Simulation of Porosity and Hot Tears in a Squeeze Cast Magnesium Control Arm

Carlson, Kent; Beckermann, C.; Jekl, J.; Berkmortel, R.

doi:10.1007/978-3-319-48223-1_19

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Therefore, using this method to determine material constants for a constitutive equation to predict hot tearing is inappropriate. In 2011, K. D. Carlson et al 5) used an inelastic constitutive equation for Mg-Al alloys in solidliquid coexisting state in order to predict hot tearing in a shape casting, as shown in eq. (4).…”

Section: +1mentioning

confidence: 99%

Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

et al. 2015

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Predicting hot tearing during direct chill casting using thermal stress analysis requires constitutive equations in both semi-solid state and below the solidus of the alloy. However, numerous difficulties have been hindered constitutive equations used heretofore for hot tearing predictions. (1) Testing methods for obtaining material constants were inappropriate. First, the elastic strain reversibility was unconfirmed. Second, a flat distribution of temperature in the specimen gauge length was not guaranteed. Third, strain was measured not from local strain but from cross-head displacement. Fourth, the melt-back phenomenon was unavoidable in test during partial remelting because of homogenization of the segregation structure. (2) Temperature dependence of the strain-rate sensitivity of stress was not considered. (3) Some material constants were inferred, not obtained experimentally. This study developed elasto-viscoplastic constitutive equations (Hooke's and viscoplastic NortonHoff laws) for partially solidified state and below the solidus. To obtain material constants experimentally, two tensile tests for which issue (1) was addressed were conducted using Al-5 mass%Mg alloy. They were a tensile test after partial solidification and high-temperature tensile test with high-frequency induction coil. After the temperature dependence of elastic and viscoplastic properties was investigated, material constants were obtained and were compared with those obtained using earlier testing methods.

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Section: +1mentioning

confidence: 99%

Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

et al. 2015

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Viscosity Properties Prediction of Semi-Solid Aluminum Alloys Using Finite Element Analysis Based on Quenched Solidified Structure, and Experimental Validation

et al. 2020

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For predicting hot tearing during casting process, viscosity properties and constitutive equations in the semi-solid region are required. In this research, viscosity properties of two alloys, which are Al5 mass%Mg alloy with TiB grain-refiner and Al2 mass%Cu alloy with TiB grain-refiner, are estimated using the image-based modelling method as suggested by Matsushita et al. As to the mechanical properties of the solid phase in semi-solid region, it is found that by using the temperature dependent value rather than the value just below the solidus temperature, the prediction accuracy of the viscosity value in semi-solid region has increased. By comparing the obtained numerical properties with the experimental properties, it is found that the method can predict the viscosity properties of Al5 mass%Mg alloy and Al2 mass%Cu alloy in the semi-solid region at the solid fraction where hot tears are likely to occur.

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Simulation of Porosity and Hot Tears in a Squeeze Cast Magnesium Control Arm

Cited by 2 publications

References 2 publications

Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

Viscosity Properties Prediction of Semi-Solid Aluminum Alloys Using Finite Element Analysis Based on Quenched Solidified Structure, and Experimental Validation

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