Effects of Continuous Extrusion on Microstructure Evolution and Property Characteristics of Brass Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 2921-2924 ◽  
Author(s):  
Bing Li ◽  
Chun Hai Li ◽  
Xiang Jun Yao ◽  
Bao Yun Song
Keyword(s):  
Dynamic Recrystallization ◽  
Microstructure Evolution ◽  
Mechanical Treatment ◽  
Extrusion Process ◽  
Brass Alloy ◽  
Microstructure And Properties ◽  
Continuous Extrusion ◽  
Extruded Products ◽  
The Right

The continuous extrusion process would refine the microstructure effectively and increase the formability and properties of extrusion products, without preheating and post-mechanical treatment. During the continuous extrusion operation the microstructure of brass alloy significantly influences formability and properties. So the microstructure evolution rules of brass alloy during the whole continuous extrusion process were analyzed, and the hardness changing laws of the extruded brass alloy were also researched in this paper. By observing the microstructure evolution at different regions, the evolution rules of microstructure and properties of the continuous extrusion brass alloy were obtained. It was found that the dynamic recrystallization occurred at the right-angle bending region, which was proved by the hardness evolution of the extruded brass alloy. Therefore, it is feasible to control the properties of the extruded products by concentrating the right-angle bending region. This work gives the researching foundation of low formability materials based on continuous extrusion operation.

scholarly journals Characteristics of microstructure evolution of two-phase H62 brass alloy during continuous extrusion

2017 ◽  
Vol 207 ◽  
pp. 1123-1128
Author(s):  
Bing Li ◽  
Zikai Lin ◽  
Cheng Peng ◽  
Xue Wang ◽  
Jingfeng Zhang
Keyword(s):  
Microstructure Evolution ◽  
Brass Alloy ◽  
Two Phase ◽  
Continuous Extrusion

Microstructure Evolution of Copper Strip during Continuous Extrusion and Rolling Forming

2018 ◽  
Vol 913 ◽  
pp. 277-285
Author(s):  
Xin Bing Yun ◽  
Tian Tian ◽  
Hong Zhan ◽  
Cong Wang ◽  
Ying Zhao
Keyword(s):  
Dynamic Recrystallization ◽  
Microstructure Evolution ◽  
Shear Bands ◽  
Rolling Direction ◽  
Optical Microscope ◽  
Rolling Reduction ◽  
Fibrous Structure ◽  
Forming Process ◽  
Copper Strip ◽  
Continuous Extrusion

During the continuous extrusion and rolling forming process, the microstructure evolution of copper strip was investigated by the optical microscope and transmission electron microscope. The results indicated that the grains in the centre of as-cast rod billet were squashed in the clamping zone and were elongated in the rigid mobile zone. The fibrous structure formed in the upsetting zone. In the adhesion zone, the dynamic recrystallization occurred and the shear band was found. In the right-angle bending zone, the fibrous structure, recrystallized grains and shear bands existed together. The full dynamic recrystallization occurred in the extending extrusion zone. After continuous extrusion forming, the size of the grains of copper strip was larger than that in the extending extrusion zone. After rolling, the grains in copper strip were evidently stretched along the rolling direction, which resulted in the formation of stable direction. With the increase of rolling reduction, the grains were squashed gradually. When the rolling reduction increased from 2 to 6 mm, the tensile strength increased from 250 to 400 MPa, and the elongation decreased from 48% to 13%.

Microstructure evolution of Cu–0.2Mg alloy during continuous extrusion process

2015 ◽  
Vol 30 (18) ◽  
pp. 2783-2791 ◽  
Author(s):  
Yuan Yuan ◽  
Cheng Dai ◽  
Zhou Li ◽  
Guang Yang ◽  
Yue Liu ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Extrusion Process ◽  
Continuous Extrusion ◽  
Image Position

Abstract

Microstructure Evolution of AS41 Magnesium Alloy in ECAP

2021 ◽  
Vol 904 ◽  
pp. 65-69
Author(s):  
Zong Li Pi ◽  
Xiao Feng Zhang ◽  
Zhang Ling ◽  
Ying Long Li
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Microstructure Evolution ◽  
Shear Force ◽  
Extrusion Process ◽  
Cast Sample ◽  
Uniform Microstructure ◽  
Ecap Process ◽  
Cumulative Deformation

ECAP is a continuous multi-pass extrusion process that enables the specimen to obtain considerable cumulative deformation to refine the grain. In this paper, ECAP was used to deform AS41 magnesium alloy at 350°C, and the microstructure was observed and analyzed. The results show that the ECAP process has excellent effect on grain refinement and uniform microstructure. The grain size of AS41 decreases from 200μm to 20μm, and the microstructure is more uniform than that of as-cast sample. The reason is that the original grain is broken and refined under the action of shear force, and dynamic recrystallization occurs at the same time, resulting in small recrystallized grains. The Mg2Si particles were redistributed during ECAP and uniformly distributed in the crystal in rod shape.

