Effect of Microstructure and Casting Defects on the Mechanical Properties of Secondary AlSi10MnMg(Fe) Test Parts Manufactured by Vacuum Assisted high Pressure Die Casting Technology

Niklas, Andrea; Bakedano, A.; Orden, S.; Silva, M. da; Noguès, E.; Fernández-Calvo, Ana Isabel

doi:10.1016/j.matpr.2015.10.059

Cited by 35 publications

(8 citation statements)

References 12 publications

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“…The stress function is introduced, and the former equation can be represented in the form of a two-component function, as shown in Equation (5).…”

Section: The Stress Concentration Mechanism Of Tensile Fracturementioning

confidence: 99%

“…The porosity not only reduces the effective stress area of the casting but also induces crack formation at local stress concentrations. These effects severely limit the elongation of the alloy [4][5][6][7][8][9]. Generally, the pores are formed by residual gas in the castings and the gas involved in the filling process of a metallic liquid [10,11].…”

Section: Introductionmentioning

confidence: 99%

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The Stress Concentration Mechanism of Pores Affecting the Tensile Properties in Vacuum Die Casting Metals

et al. 2020

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The absolute pressure strongly affects the porosity and mechanical properties of castings produced by vacuum high-pressure die casting (V-HPDC) technology. The pore size, quantity and distribution of AlSi9Cu3 samples under three absolute pressures were evaluated by X-ray tomography and optical and electron microscopy. The paper presents an elaboration the stress concentration mechanism of pores affecting the tensile properties. According to a mathematical analysis of a sample under uniaxial stress, the greater the radius of the pore, the higher the stress value is at the pore perimeter. When the absolute pressure drops from 1013 mbar to 100 mbar, the porosity decreases from 6.8% to 2.8%, and the pore number and mean size decreases. In tensile tests, the pore sizes of the fracture surface decrease with decreasing absolute pressure, and the pore distribution becomes uniform. The tensile properties and extensibility of the sample are improved, and the microscopic fracture surface of the sample changes from cleavage fracture to quasi-cleavage fracture. The number, size and distribution of pores in die casting collectively affect the properties of the sample. Large-size or complex pores or pores with concentrated distributions produce large stress concentrations, decreasing the strength of the metal.

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“…The stress function is introduced, and the former equation can be represented in the form of a two-component function, as shown in Equation (5).…”

Section: The Stress Concentration Mechanism Of Tensile Fracturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Stress Concentration Mechanism of Pores Affecting the Tensile Properties in Vacuum Die Casting Metals

et al. 2020

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“…Foreign materials were not detected in the inspected casting set. Aluminum oxide was detected on the fracture surface in a few samples [26]. But, because of the nature of the aluminum oxide it cannot be detected in the casting with X-ray.…”

Section: Die Casting Quality Evaluationmentioning

confidence: 99%

The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

Szalva

Orbulov

2019

Inter Metalcast

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High pressure die casting (HPDC) is a widely used casting technology for product that is made of light metal such as aluminum alloy. During die casting process the molten metal is injected into a mold at high speed and solidify under high pressure. The amount of porosity in the cast part is an important question. Lots of technologies have been developed to minimize porosities, for example, vacuum-assisted high pressure die casting process (VPDC). In this paper, AlSi9Cu3(Fe) aluminum alloy castings were produced by conventional HPDC with atmospheric venting and VPDC process under three different absolute cavity air pressures of 170 mbar, 90 mbar and 70 mbar at the cavity. The influence of absolute cavity air pressure on the porosity and on the mechanical properties of the castings were investigated and compared with conventional HPDC casting method. The results of the present study proved that the amount of porosity and the pore sizes in the castings can be significantly reduced from 1.10% at an atmospheric level to 0.47% at 70 mbar. This corresponds to 57% reduction. As a result, the mechanical properties are improved significantly, particularly, the tensile strength from 271.6 MPa to 299.8 MPa, which corresponds to 10% increment and the elongation from 1.66% to 2.49%, which shows 50% increment. At lower absolute cavity air pressure the entrapped gases become the final gas porosities in the die castings and shows solidification shrinkage form inspected with scanning electron microscopy. In general, lower cavity air pressure contributes to reduce the pores, which improve the mechanical properties of die casting.

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“…The ductility obtained on parts cast by V-HPDC is significantly higher compared with the conventional HPDC technology. Considering the UNE-EN-1706:2020 standard as a reference, the minimum elongation required for the AlSi9Cu3(Fe)(Zn) alloy (the most used secondary alloy in conventional HPDC process [4][5][6]) is 1 % in F state, whereas for a V-HPDC component cast in AlSi10MnMg a minimum of 12 % after T7 heat treatment is determined [3][4][5][6][7]. The huge difference in elongation is associated to the different composition and microstructure of both alloys, the higher melt cleanliness [7][8] and the lower porosity achieved by vacuum application in V-HPDC.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the secondary aluminium metallurgical quality by means of an adequate melt treatment.

Baquedano¹,

Niklas²,

Ai³

et al. 2021

Preprint

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This work has the purpose to demonstrate that if an adequate melt treatment is applied, it is pos-sible to obtain recycled aluminium alloy AlSi10MnMg(Fe) with as good metal cleanliness than primary AlSi10MnMg alloy. The melt quality is assessed by the thermal analysis, density index, macro- and micro-inclusions tests, of one primary and two secondary alloys, before and after the melt treatment. The melt treatment is based on deoxidation, degassing and skimming with de-tailed procedure described in this article. The different analysis are: Thermal analysis to compare the variables of the solidification cooling curve (Al primary temperature and its undercooling; Al-Si eutectic temperature and its recalescence); Density index is used to evaluate the hydrogen gas content in the melt; Macroinclusions level is analysed after solidifying the melt under vacuum of 5 mbar, favouring inclusion floatation to the sample surface; Microinclusion level is evaluate with porous disc filtration apparatus (similar to PoDFA).

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Effect of Microstructure and Casting Defects on the Mechanical Properties of Secondary AlSi10MnMg(Fe) Test Parts Manufactured by Vacuum Assisted high Pressure Die Casting Technology

Cited by 35 publications

References 12 publications

The Stress Concentration Mechanism of Pores Affecting the Tensile Properties in Vacuum Die Casting Metals

The Stress Concentration Mechanism of Pores Affecting the Tensile Properties in Vacuum Die Casting Metals

The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

Improvement of the secondary aluminium metallurgical quality by means of an adequate melt treatment.

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