Changing the alloy composition of Al7075 for better processability by selective laser melting

Montero-Sistiaga, Maria L.; Mertens, Raya; Vrancken, Bey; Wang, Xiebin; Hooreweder, Brecht Van; Kruth, Jean‐Pierre; Humbeeck, Jan Van

doi:10.1016/j.jmatprotec.2016.08.003

Cited by 455 publications

(157 citation statements)

References 20 publications

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“…[37,[111][112][113][114] Secondly, the scan speed has a noteworthy impact on the shape of the melt pool, with increasing scan speeds the melt pool width decreases, which requires to reduce hatch distances to account for it, while the melt pool length increases. References pure Al >99.5 [143] AlSi0.5 $100 [120] Al6061 (AlMg1SiCu) 96.5 [144] Al7075 (AlZn5.5MgCu) 95.1 [145] Al7075 þ 4 wt% Si 98.9 [145,146] A356 (AlSi7Mg0.3) 99.8 [147] A357 (AlSi7Mg0.6) 99.5 [148] A360 (AlSi9.5Mg0.5) 99.8 [146] AlSi10Mg 99.5 %100 [36,64,73,115,120,122,131,137,[149][150][151][152][153] AlSi25 %100 [120] AlMg3 %100 [120] AlSi9Cu3 99.5 [137] Al-3.5Cu-1.5Mg-1Si >98 [154] AlMgScZr (Scalmalloy) >99 %100 [100,116,137] AlSi10Mg reinforced with 5 wt% TiC 99.5 [155] AlSi10Mg reinforced with 1 wt% TiB 2 99.2 [152] AlSi10Mg reinforced with 10 wt% TiB 2 98 [152] AlSi10Mg reinforced with 0.5 wt% MgAl 2 O 4 99.3 [152] a) common relates to consistent results found in multiple publications. In addition to the complexity of determining a suitable set of fabrication parameters, various raw materials differ widely in their requirements and their absorptivity of the laser power, and their heat conductivity.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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Additive manufacturing has multiple advantages over conventional fabrication techniques, such as the geometrical freedom and, to a great extent, the omission of tooling equipment. Hence, futuristic designs and non-standard topology-optimized structures can be fabricated without causing noteworthy extra cost, since the geometrical complexity is, exaggeratedly spoken, for free. The manufacturing time and the amount of required raw material are the key criteria, which determine the expenses. What at first glance appears as an engineer's dream, introduces its complexity in the description of the material's characteristics and their volatility to the manufacturing conditions. Within this study, the main properties (i.e., surface hardness, tensile, and compression strength, as well as fracture toughness) and their anisotropic and inhomogeneous nature are addressed. Detailed overviews of the progress to date for aluminum, iron, titanium, cobalt, and nickel based raw materials are provided. Furthermore, an overview about the state-of-the-art in the medical sector is included, comprising the areas of utilization and several trail studies.

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Section: Mechanical Propertiesmentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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“…To put it in another way, SLM cannot be applied to those alloys, which suffer considerably from thermally induced cracks during the process, just by optimizing process parameters [174]. But instead, by optimizing the alloying element additions within the specification range, it has been demonstrated that the material's crack susceptibility can be reduced without compromising its mechanical properties [174,185]. Therefore, developing materials that are specifically for SLM process allows the wider applications of SLM.…”

Section: Selective Laser Meltingmentioning

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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“…[16][17][18][19] Moreover, physical properties of structural materials are mainly affected by the microstructure and the forming quality. In contrast, thermoelectric materials are semiconductors that usually possess a lower melting point, lower thermal conductivity, poor ductility and weak thermal shock resistance.…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification

Mao

Yan

et al. 2017

RSC Adv.

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Commercial production of thermoelectric (TE) modules features energy-intensive and time-consuming processes. Here, we propose a rapid, facile and low cost fabrication process for n-type single phase Bi 2 Te 2.7 Se 0.3 that combines self-propagating high-temperature synthesis (SHS) with the laser nonequilibrium 3D printing method based on selective laser melting (SLM). The optimal SLM processing window for high quality single layers has been determined. Results show that the chemical composition of the sample is very sensitive to the laser energy density (E V ) due to the selective vaporization of Se and Te. For energy densities E V of less than 33.3 J mm À3, the composition of the SLM-processed samples is relatively stable. However, as E V exceeds 33.3 J mm À3 and increases further, the vaporization rate of Te and Se significantly increases and is much higher than that of Bi. Empirical formulae relating the chemical composition of the resulting materials with the values of E V are obtained and are used to predict the composition of the SLM-processed material. Most importantly, the temperature dependent TE properties of the SLM-fabricated bulk sample result in a maximum ZT value of 0.84 at 400 K, which is comparable to that of the commercially available material. The work has laid a foundation for the future utilization of this technique for the fabrication of Bi 2 Te 3 -based thermoelectric modules.

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Changing the alloy composition of Al7075 for better processability by selective laser melting

Cited by 455 publications

References 20 publications

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification

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Changing the alloy composition of Al7075 for better processability by selective laser melting

Cited by 455 publications

References 20 publications

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Non-equilibrium synthesis and characterization of n-type Bi2Te2.7Se0.3 thermoelectric material prepared by rapid laser melting and solidification

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Product

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Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification