Aging Behavior of High-Strength Al Alloy 2618 Produced by Selective Laser Melting

Casati, Riccardo; Lemke, Jannis Nicolas; Alarcon, Adrianni Zanatta; Vedani, Maurizio

doi:10.1007/s11661-016-3883-y

Cited by 37 publications

(15 citation statements)

References 23 publications

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“…This result is in full agreement with the observations derived from the DSC results, which show an intense exothermic peak related to the formation of β ” strengthening precipitates in the as built sample. They are also in agreement with previous experiments performed on different age‐hardenable materials that showed a good response to aging in the as built state . In addition, the drop of hardness induced by natural pre‐aging (i.e., delayed aging effect) is noticeable and in agreement with previous experiments performed on similar alloys produced by casting …”

Section: Resultssupporting

confidence: 92%

Aging Response of an A357 Al Alloy Processed by Selective Laser Melting

Casati

Vedani

2018

Adv Eng Mater

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The A357 Al-Si-Mg alloy produced by selective laser melting is investigated in order to evaluate its response to thermal aging. Solution annealing followed by water quenching reveals responsible for the transformation of the interconnected Si network, typical of the as built material, into a dispersion of globular, and coarser constituent and for the formation of an equiaxed grain structure. The microstructural changes lead to a reduction of material hardness. DSC and aging curves show that as built condition can be considered as fully appropriate for an effective dispersion strengthening process by artificial aging. Natural aging reduces the amount of available sites for heterogeneous nucleation of β" phase and it is considered as detrimental for tensile properties.

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Section: Resultssupporting

confidence: 92%

Aging Response of an A357 Al Alloy Processed by Selective Laser Melting

Casati

Vedani

2018

Adv Eng Mater

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“…Few data are available concerning the effect of a T6 heat treatment on the microstructure and mechanical properties of LBM heat treatable 2xxx or 7xxx series Al alloys, or generally of LC Al alloys. In contrast with Al–Si alloys that exhibit a loss in strength and/or hardness after treatment, T6 heat treatment of LBM AA2219 and AA2618 results in a significant strengthening, and a similar trend is reported for an Al–9 wt% Zn–2.3 wt% Mg–1.5 wt% Cu alloy . Besides, it is also noteworthy that the aging response of a LC Al–0.9 wt% Sc alloy varies as a function of the position inside the deposit, thus reflecting the influence of local variations in the thermal history on the as‐built microstructure (see Section 3.2) …”

Section: Post‐processingmentioning

confidence: 52%

“…Al–Cu (2xxx series) alloys have been fabricated successfully by LBM of pre‐alloyed powders, in spite of a certain tendency of these alloys for solidification cracking due to the segregation of Cu‐rich compounds during solidification . AA2219 and AA2139 have been processed by wire‐feed EBM .…”

Section: Aluminum Alloys For Ammentioning

confidence: 99%

Fusion‐Based Additive Manufacturing for Processing Aluminum Alloys: State‐of‐the‐Art and Challenges

2017

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The fusion-based additive manufacturing of Al alloys has been developing at an ever faster pace since early 2015, after a comparatively slow start with respect to other metallic materials. This paper reviews the recent developments with the aim of identifying challenges and opportunities for future work. Additive Al components possess strongly out-of-equilibrium microstructures resulting in potentially enhanced mechanical properties. A deeper understanding of the thermal history during fabrication, the design of new high strength alloys and the development of better adapted post-processing procedures are still needed to take full advantages of the specificities of additive manufacturing.

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“…The microstructure of SLM produced aluminum alloy has changed remarkably with the increasing temperature during the heat treatment process [44,45,55]. Due to the rapid solidification process, Si is supersaturated in the Al matrix.…”

Section: In Heat Treated Statementioning

confidence: 99%

“…Hence, it is inevitable to use proper heat treatment method to relieve the residual stress. However, the microstructure is also changed after post heat treatment as well as the mechanical properties and the corrosion resistance [44,45].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviors of Selective Laser Melted Aluminum Alloys: A Review

Chen

Zhang

Jia

et al. 2020

Metals

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Selective laser melting (SLM) is an ideal method to directly fabricate products with high geometrical complexity. With low density and good corrosion resistance, aluminum alloys are widely used as important structural materials. Microstructures and mechanical properties of SLMed aluminum alloys have been recently widely studied. Corrosion behavior as a vital concern during the service of SLMed aluminum alloy parts has also drawn many attentions. Previous studies have found that SLM-processed aluminum alloys exhibit better corrosion resistance compared to the casted and wrought counterparts for both Al-Si alloys and high strength 2xxx Al alloys, which is mainly due to the unique microstructure features of SLMed Al alloys. For Al-Si alloys, with different shapes of Si networks, the different building planes show discrepant corrosion behaviors. Owing to the rougher surface with relatively larger numbers of defects, the as-printed surface is vulnerable to corrosion than the polished. Heat treatment has a negative effect on corrosion resistance due to the breakup of Si networks. The microstructure features correlated with the corrosion behaviors were also reviewed in this paper. Some suggestions on the future study of corrosion behaviors of SLMed Al alloys were put forward.

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Aging Behavior of High-Strength Al Alloy 2618 Produced by Selective Laser Melting

Cited by 37 publications

References 23 publications

Aging Response of an A357 Al Alloy Processed by Selective Laser Melting

Aging Response of an A357 Al Alloy Processed by Selective Laser Melting

Fusion‐Based Additive Manufacturing for Processing Aluminum Alloys: State‐of‐the‐Art and Challenges

Corrosion Behaviors of Selective Laser Melted Aluminum Alloys: A Review

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