Metal flow in the direct axisymmetric extrusion of aluminium

Valberg, Henry

doi:10.1016/0924-0136(92)90005-d

Cited by 22 publications

(18 citation statements)

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“…3. The generally equiaxial, uniform grain microstructure determined here is in agreement with the expectation that little or no deformation takes place in the DMZ [1,2,24]. In the neighboring shear intensive zone (SIZ) the material undergoes significant and predominantly shear deformation.…”

Section: General Microstructure Developmentsupporting

confidence: 83%

“…1, three different zones of microstructural development are evident. The dead material zone (DMZ) forms a hollow cone in the boundary region at the front of the billet where friction between the billet, container and die inhibits significant deformation [24,25]. A sample micrograph obtained from the EBSD measurement at point DMZ1 is shown in Fig.…”

Section: General Microstructure Developmentmentioning

confidence: 99%

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Characterization of grain microstructure development in the aluminum alloy EN AW-6060 during extrusion

Kayser

Klusemann

Lambers

et al. 2010

Materials Science and Engineering: A

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Section: General Microstructure Developmentsupporting

confidence: 83%

Section: General Microstructure Developmentmentioning

confidence: 99%

Characterization of grain microstructure development in the aluminum alloy EN AW-6060 during extrusion

Kayser

Klusemann

Lambers

et al. 2010

Materials Science and Engineering: A

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“…Figure 6 shows the material flow obtained from the simulation in three different stages of the investigated extrusion processes. It can be seen that the simulation gives the typical material flow for direct extrusion of aluminium that has been found in experimental studies elsewhere [1,2,25,26]. The simulation shows a dead metal zone according to flow type B1 or C (area A in Fig.…”

Section: First Evaluation Of the Simulation Resultssupporting

confidence: 63%

Finite element method simulation of internal defects in billet-to-billet extrusion

Hatzenbichler

Buchmayr

2010

Proceedings of the Institution of Mechanical Engineers, Part B:

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During billet-to-billet extrusion of aluminium alloys, internal defects occur at the location where the billets are welded together. These defects are unacceptable and must be cut out from the extruded section. Hence, the efficiency of this process significantly depends on the length of these internal defects. The defects that arise inside the extruded section are the so-called back-end defect, which occurs as a result of inflow of the lateral billet surface contaminated with oxide into the extrudate, and transverse welds, which occur as a result of inflow of the face surfaces of the billets pressed together. The length of these defects depends on different process parameters such as friction, billet temperature, geometry of the tools, geometry of the extrudate, etc. In this study, finite element method (FEM) simulation is done to quantify the main parameters influencing the back-end defect and transverse weld formation. The first part of this work deals with modelling techniques that have to be developed to obtain information about the length of internal defects in extruded products from FEM simulation. Comparison is done between the simulation results and experimental studies to verify the results obtained from finite element analysis. In the second part of this work, the model is used to determine the main parameters influencing the back-end defect and the length of transverse welds in a computational investigation.

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“…Key to use of marker inserts to study flow are different etching characteristics between marker and parent metal and similar flow stress of marker and parent metal at relevant temperatures. For example Valberg studied material flow in direct extrusion of an Al-Mg-Si alloy using AlCu 2.5 indicator pins inserted into a billet in a grid pattern (Valberg, 1992). Widerøe and Welo (2013) developed a novel contrast material technique to visualize the material flow in the screw extrusion process.…”

Section: Introductionmentioning

confidence: 99%