Simulation of semi-solid thixoforging using a micro-macro constitutive equation

Cezard, Pierre; Favier, Véronique; Bigot, Régis; Balan, Tudor; Berveiller, M.

doi:10.1016/j.commatsci.2004.09.036

Cited by 20 publications

(16 citation statements)

References 15 publications

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“…At rest, the solid globules tend to agglomerate leading to the formation of a 3D network. The viscoplastic deformation is assumed to be accommodated by the solid bonds and the free liquid (Cezard et al, 2005;Favier et al, 2009;Favier and Atkinson, 2011). The solid agglomerates are presumed to deform very little though they contribute to an increase in the suspension viscosity.…”

Section: Modeling Materials Behaviour and Parameter Identificationmentioning

confidence: 99%

“…The constitutive equations adopted for this study are based on a micromechanical model proposed by Cezard et al (2005) and Favier et al (2009) which separates the role of four mechanical phases: the solid globules/agglomerates; the solid bonds between the solid globules; the free liquid; and liquid entrapped in the solid globules. The overall solid fraction is termed f s .…”

Section: Modeling Materials Behaviour and Parameter Identificationmentioning

confidence: 99%

“…The impact of the presence of an obstacle, ram speed and friction conditions on the processing is discussed. For this purpose, a micro-macro constitutive model proposed by Cezard et al (2005) and Favier et al (2009) was used. Some preliminary results have been reported in Neag et al (2014) but this paper presents a much fuller analysis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison between numerical simulation of semisolid flow into a die using FORGE© and in situ visualization using a transparent sided die

Neag

Favier

Bigot

et al. 2016

Journal of Materials Processing Technology

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a b s t r a c tSemi-solid processing is a promising forming process for shaping metallic alloys in one shot. Numerical simulations are of great interest for optimizing the process. Generally, numerical simulation results are compared with interrupted flow experiments but these do not fully reflect the progress of material into the die because of the inertia of the flowing material which continues to move after the interruption to the shot. Results are available for in situ visualization of flow using transparent sided dies. Here die filling with a 90 • change of flow path was simulated using the FORGE © finite element code and a constitutive equation based on a micro-macro modelling approach. The predicted flow behaviour was compared to the in situ visualization images obtained with a transparent glass sided die and reported in the literature. The impact of the presence of an obstacle, ram speed and friction coefficients on the material flow front is discussed. The initial solid skeleton is broken as soon as the material is deformed. The effect of the ram speed on the flow front is successfully represented by keeping the same parameters for the constitutive laws but requires a change in the friction coefficients. Friction modelling using the Coulomb law limited by Tresca cannot represent the ram speed effect on experimental friction conditions for the in situ visualisation tests used for the comparison here. However, the effect of an obstacle within the die on the material flow front is predicted well.

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Section: Modeling Materials Behaviour and Parameter Identificationmentioning

confidence: 99%

Section: Modeling Materials Behaviour and Parameter Identificationmentioning

confidence: 99%

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Comparison between numerical simulation of semisolid flow into a die using FORGE© and in situ visualization using a transparent sided die

Neag

Favier

Bigot

et al. 2016

Journal of Materials Processing Technology

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“…From a forged product point of view, experimental results lead to a new design of parts from functional specifications. This design approach is based on predictive tools such as behaviour laws developed and implemented with dedicated software such as Forge2005® [7,10].…”

Section: MM 100mm 100mm 100mmmentioning

confidence: 99%

Metallurgical and mechanical analysis from thixoforging steel shape

et al. 2008

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Since always, Industry minimizes manufacturing process plan and increases mechanical behaviour. In this topic, the thixoforging process offers important perspectives especially steel thixoforging. It is on the way of industrial development between casting and forging process. Previous works have illustrated the importance many parameters such as steel grade, slide speed, slug and tool temperature on the geometry from thixoforging part and of the forming load.e -mail: p.cezard@ascometal.lucchini.com This paper completes the previous results. It presents an analysis from mechanical resistance of samples extracted of from thixo-extrusion parts on a high speed hydraulic press. This strength investigation is correlated with metallurgical analysis. Macrograph analyses allow identifying the material yield during the process and the different phases.

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mentioning

confidence: 99%

Steel Thixoforging: Heat Exchange Impact on the Mechanical and Metallurgical Features of Thixoforged Samples

Becker

Cezard

Bigot

et al. 2008

SSP

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Steel thixoforging process combines the advantages of performing parts having highly complex shapes and good mechanical properties. These advantages result from the shear thinning flow behaviour of semi-solids due to microstructure changes during the material deformation. Many parameters such as steel grade, raw speed, slug temperature, tool temperature influence the steel thixoforging process. In this work, we are interested in analysing the influence of thermal conditions as well as ram speed on the flow behaviour and the microstructure of the final parts. To do so, thixo-extrusion tests on a high speed hydraulic press were performed on C38 steels using different ram speeds and different temperatures for the tools. The temperature is measured in the die close to the tool-material interface during the whole process. Correlations between the temperature measurements, the flow profile and the microstructure are discussed. Using the Finite Element code Forge2005, these thixo-extrusion tests are simulated. Using an inverse method, some parameters used in the thermal exchange modelling are identified by successive comparisons between calculated and measured temperatures within the die.

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Simulation of semi-solid thixoforging using a micro-macro constitutive equation

Cited by 20 publications

References 15 publications

Comparison between numerical simulation of semisolid flow into a die using FORGE© and in situ visualization using a transparent sided die

Comparison between numerical simulation of semisolid flow into a die using FORGE© and in situ visualization using a transparent sided die

Metallurgical and mechanical analysis from thixoforging steel shape

Steel Thixoforging: Heat Exchange Impact on the Mechanical and Metallurgical Features of Thixoforged Samples

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