Numerical Investigation on Strain Properties of Ti6Al4V Alloy Processed by Constrained Bending and Straightening Severe Plastic Deformation

2019 ◽  
Author(s):  
W. M. Mwita ◽  
E. T. Akinlabi
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Numerical Investigation ◽  
Continuous Production ◽  
Ti6al4v Alloy ◽  
Continuous Processing ◽  
Metal Sheets ◽  
Strain Magnitude ◽  
Constrained Bending ◽  
Number Of Passes

Abstract This paper presents a numerical investigation on strain properties of Ti6Al4V alloy processed by constrained bending and straightening (CBS) severe plastic deformation (SPD) technique. CBS is a new SPD method that has been proposed to enhance continuous processing of metal sheets and improve magnitude and homogeneity of induced properties such as strain. The model considers a rectangular sheet of Ti6Al4V alloy processed with CBS at 2, 4 passes denoted as N2, N4 each combined with 10, 5, 3 mm feed length denoted as F10, F5, F3 respectively. ABAQUS Standard FEA Software was used to simulate and investigate the magnitude and homogeneity of equivalent plastic (EP) strain induced in material. Results show that for all feeds, magnitude values of EP strain at N4 passes were higher than those at N2 passes. The magnitude of EP strain increased with the number of passes. Values of both magnitude and homogeneity of EP strain were highest at F3 feed followed by those at F5 and F10 feeds respectively. The study has promised that CBS is the potential process for continuous production of metal sheets with improved EP strain magnitude and homogeneity.

scholarly journals The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2241 ◽  
Author(s):  
Garima Kapoor ◽  
Tibor Kvackaj ◽  
Anita Heczel ◽  
Jana Bidulská ◽  
Róbert Kočiško ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Dislocation Density ◽  
Severe Plastic Deformation ◽  
Crystallite Size ◽  
Liquid Nitrogen Temperature ◽  
Apparent Contradiction ◽  
Angular Pressing ◽  
Cu Alloy ◽  
Average Size ◽  
Number Of Passes

A Cu–1.1%Cr–0.04%Zr (wt.%) alloy was processed by severe plastic deformation (SPD) using the equal channel angular pressing (ECAP) technique at room temperature (RT). It was found that when the number of passes increased from one to four, the dislocation density significantly increased by 35% while the crystallite size decreased by 32%. Subsequent rolling at RT did not influence considerably the crystallite size and dislocation density. At the same time, cryorolling at liquid nitrogen temperature yielded a much higher dislocation density. All the samples contained Cr particles with an average size of 1 µm. Both the size and fraction of the Cr particles did not change during the increase in ECAP passes and the application of rolling after ECAP. The hardness of the severely deformed Cu alloy samples can be well correlated to the dislocation density using the Taylor equation. Heat treatment at 430 °C for 30 min in air caused a significant reduction in the dislocation density for all the deformed samples, while the hardness considerably increased. This apparent contradiction can be explained by the solute oxygen hardening, but the annihilation of mobile dislocations during annealing may also contribute to hardening.

Effect of Process Parameters on Microstructure and Mechanical Properties on Severe Plastic Deformation Process of Aa7075-T6 Aluminum Alloy

2012 ◽  
Vol 622-623 ◽  
pp. 705-709 ◽  
Author(s):  
U. Mohammed Iqbal ◽  
V.S. Senthil Kumar
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Equal Channel Angular Extrusion ◽  
Extrusion Process ◽  
Angular Pressing ◽  
Twist Extrusion ◽  
Number Of Passes

Severe plastic deformation is one of the emerging and promising techniques applied to bulk materials to produce fine grain structure with attractive properties. This study aims to investigate the effect of extrusion parameters like extrusion temperature, number of passes on the equal channel angular pressing and twist extrusion forming behavior of AA7075-T6 Aluminum alloy by hot extrusion process. AA7075-T6 samples of 70x28x18 mm cross sections extruded by equal channel angular pressing and twist extrusion process was subjected to microstructure analysis, hardness and tensile tests in order to determine their mechanical properties. As a result of the experiments, it was determined that twist extrusion leads to more grain refinement at high temperatures with more number of passes compared to equal channel angular pressing. SEM micrographs show that there is severe orientation of the grains facilitated by the extrusion process which enhances the strength. The dense banding of the grains had effected in marginal hardness enhancement in the matrix of the specimens processed by twist extrusion and equal channel angular extrusion process.

