The effect of atmosphere on the structure and properties of a selective laser melted Al–12Si alloy

Wang, X J; Zhang, Lai-Chang; Fang, Minghao; Sercombe, T.B.

doi:10.1016/j.msea.2014.01.012

Cited by 225 publications

(102 citation statements)

References 37 publications

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“…The major concerns arising from this are the significantly high absorption of laser energy on the sintering/melt pool and the liquid-metal surface tension which increases the wetting angle between the solid and liquid phases that can inhibit inter-particulate bonding/melting between rastered lines and individual layers [38,105]. Therefore, the use of controlled atmosphere during SLS/SLM processing of aluminium alloys is very important because it prevents undesirable reactions, sweeps deleterious reaction products from the sintering chamber, initiates desirable reactions as demonstrated in the use of nitrogen atmosphere to form AlN (aluminium nitride) which improves the dimensional stability of sintered aluminium parts, and reduces oxide present on the metal surfaces as exemplified in iron through dissociated ammonia [106].…”

Section: 23: Effects Of Sls/slm Atmospheres On the Densification Mmentioning

confidence: 99%

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

Olakanmi

Mullis

Dalgarno

2015

Progress in Materials Science

1,404

526

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Section: 23: Effects Of Sls/slm Atmospheres On the Densification Mmentioning

confidence: 99%

“…Recently, SLS/SLM processing of aluminium alloy powders and their composites [24,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]45] has been undertaken with a view to gaining an understanding of laser processability.…”

Section: Introductionmentioning

confidence: 99%

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

Olakanmi

Mullis

Dalgarno

2015

Progress in Materials Science

1,404

526

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“…• Al-Si alloys: Due to their attractive combination of low weight, high heat conductivity and mechanical properties, Al-Si alloys (AlSi10Mg [151][152][153][154][155][156][157] and Al-12Si [158,159]) have wide applications in aerospace, automotive industries as heat exchangers. AlSi10Mg and Al-12Si are hypoeutectic alloys whose mechanical properties are largely dependant on the morphology of eutectic silicon.…”

Section: Materials Manufactured With Slmmentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

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Linköping 2018Cover image: A fracture surface of EBM IN718 after tensile test at room temperature.During the course of research underlying this thesis, Dunyong Deng was enrolled in Agora Materiae, a multidiciplinary doctoral program at Linköping University, Sweden. Printed by LiU-Tryck 2018 © Dunyong Deng AbstractAdditive manufacturing (AM), also known as 3D printing, has gained significant interest in aerospace, energy, automotive and medical industries due to its capabilities of manufacturing components that are either prohibitively costly or impossible to manufacture by conventional processes. Among the various additive manufacturing processes for metallic components, electron beam melting (EBM) and selective laser melting (SLM) are two of the most widely used powder bed based processes, and have shown great potential for manufacturing high-end critical components, such as turbine blades and customized medical implants. The futures of the EBM and SLM are doubtlessly promising, but to fully realize their potentials there are still many challenges to overcome.Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties and low cost. Though IN718 is being mostly used as a turbine disk material now, the initial introduction of IN718 was to overcome the poor weldability of superalloys in 1960s, since sluggish precipitation of strengthening phases γ ′ /γ ′′ enables good resistance to strain-age cracking during welding or post weld heat treatment. Given the similarity between AM and welding processes, IN718 has been widely applied to the metallic AM field to facilitate the understandings of process-microstructure-property relationships.The work presented in this licentiate thesis aims to better understand microstructures and mechanical properties EBM and SLM IN718, which have not been systematically investigated. Microstructures of EBM and SLM IN718 have been characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and correlated with the process conditions. Monotonic mechanical properties (e.g., Vickers microhardness and tensile properties) have also been measured and rationalized with regards to the microstructure evolutions before and after heat treatments.For EBM IN718, the results show the microstructure is not homogeneous but dependant on the location in the components, and the anisotropic mechanical properties are probably attributed to alignment of porosities rather than texture.iii Post heat treatment can slightly increase the mechanical strength compared to the as-manufactured condition but does not alter the anisotropy. SLM IN718 shows significantly different microstructure and mechanical properties to EBM IN718. The as-manufactured SLM IN718 has very fine dendritic microstructure and Laves phases in the interdendrites, and is "work-hardened" by the residual strains and dislocations present in the material. Mechanical properties are different between horizontally and vertically built samples, and heat treatment can m...

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“…Selective laser melting (SLM) is an AM technology for the production of metal parts from powders using a high intensity infra-red laser [1,2]. Several researchers are interested in material qualification studies for Al alloys in this field [3,4], and there are numerous studies paying special attention to the mechanical properties of parts manufactured from Al alloys by SLM such as hardness [5,6], tensile behavior [4,[6][7][8][9], creep resistance [4], impact energy [6], and fatigue [10]. In most of these studies a heat treatment has been employed with the aim of enhancing the mechanical behavior of the parts.…”

mentioning

confidence: 99%

On the Precipitation Hardening of Selective Laser Melted AlSi10Mg

Aboulkhair

Tuck

Ashcroft

et al. 2015

Metall Mater Trans A

243

105

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Precipitation hardening of selective laser melted AlSi10Mg was investigated in terms of solution heat treatment and aging duration. The influence on the microstructure and hardness was established, as was the effect on the size and density of Si particles. Although the hardness changes according to the treatment duration, the maximum hardening effect falls short of the hardness of the as-built parts with their characteristic fine microstructure. This is due to the difference in strengthening mechanisms.

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The effect of atmosphere on the structure and properties of a selective laser melted Al–12Si alloy

Cited by 225 publications

References 37 publications

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

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

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

On the Precipitation Hardening of Selective Laser Melted AlSi10Mg

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