Microstructure evolution and properties of Cu-Cr alloy during continuous extrusion process

2017 ◽  
Vol 703 ◽  
pp. 454-460 ◽  
Author(s):  
Yuan Yuan ◽  
Zhou Li ◽  
Zhu Xiao ◽  
Ziqian Zhao ◽  
Ziqi Yang
Keyword(s):  
Microstructure Evolution ◽  
Extrusion Process ◽  
Continuous Extrusion

Investigation of Conclad Extrusion and Multi-Billet Extrusion

2011 ◽  
Vol 491 ◽  
pp. 51-58 ◽  
Author(s):  
Michihiko Hoshino
Keyword(s):  
Life Cycle ◽  
Acid Rain ◽  
Experimental Method ◽  
Steel Wire ◽  
Extrusion Process ◽  
The Other ◽  
Welding Part ◽  
Continuous Extrusion ◽  
Extruded Products

In Nihon University, Conform continuous extrusion and new extrusion processes which are called multi-billet extrusion have been investigated last ten years. Conclad extrusion which was developed from Conform continuous extrusion[1], is applied to manufacturing trolley wire for train in Japan. The trolley wire which is copper covered steel wire has shorter life cycle than expected one because of corrosion for acid rain. The quality of welding part of copper must be improved. In this paper, it is investigated how to decrease involving oxide films in welding part by experimental method. On the other hand, the multi-billet extrusion[2] is applied to manufacturing automotive frames, especially impact attenuators. The developed extrusion process has been done under experimental condition. However, it is capable to vary geometries of rib which is in the inside of closed profile extruded products by this process.

Interfaces in Multiphase Polymers and Nanomedicines

2012 ◽  
Vol 714 ◽  
pp. 211-215 ◽  
Author(s):  
Gergo Patyi ◽  
Zsombor Nagy ◽  
Balazs Vajna ◽  
Peter Anna ◽  
Gyorgy Marosi
Keyword(s):  
Extrusion Process ◽  
Structural Features ◽  
Continuous Extrusion ◽  
Multiphase Composite

Crystalline and amorphous interfaces were formed and modified in multiphase composite and pharmaceutical systems. Nanosize drug of antacid effect was prepared in continuous extrusion process. The structural features were analyzed using (micro-) thermal analytical and (micro-) Raman spectrometric methods combined with chemometric evaluation.

Modeling and Simulation of Microstructure Evolution in Extruded Aluminum Profiles

2009 ◽  
Vol 424 ◽  
pp. 43-50
Author(s):  
Farhad Parvizian ◽  
T. Kayser ◽  
Bob Svendsen
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloys ◽  
Modeling And Simulation ◽  
Microstructure Evolution ◽  
Internal State ◽  
Extrusion Process ◽  
State Variables ◽  
Cooling Process ◽  
Microstructure Parameters ◽  
Simulation Results

The purpose of this work is to predict the microstructure evolution of aluminum alloys during hot metal forming processes using the Finite Element Method (FEM). Here, the focus will be on the extrusion process of aluminum alloys. Several micromechanical mechanisms such as diffusion, recovery, recrystallization and grain growth are involved in various subsequent stages of the extrusion and the cooling process afterward. The evolution of microstructure parameters is motivated by plastic deformation and temperature. A number of thermomechanical aspects such as plastic deformation, heat transfer between the material and the container, heat generated by friction, and cooling process after the extrusion are involved in the extrusion process and result in changes in temperature and microstructure parameters subsequently. Therefore a thermomechanically coupled modeling and simulation which includes all of these aspects is required for an accurate prediction of the microstructure evolution. A brief explanation of the isotropic thermoelastic viscoplastic material model including some of the simulation results of this model, which is implemented as a user material (UMAT) in the FEM software ABAQUS, will be given. The microstructure variables are thereby modeled as internal state variables. The simulation results are finally compared with some experimental results.

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