Nowadays SLM is advanced to the serial production of customized products in a wide range of applications, especially in automotive, aerospace and medicine.…”

Section: Introductionmentioning

confidence: 99%

“…A hypereutectic Si content leads to a significant improvement of the ultimate tensile strength and elastic modulus and a decrease of the thermal expansion coefficient [3]. However, utilizing conventional techniques such as extrusion, forging, casting, powder metallurgy and continuous-wave laser (cw laser) treatment, the cooling rate is low, resulting in the formation of large primary silicon plates that deteriorate the mechanical and thermal properties [1,8]. At a mass fraction of 40 % silicon the liquidus temperature is 350 K above the eutectic temperature [7].…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting of hypereutectic Al-Si40-powder using ultra-short laser pulses

et al. 2017

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We investigate the use of ultra-short laser pulses for the selective melting of Al-Si40-powder to fabricate complex lightweight structures with wall sizes below 100 μm combined with higher tensile strength and lower thermal expansion coefficient in comparison to standard Al-Si alloys. During the cooling process using conventional techniques, large primary silicon particles are formed which impairs the mechanical and thermal properties. We demonstrate that these limitations can be overcome using ultra-short laser pulses enabling the rapid heating and cooling in a non-thermal equilibrium process. We analyze the morphology characteristics and micro-structures of single tracks and thin-walled structures depending on pulse energy, repetition rate and scanning velocity utilizing pulses with a duration of 500 fs at a wavelength of 1030 nm . The possibility to specifically change and optimize the microstructure is shown.

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“…Nowadays, the most important goal of manufacturing companies is delivering their customized productions at least time to gain more consumer markets [1][2][3][4]. Additive manufacturing (AM) is a convenient solution for the production of customized components with acceptable production time and cost [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In this process, the component which has lower melting temperature fuses and makes an adjoin between metal powders [19,20]. It is strongly emphasized that the accuracy of a part depends on careful selection of process parameters and unsuitable selection of process parameters will lead to part distortion, balling phenomena and dross formation [1,3,18,21,22]. The effective parameters of laser sintering can be divided into three general categories: process parameters, material parameters and environmental parameters [23].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of laser-assisted powder bed fusion of Fe-Cu powder mixture

Fatemi

Ashani

2017

Prog Addit Manuf

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Powder bed fusion is an additive manufacturing method which allows production of complex parts, in a shorter time compared to the conventional fabrication methods. During the last 60 years, Fe-Cu powders were widely used because of their anti-friction behavior and superior mechanical properties. Therefore, Fe-Cu powder has been selected as the basic material for the powder bed fusion process. In the present study, laser-assisted powder bed fusion of Fe-Cu powder mixture has been studied experimentally. Nd:YAG laser with a maximum power of 75 W has been used to melt the powder. The effects of volume fraction of the Cu powder in the mixture and applied energy density on thickness, surface concavity and geometrical accuracy of manufactured parts have been investigated. Results show that higher values of energy density lead to lower geometrical accuracy, higher thickness and surface concavity.

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A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

Cited by 1,430 publications

References 164 publications

Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

Selective laser melting of hypereutectic Al-Si40-powder using ultra-short laser pulses

Experimental investigation of laser-assisted powder bed fusion of Fe-Cu powder mixture

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