Microstructure Homogeneity in AA6063 Alloy Processed by Cyclic Expansion Extrusion

2018 ◽  
Vol 385 ◽  
pp. 223-227 ◽  
Author(s):  
V. Babu ◽  
S. Balasivanandha Prabu ◽  
K. Anantha Padmanabhan
Keyword(s):  
Plastic Deformation ◽  
Tensile Strength ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Parent Material ◽  
High Angle ◽  
Extrusion Die ◽  
Microstructure Examination ◽  
Aa6063 Alloy ◽  
Number Of Passes

Aluminium (AA6063) alloy was subjected at 200oC to cyclic expansion extrusion (CEE) - a severe plastic deformation (SPD) process - up to 10 passes. The extrusion die angle is 22.5o. Microstructure examination revealed evidence for grain refinement, which had reduced from 20μm±5.8 (average) in the parent material to 4.8 μm±1.4 (average) after 10 passes (i.e. ~76% of reduction). The microhardness and tensile strength had increased, while the elongation decreased with the number of passes. The specimen after 4 passes had the highest hardness of 591 HV (about 40% improvement) and the highest tensile strength value of 153 MPa which is ~23% more than that of the parent material. The hardness and tensile strength values decrease marginally on further processing, although throughout they are higher than that of the parent material. With increasing of number of passes, grain refinement and the fraction of high-angle boundaries continued to increase, which in the end was ~ 40%.

MICROSTRUCTURAL EVOLUTION OF AZ31 MAGNESIUM ALLOY PROCESSED BY A NEW NOBLE SEVERE PLASTIC DEFORMATION METHOD

2012 ◽  
Vol 05 ◽  
pp. 316-324
Author(s):  
S.M. FATEMI-VARZANEH ◽  
A. ZAREI-HANZAKI ◽  
R. VAGHAR
Keyword(s):  
Plastic Deformation ◽  
Magnesium Alloy ◽  
Severe Plastic Deformation ◽  
Shear Banding ◽  
Second Step ◽  
Deformation Method ◽  
Homogeneous Microstructure ◽  
Fine Grain ◽  
Nucleation Sites ◽  
Number Of Passes

A new noble severe plastic deformation method, called accumulative back extrusion (ABE), was developed to assist generating ultra fine grain materials. In the present work the ABE process was successfully applied on AZ 31 magnesium alloy up to three passes without any danger of cracks. The results showed that a large shear deformation may introduce through step one, where extensive shear banding and twinning are present in the microstructure. As the second step proceeds via constrained compressive deformation, more deformation inhomogenieties, which may act as preferred nucleation sites for new grains, were introduced in the microstructure. By increasing the number of passes to 3, more homogeneous microstructure with no significant smaller grain size was formed. The strain induced twinning and strain localization, which were led to occurrence of dynamic recrystallization (DRX), were found to be the main reasons of grain refinement during ABE process.

Structure and Mechanical Properties of Submicrocrystalline Copper Produced by ECAP to Very High Strains

2006 ◽  
Vol 503-504 ◽  
pp. 971-976 ◽  
Author(s):  
Alexei Vinogradov ◽  
T. Suzuki ◽  
Satoshi Hashimoto ◽  
Kazuo Kitagawa ◽  
A.A. Kuznetsov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Strain Path ◽  
Tensile Ductility ◽  
Tensile Behavior ◽  
Number Of Passes ◽  
Very High ◽  
Thermal Stability Of

The present work is aimed at linking the microstuctutral features obtained after severe plastic deformation via ECAP to the tensile behavior and thermal stability of pure (99.98%) copper processed by routes A and Bc to different number of passes. The main conclusion one can draw unambiguously from the currently available results is that the strain path exerts relatively little effect on the resultant tensile properties when the number of pressing is sufficiently large, although there have been some marked differences in crystallographic textures and distribution of grain-boundaries. The effect of the number of pressings on the tensile ductility is considerable.

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