The effects of billet temperature on compound extrusion of magnesium alloy by three-dimensional finite element modeling and experiments

Using biodegradable magnesium microtubes for producing vascular stent have received a great deal of attention during the last decade. However, poor workability and low mechanical properties of Mg and its alloys pose an obstacle to manufacturing microtubes for stent application. In this article, a combined method including equal channel angular pressing), direct extrusion, and microtube extrusion processes are employed to produce WE43 magnesium microtubes. Thus, microtubes with an outside diameter of 3.3 mm and a wall thickness of 0.22 mm are successfully manufactured. The results demonstrate a significant improvement in mechanical properties and microstructure of the processed samples. The ultimate strength and elongation are increased from 240 MPa and 6% to 340 MPa and 20% in the final microtube, respectively. In addition, the microhardness of the final microtube is enhanced from an initial value of 85 Hv to 102 Hv and the grain size is reduced to 3.5 µm from the initial value of 135 µm. Therefore, the proposed method overcomes the poor formability of Mg alloy and can be used to fabricate high-strength microtubes with ultrafine-grained structure.

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“…Therefore, the processed material by a combination of ECAP and extrusion exhibits an excellent balance of strength and tensile ductility. 43…”

Section: Resultsmentioning

confidence: 99%

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

Amani

Faraji

Mehrabadi

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The output of the network is the breakthrough extruding force. The temperature has a significant effect on the forming force, 13 especially the breakthrough extruding force, which directly affects the constitutive relationship of the material, that is, the flow stress of the billet deformation. The surface temperature of the billet before extrusion directly affects the plastic deformation.…”

Section: Prediction Modelmentioning

confidence: 99%

Prediction of breakthrough extruding force in large-scale extrusion process using artificial neural networks

Wei

Chaolong

et al. 2021

Science Progress

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Accurate prediction of breakthrough extruding force is very important for extrusion production, especially for the large-scale extrusion process, which directly affects the production costs and safety. In this paper, based on the production data of the 360-million-newton-tonnage extruding machine, an artificial neural network (ANN) algorithm is used to establish the breakthrough extruding force prediction model for the large-scale extrusion process, and the calculation results are validated. Results show that the proposed model has high accuracy, and the average relative error between the predicted and experimental values is only 1.79%. Further, problems that are difficult to quantitative analyze such as die wear and glass powder residue in actual production, which can be regarded as “noises,” are studied. Finally, the model presented is compared with the traditional finite element (FE) model. The accuracy of the ANN model is 10.2 times that of the FE model. Thus, the model established in the study fully considers the difference between actual production and theoretical analysis and provides an effective method for accurately predicting the breakthrough extruding force.

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A special extrusion-shear manufacturing method for magnesium alloy rods based on finite element numerical simulation and experimental verification

Zhang

Huang

Zhao

et al. 2023

Int J Adv Manuf Technol

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To research the in uences of process parameters on a special extrusion-shear manufacture method for magnesium alloy rods, deform-3d software with nite element simulations has been used to analyze the material ows of deformed magnesium alloys AZ31B during the extrusion-shear (ES) process, as well as the grain sizes and distribution of extrusion loads, stresses and strains, and blank temperatures. Temperature elds, stress elds, strain elds and temperature elds varying with different blank preheating temperatures, extrusion speed and extrusion ratios were simulated. In uences ofdifferent extrusion conditions and different die structures on microstructures of rods prepared by ES process has been researched. Extrusion forces decrease with the increasing extrusion temperatures, decreasing extrusion ratios, increasing die channel angles and decreasing friction coe cients. The ow velocities of metal in the ES die increase with development of ES process. Increasing the channel angles and reducing the friction factors would increase the out ow velocities of metal, but it has little effect on the uniformity of metal ow. The increase in friction and extrusion speed would increase the temperatures of the ES die.The ES process can prepare ner and more uniform microstructures than those prepared by direct extrusion under the same conditions.

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The effects of billet temperature on compound extrusion of magnesium alloy by three-dimensional finite element modeling and experiments

Cited by 8 publications

References 13 publications

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

Manufacturing and mechanical characterization of Mg-4Y-2Nd-0.4Zr-0.25La magnesium microtubes by combined severe plastic deformation process for biodegradable vascular stents

Prediction of breakthrough extruding force in large-scale extrusion process using artificial neural networks

A special extrusion-shear manufacturing method for magnesium alloy rods based on finite element numerical simulation and experimental verification

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