Prediction and control of subgrain size in the hot extrusion of aluminium alloys with feeder plates

Velay, Xavier

doi:10.1016/j.jmatprotec.2008.08.021

Cited by 11 publications

(4 citation statements)

References 7 publications

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“…The subgrains at such values of the Zener-Hollomon parameter are rather large and have the same size in all alloys, which can be clearly seen from Figure 17 using the data obtained in [19,35]. For plotting the well spread [40,41] in Figure 17, Equation 4 For 1565 and 5182 the following values of coefficients, namely m = 1, A = 0.0077, B = 0.0059, were taken from [19]. Coefficients m = 1, A = 0.0077, B = 0.0059 were taken for 8011 from [35].…”

Section: Modeling the Texture Formation Processmentioning

confidence: 64%

Investigation of the Intermetallic Compounds Fragmentation Impact on the Formation of Texture during the as Cast Structure Thermomechanical Treatment of Aluminum Alloys

Aryshenskii

Hirsch

Konovalov

2021

Metals

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In this work, the influence of the intermetallic particle fragmentation during hot rolling of the as cast structure on the evolution of textures in aluminum alloys 8011, 5182 and 1565 was investigated. For this purpose, laboratory multi-pass rolling of the cast material was carried out. At various degrees of hot rolling deformation, the process was stopped, and the metal was quenched and sent for optical and electron microscopy to investigate the large intermetallic particles. In addition, the grain structure was studied and an X-ray analysis was carried out in order to determine the main texture components. Some of the samples were held at a temperature above the recrystallization threshold and then cooled in air; the grain structure and texture composition were also studied. In addition, the simulation of the texture evolution was carried out under various modes of rolling of aluminum alloys, taking into account the process of fragmentation of intermetallic particles. The investigation showed that intermetallic compounds with a deformation degree of 1.8, on average, decrease the particle size by 5–7 times. The large eutectic particles remaining after homogenization are drawn out in the direction of deformation and are crushed, increasing their number accordingly. Therefore, the most favorable stage for the formation of recrystallization nuclei on particles is the moment when they are already numerous and their sizes are much larger than subgrains. Simulation of hot rolling of the investigated alloys showed that considering the factor of fragmentation of intermetallic particles during hot deformation of the as-cast structure significantly increases the accuracy of the results.

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Section: Modeling the Texture Formation Processmentioning

confidence: 64%

Investigation of the Intermetallic Compounds Fragmentation Impact on the Formation of Texture during the as Cast Structure Thermomechanical Treatment of Aluminum Alloys

Aryshenskii

Hirsch

Konovalov

2021

Metals

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“…The pocket extrusion die provides the pressure needed for charge weld [2,14]. On the other hand, using the pocket in front of the die exit is an effective solution for controlling the distribution of the velocity of metal flow in the die [2,14,19,20]. The pocket geometry can be designed with single or multiple steps.…”

Section: Die Designmentioning

confidence: 99%

“…Zhang et al [25] designed the pocket geometry for complex aluminum profile production using an automatic mesh deformation method. Xavier [19] compared the relevant extrusion parameters of the flat-face, and the feeder dies by a 3D FE analysis. They indicated that the metal flow and temperature in extruded products are more evenly distributed when using the die with a feeder.…”

Section: Die Designmentioning

confidence: 99%

Effects of Solid Die Types in Complex and Large-Scale Aluminum Profile Extrusion

Truong

Hsu²,

Tong

2019

Applied Sciences

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Increasing customer requirements for quality and productivity in extruding aluminum products has led to the development of different types of extrusion dies. In this study, three different types of dies, including traditional flat die, pocket die and spread die were designed to extrude complex and large-scale solid profiles. The design parameters for these dies were used from actual extrusion experience. The results obtained from steady-state simulation such as velocity, temperature, extrusion force, and die deformation were used to assess the advantages and disadvantages of the dies. Transient simulations were performed to analyze the evolution of transverse weld in the pocket and spread dies. The effects of ram speeds on the related extrusion parameters were also investigated. The research results provide useful guides for designers and engineers in selecting these types of extrusion dies. parameters of extrusion process can be obtained such as extrusion velocity, product temperature, die deformation, die stress, welding seam etc. [10][11][12]. studied. To balance the metal flow in the extrusion product, the dies were designed with a 3D model using practical experience parameters. After that, numerical simulations of extrusion were conducted by HyperXtrude 2017 software (Altair Engineering, Inc., Michigan, USA) with the Arbitrary Lagrangian-Eulerian (ALE) algorithm. The steady-state extrusion parameters, such as extrusion force, velocity, temperature, and die deformation, were investigated. The transient simulation is utilized to explore the evolution of transverse weld in the billet-to-billet extrusion process of the pocket, and the spread dies. Finally, the effects of ram speeds on the related extrusion parameters were examined. The advantages and drawbacks of these die types are analyzed and evaluated based on the obtained parameters from simulations.

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“…Sellars and Zhu [192] and Velay [219] described microstructural parameters in correlation to plastic strain and the temperature compensated Zener-Hollomon parameter. Thereby, an advanced thermo-mechanical coupled simulation delivers the misorientations, grain and subgrain sizes in addition to state-dependent variables.…”

Section: Number Of Standsmentioning

confidence: 99%

Metal forming beyond shaping: Predicting and setting product properties

et al. 2015

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Prediction and control of subgrain size in the hot extrusion of aluminium alloys with feeder plates

Cited by 11 publications

References 7 publications

Investigation of the Intermetallic Compounds Fragmentation Impact on the Formation of Texture during the as Cast Structure Thermomechanical Treatment of Aluminum Alloys

Investigation of the Intermetallic Compounds Fragmentation Impact on the Formation of Texture during the as Cast Structure Thermomechanical Treatment of Aluminum Alloys

Effects of Solid Die Types in Complex and Large-Scale Aluminum Profile Extrusion

Metal forming beyond shaping: Predicting and setting product properties

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