Microstructure and anisotropy of the mechanical properties in commercially pure titanium after equal channel angular pressing with back pressure at room temperature

Jäger, Aleš; Gärtnerová, V.; Tesař, Karel

doi:10.1016/j.msea.2015.07.038

Cited by 37 publications

(17 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Texture formed in subsequent passes in route A exhibit a similar trend observed in the case of Mg. In another study with the same die geometry by Jager et al, 43) the texture formed after 4th pass of ECAP by route A corroborated the results of this investigation. The only difference was due to the application of a back pressure between 270 and 590 MPa.…”

Section: Texture Evolution In Materials With C/a < 1633supporting

confidence: 87%

Texture Evolution in Severe Plastic Deformation Processes

Suwas

Mondal

2019

Mater. Trans.

View full text Add to dashboard Cite

Severe plastic deformation processes involve large grain rotations due to the action of different modes of plastic deformation and other microstructural changes which lead to characteristic texture formation. The present review deals with the evolution of texture during the most important severe plastic deformation processes, namely Equal Channel Angular Pressing (ECAP), High Pressure Torsion (HPT), Friction Stir Processing (FSP), Accumulative Roll Bonding (ARB) and Multi-Axial Forging (MAF). First three of the processes are shear based, while the latter two are plane-strain based. The textures formed during ECAP are visually different from simple shear textures due to (i) the inclination of the shear plane, (ii) additional contribution of non-shear based deformation. The relative intensities of texture components are function of deformation micro-mechanisms, amount of straining and configuration of the strain path. The texture evolved during HPT is very similar to simple shear texture, with additional consequences of microstructural changes that occur due to very large deformations. The textures formed in FSP process also resemble shear textures. On the other hand, texture evolution during ARB and MAF can be described using plane strain deformation. The present review deals with texture evolution during severe plastic deformation as a function of nature of processes and type of materials.

show abstract

Section: Texture Evolution In Materials With C/a < 1633supporting

confidence: 87%

Texture Evolution in Severe Plastic Deformation Processes

Suwas

Mondal

2019

Mater. Trans.

View full text Add to dashboard Cite

show abstract

“…In recent years, there is a high tendency to use commercially pure titanium (CP-Ti) which has a lower cost and a better-expected corrosion resistance than Ti-6Al-4V, but its yield strength and ultimate tensile strength are much lower [1,2]. At present, the mechanical properties of CP-Ti grades can be improved to the same or sometimes better than Ti-6Al-4V by grain refinement, commonly achieved via severe plastic deformation (SPD) methods [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the grain size of the 4th pass ECAP processed sample decreased to 150 nm from 25 μm and ultimate strength increased to 765 MPa from 485 MPa. Jager et al [3] performed four passes ECAP at room temperature on Grade 2 Ti using a die with channel angle of 90° in the presence of very high back pressure. After this procedure, they achieved a grain size of about 150 nm.…”

Section: Introductionmentioning

confidence: 99%

Processing and characterization of nanostructured Grade 2 Ti processed by combination of warm isothermal ECAP and extrusion

Eftekhari

Faraji

Nikbakht

et al. 2017

Materials Science and Engineering: A

View full text Add to dashboard Cite

In this study, combined multi pass equal channel angular pressing (ECAP), and subsequent warm extrusion at different temperatures are performed on commercial purity titanium. Mechanical and microstructural evolutions are then investigated. Since it was observed that the four passes ECAP processed sample showed the best strength and reasonable elongation, this sample was selected for studying the extrusion temperature effects on the structure and mechanical properties of Grade 2 titanium. Therefore, the 4th passes ECAP processed sample was extruded at different temperatures of 300 °C, 350 °C, 400 °C, 450 °C and 500 °C. The result revealed that the best mechanical properties were achieved from the specimen processed by four passes ECAP followed by warm extrusion at 300°C. The strength, and hardness of this sample were considerably improved in comparison with that of the unprocessed sample. Also, its ultra-fine grained and nanograined microstructure were homogeneous, with a grain size ranged from 40-200 nm with an average grain size of about 123 nm. It was seen that the mechanical properties of some samples after applying this combined process (ECAP + warm extrusion) are 2 comparable with those of Grade 5 titanium which is commonly used in medical applications but contains alloying elements that are toxic to human health.

show abstract

“…In the last two decades, many studies have appeared on the topic of ECAP processed titanium alloys. All investigations agreed that the ECAP method led to an ultra-fine grained (UFG) microstructure and enhanced strength [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 54%

Characterization of the Microstructure, Local Macro-Texture and Residual Stress Field of Commercially Pure Titanium Grade 2 Prepared by CONFORM ECAP

Németh

Horváth

Hervoches

et al. 2018

Metals

View full text Add to dashboard Cite

The paper investigated the residual strain and stress distribution, microstructure, and macro-texture along the transverse direction of commercially pure titanium grade 2 samples prepared by the CONFORM ECAP technique. This method belongs to the severe plastic deformation methods; hence, it could be assumed that residual stress fields would be present in the work-pieces. Residual stresses cannot be directly measured; thus, neutron diffraction measurements, Electron back-scatter diffraction (EBSD) investigations, and local X-ray macro-texture measurements were performed in different regions of the sample to determine the data for the residual stress calculation. The calculation was based on the modified Kröner model. Neutron diffraction strain scans and residual stress calculations revealed that symmetrical residual strain and stress gradients with compression character were present in the axial and hoop direction after one and two passes. Asymmetric distribution of the residual strains and stresses remained after the third pass of the CONFORM ECAP. EBSD investigations showed that after the first pass, significant grain refinement occurred; however, further passes did not cause any dramatic grain refinement. X-ray texture measurements revealed that local macro-texture was dependent on the number of passes of the CONFORM ECAP and on the investigated area in the samples.

show abstract

Microstructure and anisotropy of the mechanical properties in commercially pure titanium after equal channel angular pressing with back pressure at room temperature

Cited by 37 publications

References 26 publications

Texture Evolution in Severe Plastic Deformation Processes

Texture Evolution in Severe Plastic Deformation Processes

Processing and characterization of nanostructured Grade 2 Ti processed by combination of warm isothermal ECAP and extrusion

Characterization of the Microstructure, Local Macro-Texture and Residual Stress Field of Commercially Pure Titanium Grade 2 Prepared by CONFORM ECAP

Contact Info

Product

Resources

About