Effect of Iron Content on Hot Tearing of High-Strength Al-Mg-Si Alloy

Nagaumi, Hiromi; Suzuki, Satoru; Okane, Toshimitsu; Umeda, T.

doi:10.2320/matertrans.47.2821

Cited by 35 publications

(26 citation statements)

References 12 publications

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“…According to the recent paper, the validity of ThermoCalc prediction to solidification sequence of this alloy system with a little different composition was also confirmed. 22) 3.3 Mechanical properties; ZDT and ZST Figure 8 shows the relationship of tensile strength, elongation, solid fraction and temperature. The tensile strength decreases with the increase in temperature.…”

Section: Specific Heatmentioning

confidence: 99%

Mechanical Properties of High Strength Al-Mg-Si Alloy during Solidification

et al. 2006

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Mechanical properties of high strength Al-Mg-Si alloy during solidification have been investigated. Tensile strength and ductility have been measured by using an electromagnetic induction heating tensile machine. The relation between solid fraction and temperature was calculated by the Gulliver-Scheil model applied with the thermodynamic data-base Thermo-Calc for multi-component system, and its validity was confirmed, comparing with the experiment. Zero Strength Temperature (ZST) and Zero Ductility Temperature (ZDT) were evaluated and correlated with the corresponding solid fraction. Furthermore, the capability of the high temperature tensile test to apply to the break-out of direct chill (DC) casting was examined, comparing the breaking section of the tensile test sample with that of DC billet. Main conclusions are as follows: (1) ZST and ZDT were 893 and 883 K at which the corresponding solid fraction were 0.69 and 0.77, respectively. (2) Breaking sections of the tensile testing sample and DC billet had a similar rupture structure where intergranular fracture was observed. Consequently, it was considered that breaking elongation and breaking strength that were obtained by the present tensile test can be used as one of the criteria of Direct-Chill casting crack formation.

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Section: Specific Heatmentioning

confidence: 99%

Mechanical Properties of High Strength Al-Mg-Si Alloy during Solidification

et al. 2006

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“…By further increasing the displacement to 0.07 and 0.08 mm (Figs. 8c and d), the micro-necks stretch and plastically deform [43]. Some micro-necks begin to break at a displacement of 0.08 mm (Fig.…”

Section: Deformation Behaviormentioning

confidence: 91%

Effects of Iron-Rich Intermetallics and Grain Structure on Semisolid Tensile Properties of Al-Cu 206 Cast Alloys near Solidus Temperature

Bolouri

Liu

Chen

2016

Metall Mater Trans A

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The effects of iron-rich intermetallics and grain size on the semisolid tensile properties of Al-Cu 206 cast alloys near the solidus were evaluated in relation to the mush microstructure.Analyses of the stress-displacement curves showed that the damage expanded faster in the mush structure dominated by plate-like β-Fe compared to the mush structure dominated by Chinese script-like α-Fe. While there was no evidence of void formation on the β-Fe intermetallics, they blocked the interdendritic liquid channels and thus hindered liquid flow and feeding during semisolid deformation. In contrast, the interdendritic liquid flows more freely within the mush structure containing α-Fe. The tensile properties of the alloy containing α-Fe are generally higher than those containing β-Fe over the crucial liquid fraction range of ~0.6 to 2.8%, indicating that the latter alloy may be more susceptible to stress-related casting defects such as hot tearing. A comparison of the semisolid tensile properties of the alloy containing α-Fe with different grain sizes showed that the maximum stress and elongation of the alloy with finer grains were moderately higher for the liquid fractions of ~2.2-3.6%. The application of semisolid tensile properties for the evaluation of the hot tearing susceptibility of experimental alloys is discussed.2

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“…Cette dernière aura une importance capitale sur le risque d'apparition de criques à chaud étant donné qu'elle peut conditionner la distribution du liquide par rapport à la phase solide. Ainsi, une microstructure fine sera moins sensible à la fissuration à chaud étant donné que cela favorise une meilleure accommodation des déformations par glissements aux joints de grains ([Pierer, 2007]). De la même manière, on observera une ductilité bien plus grande dans le cas d'une microstructure équiaxe que dans le cas d'une microstructure colonnaire ([Eskin, 2004a]).…”

Section: Ii3 Les Paramètres Influents De La Fissuration à Chaudunclassified

Hot Tearing in Steels During Solidification: Experimental Characterization and Thermomechanical Modeling

Cerri

Chastel

Bellet

2008

Journal of Engineering Materials and Technology

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Hot tearing is a major defect in castings or semifinished cast products. It corresponds to the opening of cracks in the mushy zone and, more precisely, in the areas with high fraction of solid (typically 0.9 and beyond) when the material is subjected to deformations leading to local tensile stress. Various kinds of criteria have been developed to highlight a risk of formation of hot tears. The aim of this study is to evaluate their capability to predict the occurrence of hot tears correctly. In order to do so, two kinds of tests have been analyzed with the use of a thermomechanical finite element model.

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Effect of Iron Content on Hot Tearing of High-Strength Al-Mg-Si Alloy

Cited by 35 publications

References 12 publications

Mechanical Properties of High Strength Al-Mg-Si Alloy during Solidification

Mechanical Properties of High Strength Al-Mg-Si Alloy during Solidification

Effects of Iron-Rich Intermetallics and Grain Structure on Semisolid Tensile Properties of Al-Cu 206 Cast Alloys near Solidus Temperature

Hot Tearing in Steels During Solidification: Experimental Characterization and Thermomechanical Modeling

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