New apparatus for characterising tensile strength development and hot cracking in the mushy zone

Instone, Stephen; StJohn, David H.; Grandfield, John

doi:10.1080/13640461.2000.11819381

Cited by 62 publications

(36 citation statements)

References 6 publications

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“…Investigations on hot tears have been reported in many previous studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] and it is concluded that when tensile stress or strain exceeds the fracture strength or fracture strain of the solidifying material, a crack can be generated. Values of fracture strain and fracture strength, however, are considerably different by measurement technique used and experimental condition applied.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2006

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“…The solidification method involves cooling a specimen from liquid to solid in a mold and measuring the mechanical properties of the alloy during cooling [27][28][29][30][31]. It can be used for measuring mechanical properties in the nonequilibrium mushy zone, but its accuracy is influenced by interactions between the specimen and the mold and by the non-uniform temperature distribution in the specimen.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of hot tears is closely related to the mechanical properties of the alloy at small liquid fractions in the mushy zone [23][24][25][26][27][28][29][30][31]. The common approaches for measuring the mechanical properties of alloys at mushy zone temperatures include the heating method [24][25][26] and the solidification method [27][28][29][30][31]. The most widely used method is the heating method, which involves heating a specimen to the desired mushy zone temperature, holding the specimen at the test temperature for a certain amount of time to obtain a uniform temperature distribution in the gauge length of the specimen, and then measuring the properties.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Optimization of Direct Chill Casting to Reduce Ingot Cracking

Das¹

2006

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“…Thirdly, one must be able to link the strain to the accumulation of damage prior to failure. While a number of recent experimental studies have been designed to investigate these requirements [15][16][17][18][19][20][21][22][23][24], a comprehensive understanding linking microstructural features to semi-solid constitutive behavior is needed to improve hot tearing criteria.…”

Section: Introductionmentioning

confidence: 99%

A three-phase simulation of the effect of microstructural features on semi-solid tensile deformation

Phillion¹,

Cockcroft²,

Lee³

2008

Acta Materialia

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A direct finite element microstructure model for prediction of the deformation behavior of semisolid metallic alloys is presented. The 2D model geometry is based on a modified Voronoi tessellation, and includes rounded corners to approximate an equiaxed-globular grain structure, liquid surrounding the grains, and micro porosity. An elasto-plastic empirical constitutive equation is derived for the solid grains, while the liquid is approximated as a perfectly plastic material with a very low yield stress. The resulting three-phase model was used to investigate the effects of fraction solid, porosity, and grain size on the constitutive behavior of a semi-solid aluminum alloy, AA5182. The model predictions were validated against experimental data at high fraction solid. These simulations reveal a strong correlation between semi-solid grain size and yield stress, and between porosity and strain localization. The application of direct finite element simulations is shown to be an effective technique for examining the effects of microstructure phenomena on the macro constitutive behavior of semi-solid materials.

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New apparatus for characterising tensile strength development and hot cracking in the mushy zone

Cited by 62 publications

References 6 publications

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

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

Modeling and Optimization of Direct Chill Casting to Reduce Ingot Cracking

A three-phase simulation of the effect of microstructural features on semi-solid tensile deformation

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