The effect of pressure and pouring temperature on the porosity, microstructure, hardness and yield stress of AA2024 aluminum alloy during the squeeze casting process

Jahangiri, Amir; Marashi, S. P. H.; Mohammadaliha, M.; Ashofte, V.

doi:10.1016/j.jmatprotec.2017.02.005

Cited by 88 publications

(27 citation statements)

References 12 publications

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“…They also affirm that the porosity of the solid-state metal occurs due to the liquid incapacity to fill the bubbles during the metal continuous cooling and solidification (the volume shrinkage associated with solidification cannot be compensated by the interdendritic flowing opposite to the displacement of the isotherms). All those variables affect the amount, size and morphology of formed pores [1][2][3][4][5][6][7] . Gali…”

Section: Methodsmentioning

confidence: 99%

The Effect of Casting Speed and the Fraction of Al5%Ti1%B Inoculant on the Microstructure and Mechanical Properties of the AA5052 Aluminum Alloy Produced by the Direct Chill Process

Faria

Leite

2018

Mat. Res.

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This study aimed to assess the effect of casting speed and the addition of Al5%Ti1%B inoculant in the casted AA5052 aluminum alloy plate manufactured by the Direct Chill process. The focus of this work was to decrease the rejection index of rolled products due to the occurrence of superficial flaws on plates. These defects impact directly on the production costs and on the rolled product quality. The main cause of those flaws is associated with the billet porosity that is related with the excess of atomic hydrogen incorporated into the metallic bath and with the metal shrinkage during solidification. Four different cast conditions were industrially tested, combining two casting speeds and two inoculants amounts. The effect of those variables on the alloy mechanical properties and on their performance in rolling process was also assessed. It was observed that the higher the casting speed and the inoculant fraction, the more refined the microstructure and the lower the fraction and diameter of formed micropores. The increase of casting speed and the inoculant fraction improved the AA5052 alloy rolling performance. The application of these results in an industrial scale performed a decrease from 5.03% to 0.39% per month in the rejection index of rolled products.

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Section: Methodsmentioning

confidence: 99%

The Effect of Casting Speed and the Fraction of Al5%Ti1%B Inoculant on the Microstructure and Mechanical Properties of the AA5052 Aluminum Alloy Produced by the Direct Chill Process

Faria

Leite

2018

Mat. Res.

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“…A non-consumable electrode arc was used during the vacuum melting. In the process of melting, the higher the arc current, the higher the pouring temperature, 20 which leads to the superheating of the liquid alloy. When the superheating of the liquid alloy becomes higher, the viscosity of the liquid alloy will be reduced.…”

Section: Effect Of the Arc Current On The Microstructure And Propertimentioning

confidence: 99%

“…The casting temperature is improved directly by increasing the arc current. The overheated alloy liquid causes an air gap between the molten alloy and the copper mould due to the thermal expansion, 20 which reduces the heat-transfer coefficient between the molten alloy liquid and the copper mould, and inhibits the heat conduction. Therefore, the cooling rate is also reduced, which makes the crystal structure of the alloy thicker and form maple-leaf crystals.…”

Section: Effect Of the Arc Current On The Microstructure And Propertimentioning

confidence: 99%

Effect of the processing parameters on the microstructure and properties of the ZL116 aluminium alloy after vacuum suction casting

Pan¹,

He²,

Huo³

et al. 2018

Mater. Tehnol.

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The selection of different processing parameters has an important influence on the microstructure and properties of castings. The aim of this investigation is to study the effect of the processing parameters of vacuum suction casting (VSC) on the microstructure and mechanical properties of the ZL116 aluminium alloy. The ZL116 aluminium alloy rods were prepared under an arc current of 300-400 A and a suction diameter of 3.0-3.5 mm using a vacuum-suction-casting machine. The microstructures of the alloys rods were observed with a scanning electron microscope (SEM). The mechanical properties of the alloy specimens were measured with a universal tension tester, a microhardness tester and an electrical resistivity tester. The experimental results show that the microstructure of the ZL116 aluminium alloy is more compact and uniform under an arc current of 300 A and a suction diameter of 3 mm. The mechanical properties and the electrical resistivity are also improved due to an increase of the strengthening phase. The microhardness reached 93.62 HV, the tension strength reached 199.79 MPa, and the total elongation at the breaking point reached 30.60 %.

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“…Microstructures and mechanical properties are also dependent on parameters of the casting process. Although pouring and mold temperatures are two important casting parameters to produce high quality and low porosity castings [16,17] , there are limited studies showing the effects of pouring temperature, mold temperature, mold cooling conditions on the performance of A356 in permanent mold casting. In this study, in order to study the effect of specific cooling conditions on the microstructure and mechanical properties of the A356, a temperature controlled permanent mold is developed to fabricate A356 castings.…”

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confidence: 99%

Effect of pouring and cooling temperatures on microstructures and mechanical properties of as-cast and T6 treated A356 alloy

Zhao

Wang

et al. 2019

China Foundry

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A 356 is a hypoeutectic Al-Si alloy which has been widely used in many industrial fields owing to its good castability, low density, high corrosion resistance, and good weldability [1-3]. The T6 heat treated A356 has often been used in automobile wheel hubs [4-5]. In order to achieve good comprehensive performance, the most common method is adding less than 0.2wt.% of Ti to the Al-Si alloy to refine the grain size and obtain a fine-equiaxed structure. Al 3 Ti and α-Al have similar lattice constants, so the Al 3 Ti particles act as heterogeneous nucleation sites for α-Al grains and refine the microstructure of A356 [6,7]. However, a previous researcher found that the Al 3 Ti particles can only dissolve into liquid alloy at high temperature, which significantly deteriorates its refining effect [8,9]. As it was known, the mechanical properties of A356 are largely dependent on the size and morphology of eutectic Si phase. The T6 heat treatment can help

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The effect of pressure and pouring temperature on the porosity, microstructure, hardness and yield stress of AA2024 aluminum alloy during the squeeze casting process

Cited by 88 publications

References 12 publications

The Effect of Casting Speed and the Fraction of Al5%Ti1%B Inoculant on the Microstructure and Mechanical Properties of the AA5052 Aluminum Alloy Produced by the Direct Chill Process

The Effect of Casting Speed and the Fraction of Al5%Ti1%B Inoculant on the Microstructure and Mechanical Properties of the AA5052 Aluminum Alloy Produced by the Direct Chill Process

Effect of the processing parameters on the microstructure and properties of the ZL116 aluminium alloy after vacuum suction casting

Effect of pouring and cooling temperatures on microstructures and mechanical properties of as-cast and T6 treated A356 alloy

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