Influence of Process Parameters on the Quality of Aluminium Alloy EN AW 7075 Using Selective Laser Melting (SLM)

Kaufmann, Niko; Imran, Muhammad�; Wischeropp, Tim Marten; Emmelmann, Claus; Siddique, Shafaqat; Walther, Frank

doi:10.1016/j.phpro.2016.08.096

Cited by 218 publications

(63 citation statements)

References 4 publications

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“…One important building parameter is the building platform temperature which has an important effect on the microstructure and mechanical properties of LPBF parts [21][22][23]. In fact, most of the published studies used the platform heating mainly to reduce residual stresses in the part [21,24].…”

Section: Introductionmentioning

confidence: 99%

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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%

“…In fact, most of the published studies used the platform heating mainly to reduce residual stresses in the part [21,24]. However, it was pointed out that the platform heating also has an important role on the LPBF consolidation phenomena and the microstructure evolution of the processed materials [23].…”

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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“…Metal additive manufacturing (AM) is a promising technology for complex and netshape prototyping and production, with minimal waste generation [1][2][3][4][5]. With the prospect of net shape production of high strength aluminium (Al) alloys [6][7][8][9][10][11][12], the interest in AM technology to produce components from high strength 7xxx series (Al-Zn-Mg(-Cu)) Al-alloys is increasing [6,[13][14][15][16][17][18]. To date, the microstructural evolution and corrosion behaviour of AM prepared 7xxx series Al-alloys have not been studied and hence not understood in contrast to wrought 7xxx series Al-alloys presently used in aerospace applications.…”

Section: Introductionmentioning

confidence: 99%

“…To date, studies on the microstructure and mechanical properties of SLMed 7xxx Alalloys are limited [6,[13][14][15][16][17][18], and in the context of corrosion, no prior studies exist to date. A recent study discovered the predominant presence of a nanometre scale icosahedral quasicrystalline particle, termed -phase [13].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and corrosion evolution of additively manufactured aluminium alloy AA7075 as a function of ageing

Gharbi

Kairy

et al. 2019

npj Mater Degrad

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Additively manufactured high strength aluminium (Al) alloy AA7075 was prepared using selective laser melting (SLM). High strength Al-alloys prepared by SLM have not been widely studied to date. The evolution of microstructure and hardness, with the attendant corrosion, were investigated. Additively manufactured AA7075 was investigated both in the "as-produced" condition and as a function of artificial ageing. The microstructure of specimens prepared was studied using electron microscopy.Production of AA7075 by SLM generated a unique microstructure, which was altered by solutionising and further altered by artificial ageingresulting in microstructures distinctive to that of wrought AA7075-T6. The electrochemical response of additively manufactured AA7075 was dependent on processing history, and unique to wrought AA7075-T6, whereby dissolution rates were generally lower for additively manufactured AA7075. Furthermore, immersion exposure testing followed by microscopy, indicated different corrosion morphology for additively manufactured AA7075, whereby resultant pit size was notably smaller, in contrast to wrought AA7075-T6.

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“…These alloys offer high tensile strengths of up to 500 MPa with a low elongation at break of 5% [5][6][7].Many known alloys are difficult to process by laser powder bed fusion due to the formation of pores and cracks during solidification. These include medium and high strength wrought alloys of the alloy systems AlCu (EN AW-2xxx) [8][9][10], AlMgSi (EN AW-6xxx) [11,12], and AlZnMg (EN AW-7xxx) [13][14][15]. Known structural concepts for the development of alloys that are adapted to the additive manufacturing process use rare earth elements, such as scandium and zirconium, with varying content [16][17][18] or feature the addition of nanoscale grain refining additives to the known wrought alloys, such as the alloy EN AW-7075 [19].…”

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confidence: 99%

A Tailored AlSiMg Alloy for Laser Powder Bed Fusion

Knoop

Lutz

Mais³

et al. 2020

Metals

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The majority of aluminum alloys used for laser powder bed fusion are based on the aluminum-silicon system, particularly alloys containing 7 to 12 wt.% silicon and less than 1 wt.% magnesium. Silicon has a beneficial influence on melt viscosity during casting and laser additive manufacturing and prevents the formation of cracks. This study focused on the development of a new AlSi3.5Mg2.5 alloy for laser powder bed fusion with a Mg-Si content above 1.85 wt.% Mg 2 Si, which is the solubility limit of the α-aluminum matrix, and a subsequent heat treatment to adjust the mechanical properties with a wide range of strength and ductility values. The characterization of the microstructure was conducted by optical microscopy, scanning electron microscopy, transmission electron microscopy, and differential scanning calorimetry. The mechanical properties were determined by tensile tests and additional tight radius bending tests. The newly developed alloy was compared with AlSi10Mg and Scalmalloy ® . AlSi3.5Mg2.5 offers higher strength and ductility than AlSi10Mg, at comparable material costs. The mechanical properties can be adjusted in a wide range of values using a single step heat treatment. After direct ageing, the samples exhibited a ultimate tensile strength (UTS) of 484 ± 1 MPa and an elongation at break of 10.5% ± 1.3%, while after soft annealing, they exhibited a UTS of 179 ± 2 MPa and an elongation at break of 25.6% ± 0.9%.Metals 2020, 10, 514 2 of 13 coarsen [1,2]. Currently, there are only a few alternative processable aluminum alloys for additive manufacturing. These include casting alloys like AlSiCu alloys (EN AC-46xxx and EN AC-47xxx). These alloys offer high tensile strengths of up to 500 MPa with a low elongation at break of 5% [5][6][7].Many known alloys are difficult to process by laser powder bed fusion due to the formation of pores and cracks during solidification. These include medium and high strength wrought alloys of the alloy systems AlCu (EN AW-2xxx) [8][9][10], AlMgSi (EN AW-6xxx) [11,12], and AlZnMg (EN AW-7xxx) [13][14][15]. Known structural concepts for the development of alloys that are adapted to the additive manufacturing process use rare earth elements, such as scandium and zirconium, with varying content [16][17][18] or feature the addition of nanoscale grain refining additives to the known wrought alloys, such as the alloy EN AW-7075 [19]. When processed by laser additive manufacturing, both approaches lead to a combination with a high strength above 500 MPa combined with a good elongation at break of up to 15%. The disadvantages of these approaches are the high costs of scandium and the application of nanoparticles. A more detailed review of investigations into aluminum alloys for the LPBF process can be found in [20,21].The use of EN AW-6xxx alloys, whose strength is based on precipitation hardening, promises medium strength with a smaller decrease in ductility at low material costs. Artificial ageing leads to the formation of magnesium/silicon precipitates, which hinder dislocation mo...

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Influence of Process Parameters on the Quality of Aluminium Alloy EN AW 7075 Using Selective Laser Melting (SLM)

Cited by 218 publications

References 4 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

Microstructure and corrosion evolution of additively manufactured aluminium alloy AA7075 as a function of ageing

A Tailored AlSiMg Alloy for Laser Powder Bed Fusion

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