Ultrasonic Impact Treatment of Fine- and Coarse Grained Commercial Purity Titanium

2016 ◽  
Vol 1139 ◽  
pp. 12-15
Author(s):  
Rustam Hairullin ◽  
Anna Kozelskaya ◽  
Marina Kazachenok
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Surface Layer ◽  
Electron Backscatter Diffraction ◽  
Coarse Grained ◽  
Commercial Purity ◽  
Ultrasonic Impact Treatment ◽  
Commercial Purity Titanium ◽  
Wide Range ◽  
Purity Titanium

The grain size effect on surface morphology, microstructure and mechanical properties of commercial purity titanium specimens subjected to ultrasonic impact treatment was studied. It was found by atomic force microscope that ultrasonic impact treatment of titanium specimens resulted in surface corrugation happens due to their severe plastic deformation. The profile height of the corrugated surface depends on the grain size of specimens and varies in a wide range. The thicknesses of a modified surface layer of fine-and coarse grained titanium specimens were studied. Electron backscatter diffraction (EBSD) analysis revealed that the plastic deformation was accompanied by twin and low angle boundary formation in the surface layer of titanium specimens. The effect of ultrasonic impact treatment on the microhardness of the surface layer of the specimens under study was investigated.

Structure fragmentation of a surface layer of commercial purity titanium during ultrasonic impact treatment

2015 ◽  
Author(s):  
Anna Kozelskaya ◽  
Alexey Panin ◽  
Marina Kazachenok ◽  
Rustam Hairullin ◽  
Elena Sinyakova ◽  
...  
Keyword(s):  
Surface Layer ◽  
Commercial Purity ◽  
Ultrasonic Impact Treatment ◽  
Commercial Purity Titanium ◽  
Purity Titanium

Effect of Ultrasonic Impact Treatment on Microstructure and Mechanical Properties of Commercial Purity Titanium

2016 ◽  
Vol 685 ◽  
pp. 330-333 ◽  
Author(s):  
Rustam Hairullin ◽  
Anna Kozelskaya ◽  
Marina Kazachenok
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Surface Layer ◽  
Residual Stresses ◽  
Coherent Scattering ◽  
Coherent Scattering Region ◽  
Commercial Purity ◽  
Ultrasonic Impact Treatment ◽  
Commercial Purity Titanium ◽  
Cp Ti

The paper presents a study of the ultrasonic impact treatment effect on the microstructure and mechanical properties of commercial purity titanium (CP-Ti). The texture, residual stresses, the size of coherent scattering region, the thickness of plastic deformation layer and the microhardness of CP-Ti specimens subjected to ultrasonic impact treatment were studied. It was found that ultrasonic impact treatment of CP-Ti specimens resulted in severe plastic deformation of their surface layer. The plastic deformation caused twin and low angle boundary formation in the surface layer. The last-named led to a crystallographic texture change, a decrease in the size of coherent scattering region, an increase in compressive residual stresses and a growth of microhardness of the surface layer of titanium specimens.

scholarly journals The Influence of Grain Size on Twinning and Microstructure Refinement During Cold Rolling of Commercial-Purity Titanium

2016 ◽  
Vol 47 (10) ◽  
pp. 5101-5113 ◽  
Author(s):  
S. V. Zherebtsov ◽  
G. S. Dyakonov ◽  
G. A. Salishchev ◽  
A. A. Salem ◽  
S. L. Semiatin
Keyword(s):  
Grain Size ◽  
Cold Rolling ◽  
Commercial Purity ◽  
Microstructure Refinement ◽  
Commercial Purity Titanium ◽  
Purity Titanium

Nanocrystalline Titanium Rods Processed by Hydrostatic Extrusion

2008 ◽  
Vol 584-586 ◽  
pp. 777-782 ◽  
Author(s):  
Krzysztof Topolski ◽  
Halina Garbacz ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Potential Application ◽  
Hydrostatic Extrusion ◽  
Coarse Grained ◽  
Commercial Purity ◽  
Application Range ◽  
Commercial Purity Titanium ◽  
Nanocrystalline Titanium ◽  
Metric Scale

The potential application range of coarse-grained commercial purity titanium is limited by its low mechanical properties. A reduction of the grain size of titanium leads to a significant increase in its strength and hardness. This paper is concerned with application of hydrostatic extrusion (HE) for fabrication nano-grained titanium. In the present study titanium rods were subjected to hydrostatic extrusion with the aim to reduce the grain size to the nano-metric scale and thereby improve the mechanical properties. The obtained material can be an equivalent and compete with the commonly used Ti6Al4V alloy. The results were compared with those other SPD techniques reported in the literature and refered to Hall-Petch relationship.

Grain Refinement in Commercial Purity Titanium Sheets by Constrained Groove Pressing

2011 ◽  
Vol 683 ◽  
pp. 233-242 ◽  
Author(s):  
G.V. Preetham Kumar ◽  
Ganesh G. Niranjan ◽  
Chakkingal Uday
Keyword(s):  
Plastic Deformation ◽  
Grain Refinement ◽  
Commercial Purity ◽  
Shear Deformations ◽  
Annealed Condition ◽  
Working Temperature ◽  
Warm Working ◽  
Commercial Purity Titanium ◽  
Significant Interest ◽  
Purity Titanium

Grain refinement studies in titanium have gained significant interest owing to its importance as a biomaterial. Severe plastic deformation techniques have been widely applied for grain refinement in metals and are capable of producing ultra fine and nano sized microstructures. In this study, repetitive shear deformations by constrained groove pressing have been applied to commercial purity titanium sheets of 2 mm thickness at a warm working temperature of 300oC. Microstructure studies reveal the formation of elongated grains with widths of the order of 0.5μm from an initial grain size of 40μm in the annealed condition. An increase in strength is also observed.

Twinning-Induced Formation of Nanostructure in Commercial-Purity Titanium

2014 ◽  
Vol 783-786 ◽  
pp. 2732-2737 ◽  
Author(s):  
Sergey V. Zherebtsov ◽  
G. Dyakonov ◽  
M. Klimova ◽  
Gennady A. Salishchev
Keyword(s):  
Grain Size ◽  
Beneficial Effect ◽  
Temperature Increase ◽  
Subgrain Size ◽  
Commercial Purity ◽  
Thickness Strain ◽  
Commercial Purity Titanium ◽  
Ultrafine Grained ◽  
Kinetics Of ◽  
Purity Titanium

In the present work the influence of various parameters on formation of nanoor ultrafine-grained structure in commercial-purity titanium during large deformation was quantified using TEM and EBSD. The beneficial effect of twinning on the kinetics of microstructure refinement in titanium was revealed. It was shown that deformation twinning (and therefore nanostructure formation) can be intensified via decrease in temperature, increase in the initial grain size and decrease in the impurities content. The minimum grain size at which twinning can still operate in commercial-purity titanium was determined to be ~1μm. It was shown that rolling to a thickness strain of 93% at-196°C resulted in the formation of a microstructure with a grain/subgrain size ~80 nm.

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