The relation between liquation and solidification cracks in pulsed laser welding of 2024 aluminium alloy

Ghaini, F. Malek; Sheikhi, Mohsen; Torkamany, M.J.; Sabbaghzadeh, J.

doi:10.1016/j.msea.2009.04.056

Cited by 116 publications

(39 citation statements)

References 8 publications

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“…The microstructure of the deposit cross-section is characterized by grains that have the same crystallographic orientation. The grains are columnar (parallel to the growth direction of the deposit) and nucleate epitaxially on the grains of the substrate [9,34,35]. For this reason, the columnar grain boundaries of the deposit are along the grain boundaries of the substrate and form a continuous network (Figure 4a).…”

Section: Microstructurementioning

confidence: 99%

“…It is known that the AA2024 alloy is susceptible to solidification cracks or liquation cracks being characterized by a large solidification range, high thermal expansion, large solidification shrinkage, and a large quantity of alloying addition [9,35]. Solidification cracking occurs during the solidification of melt.…”

Section: Effect Of the Parameters Electric On Substrate/deposit Intermentioning

confidence: 99%

“…Simultaneously, the rapid cooling from the ESD process induces a great thermal strain that opens the liquated zones. Therefore, due to ESD process, those cracks are inevitable on the heat sensitive AA2024 substrate [9,12,39,40]. Once initiated, the cracks propagate along the substrate grain boundary and may also easily propagate in the deposited layers giving rise in a continuous network (Figure 15a).…”

Section: Effect Of the Parameters Electric On Substrate/deposit Intermentioning

confidence: 99%

“…Sometimes, the physical and microstructural characteristics of the alloy limit the fusion welding repair techniques [6]. For instance, the fusion welding repair process of AA20204 is not suitable because the alloy is specifically susceptible to hot cracking, both in the welding (solidification cracking) and in the base metal (liquation cracking) [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

2017

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ElectroSpark Deposition (ESD) is a pulsed micro-welding process that is capable of depositing wear and corrosion resistance deposit to repair, improve, and to extend the service life of the components and tools. Major new applications have taken place in gas turbine blades and steam turbine blade protection and repair, and in military, medical, metal-working, and recreational equipment applications. In this study, the ESD technique was exploited to fabricate 2024 aluminum alloy deposit on a similar substrate. The deposits were deposited using different process parameters. Heat input was varied on three levels. The outcoming microstructure was analyzed by optical and scanning electron microscopies. The deposit was characterized by the overlapping of layers with a mixed microstructure. The average hardness was independent from the process parameters. Both porosity inside the deposits and cracks at the deposit/substrate interface were detected. The porosity lowered with the heat input and increased the average length of cracks.

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Section: Microstructurementioning

confidence: 99%

Section: Effect Of the Parameters Electric On Substrate/deposit Intermentioning

confidence: 99%

Section: Effect Of the Parameters Electric On Substrate/deposit Intermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

2017

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“…It has been proved that several problems like solidification cracking, grain boundary melting in the base metal (liquation cracking), and changes in metallurgical structure would arise mainly due to the high thermal process input [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Repairing 2024 Aluminum Alloy via Electrospark Deposition Process: A Feasibility Study

Renna

Leo

Casalino

et al. 2018

Advances in Materials Science and Engineering

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e electrospark deposition (ESD) technique has been studied as a potential method to repair locally damaged 2024 rolled sheets supplied in natural-aged (T4) and artificial-aged (T6) conditions. e 2024-T4 and 2024-T6 tensile samples were first notched, and then the notches were filled (repaired) by ESD with the same aluminum alloy. e effect of process parameters on the microstructure of the filling material and the substrate properties was studied by optical and scanning electron microscopy. Tensile and hardness tests were performed. e tensile test showed that T4 and T6 as-repaired specimens had low tensile properties, which was due to defectiveness and residual stress caused by high cooling rate during reparation. However, the asrepaired specimens were heat-treated at either 135°C or 190°C to improve the mechanical properties. A better yield strength was observed for the T4 heat-treated alloy. e ductility and ultimate tensile strength did not change, being mainly affected by voids and microcracks.

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Aircraft Aluminum Alloys: Applications and Future Trends

Kermanidis

2020

Revolutionizing Aircraft Materials and Processes

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The relation between liquation and solidification cracks in pulsed laser welding of 2024 aluminium alloy

Cited by 116 publications

References 8 publications

Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

Repairing 2024 Aluminum Alloy via Electrospark Deposition Process: A Feasibility Study

Aircraft Aluminum Alloys: Applications and Future Trends

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