scholarly journals Novel Process Combined Extrusion And Severe Plastic Deformation For Plate Component With Rib-Web Structure of Magnesium Alloys

2021 ◽  
Author(s):  
Nanyang Zhu ◽  
Chaoyang Sun ◽  
Lingyun Qian ◽  
Mingjia Wang ◽  
Xintong Li
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Magnesium Alloys ◽  
Strain Distribution ◽  
High Performance ◽  
Effective Strain ◽  
Shear Plane ◽  
Longitudinal Section ◽  
Fe Model ◽  
Web Structure

Abstract Plates with rib-web structure of magnesium alloys can hardly fabricated through conventional method. In this work, the variable circular channel angular extrusion (VCCAE) combined extrusion and severe plastic deformation is proposed, in which billet undergoes severe deformation at several variable circular angular channel. The FE model for VCCAE of scaling plate with ribs is established and the experimental set up is designed. The feasibility of the novel process and the accuracy of the FE model are validated by the simulations and experiments. Stress state and the effective strain distribution in longitudinal section and cross section are analyzed. The results show that stress and strain distribution in longitudinal section is extremely inhomogeneous, and obvious stress concentration at the shear plane is founded. The microstructure in angular region is more uniform and finer, which validate that the severe shear deformation induced by the angular channel in the VCCAE process could promote the deformation uniformity and grain refinement. The results of numerical simulation and experiments demonstrate that the VCCAE process proposed in this paper is feasible and it has great potential to manufacture high-performance plate with ribs.

Research of Formation Mechanics on Nanostructured Chips by Multi-Deformations Based on Finite Element Method

2014 ◽  
Vol 989-994 ◽  
pp. 352-355
Author(s):  
C.L. Wu ◽  
Z.R. Wang ◽  
Wen Zhang
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Large Strain ◽  
Effective Strain ◽  
Longitudinal Section ◽  
Rake Angle ◽  
Governing Parameter ◽  
Cutting Velocity ◽  
Mean Strain

Formation of chip is a typical severe plastic deformation progress in machining which is only single deformation stage. The rake angle of tool is governing parameter to create large strain imposed in the chip. Effect of rake angle and deformation times on effective strain, mean strain, strain variety and strain rate imposed in the chip are researched respectively. The result of simulation have shown that the chip with large strain and better uniform of strain along the longitudinal section of chip can be produced with negative rake angle at some lower cutting velocity by multi-deformations in large strain machining.

Grain refinement of magnesium alloys processed by severe plastic deformation

2014 ◽  
Vol 24 (12) ◽  
pp. 3747-3754 ◽  
Author(s):  
Yong-jun CHEN ◽  
Qu-dong WANG ◽  
Jin-bao LIN ◽  
Man-ping LIU ◽  
Jarle HJELEN ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Magnesium Alloys

Research of magnesium alloys of the Mg-Sm-Y system subjected to severe plastic deformation and subsequent heat treatment

2011 ◽  
Vol 2011 (7) ◽  
pp. 629-633
Author(s):  
S. V. Dobatkin ◽  
L. L. Rokhlin ◽  
T. V. Dobatkina ◽  
N. I. Nikitina ◽  
I. E. Tarytina
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Magnesium Alloys ◽  
Subsequent Heat Treatment

Experimental and Numerical Investigations of the Plastic Deformation during Multi-Pass Asymmetric and Symmetric Rolling of High-Strength Aluminum Alloys

2014 ◽  
Vol 794-796 ◽  
pp. 1157-1162 ◽  
Author(s):  
Cun Qiang Ma ◽  
Long Gang Hou ◽  
Ji Shan Zhang ◽  
Lin Zhong Zhuang
Keyword(s):  
Plastic Deformation ◽  
Shear Strain ◽  
Strain Distribution ◽  
Effective Strain ◽  
High Strength ◽  
Equivalent Strain ◽  
Asymmetric Rolling ◽  
Element Simulation ◽  
Before And After ◽  
High Strength Aluminum Alloys

For understanding the distribution of plastic deformation induced by asymmetric rolling (ASR), multi-pass ASR and symmetric rolling (SR) experiments combined with the finite element simulation were used for high-strength aluminum alloy in the present study. The influence of reduction per-pass on the shear / effective strain distributions were studied via different ASR processes. By measuring the shear angle (θ, the angle between the reference mark before and after rolling) of rolled sheets, redundant shear strain and equivalent strain were calculated. It is shown that with equal total thickness reduction for ASR and SR, ASR can induce much more shear deformation through the thickness. By calculating the evolution of redundant shear strain and total equivalent strain for different ASR routines, it indicates that small pass reduction could be much favorable to the strain accumulation than that of the large pass reduction under a same total reduction in ASR process. Also, the influence of shear stress on the strain distribution and the through-thickness strain distribution were studied and evaluated with FEM analyses.

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