Torsion fatigue behavior of pure titanium with a gradient nanostructured surface layer

2016 ◽  
Vol 649 ◽  
pp. 359-368 ◽  
Author(s):  
Qi Wang ◽  
Qiaoyan Sun ◽  
Lin Xiao ◽  
Jun Sun
Keyword(s):  
Surface Layer ◽  
Fatigue Behavior ◽  
Pure Titanium ◽  
Nanostructured Surface

High Energy Shot Peening of Commercially Pure Titanium TIG Weld Joint

2010 ◽  
Vol 148-149 ◽  
pp. 659-663
Author(s):  
Chun Huan Chen ◽  
Rui Ming Ren
Keyword(s):  
Surface Layer ◽  
Weld Joint ◽  
Shot Peening ◽  
Welded Joint ◽  
Pure Titanium ◽  
High Energy ◽  
Commercially Pure Titanium ◽  
Nanostructured Surface ◽  
Commercially Pure ◽  
Cp Ti

Commercially pure Titanium (CP-Ti) TIG weld joint was treated by means of high energy shot peening (HESP) using a shot peening equipment commonly used in industry. The nanostructured surface layer was characterized by XRD, TEM, SEM and Microhardometer. The results showed that surface nanocrystallization of CP-Ti TIG weld joint were realized by high energy shot peening treatment. The finest grain size in the top surface layer is about 40nm. The hardness of the surface layer is enhanced significantly after shot peening compared with that of the as-welded joint, which resulted in a remarkable surface hardening effect. Surface welded defects such as air pores are eliminated successfully so that relative uniform surface layer was obtained.

scholarly journals Transformations of the Microstructure and Phase Compositions of Titanium Alloys during Ultrasonic Impact Treatment. Part I. Commercially Pure Titanium

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 562
Author(s):  
Alexey Panin ◽  
Andrey Dmitriev ◽  
Anton Nikonov ◽  
Marina Kazachenok ◽  
Olga Perevalova ◽  
...  
Keyword(s):  
Surface Layer ◽  
Phase Transformations ◽  
Pure Titanium ◽  
Surface Plastic ◽  
Commercially Pure Titanium ◽  
Ultrasonic Impact Treatment ◽  
Coordination Numbers ◽  
Microscopy Technique ◽  
Transmission Electron ◽  
Treated Sample

Experimental and theoretical studies helped to reveal patterns of surface roughening and the microstructure refinement in the surface layer of commercial pure titanium during ultrasonic impact treatment. Applying transmission electron microscopy technique, a gradient microstructure in the surface layer of the ultrasonically treated sample, where the grain size is varied from nano- to micrometers was revealed. It was shown that the surface plastic strains of the titanium sample proceeded according to the plastic ploughing mechanism, which was accompanied by dislocation sliding, twinning, and the transformations of the microstructure and phase composition. The molecular dynamics method was applied to demonstrate the mechanism of the phase transformations associated with the formation of stacking faults, as well as the reversible displacement of atoms from their sites in the hcp lattice, causing a change in coordination numbers. The role of the electronic subsystem in the development of the strain-induced phase transformations during ultrasonic impact treatment was discussed.

Low carbon steel with nanostructured surface layer induced by high-energy shot peening

2001 ◽  
Vol 44 (8-9) ◽  
pp. 1791-1795 ◽  
Author(s):  
G Liu ◽  
S.C Wang ◽  
X.F Lou ◽  
J Lu ◽  
K Lu
Keyword(s):  
Surface Layer ◽  
Carbon Steel ◽  
Shot Peening ◽  
Low Carbon Steel ◽  
High Energy ◽  
Low Carbon ◽  
Nanostructured Surface

Thermal Stability of 40Cr Steel with Surface Nanocrystallization

2006 ◽  
Vol 510-511 ◽  
pp. 434-437 ◽  
Author(s):  
Yu Liang Liu ◽  
Tian Ying Xiong ◽  
Ke Yang
Keyword(s):  
Thermal Stability ◽  
Surface Layer ◽  
Nanostructured Materials ◽  
High Thermal Stability ◽  
New Method ◽  
Nanostructured Surface ◽  
Surface Nanocrystallization ◽  
Nanostructured Layer ◽  
40Cr Steel ◽  
Thermal Stability Of

Surface Nanocrystallization(SNC) is a new method of fabricating nanostructured materials while thermal stability is an important problem for the application of nanostructured materials. A nanostructured layer was fabricated on the surface of 40Cr steel by Supersonic Particles Bombarding method, and the variation of microstructure and microhardness of nanostructured layer was studied. Nanostructured surface layer showed high thermal stability.

scholarly journals Electrochemical Surface Biofunctionalization of Titanium through Growth of TiO2 Nanotubes and Deposition of Zn Doped Hydroxyapatite

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 69
Author(s):  
Diana Maria Vranceanu ◽  
Elena Ungureanu ◽  
Ionut Cornel Ionescu ◽  
Anca Constantina Parau ◽  
Adrian Emil Kiss ◽  
...  
Keyword(s):  
Anatase Phase ◽  
Pure Titanium ◽  
Chemical Properties ◽  
Secondary Phase ◽  
Xrd Analysis ◽  
Electrochemical Treatment ◽  
Titania Nanotubes ◽  
Nanostructured Surface ◽  
Nanostructured Surfaces ◽  
Zn Content

The current research aim is to biofunctionalize pure titanium (Ti, grade IV) substrate with titania nanotubes and Zn doped hydroxyapatite-based coatings by applying a duplex electrochemical treatment, and to evaluate the influence of Zn content on the physico-chemical properties of hydroxyapatite (HAp). The obtained nanostructured surfaces were covered with HAp-based coatings doped with Zn in different concentrations by electrochemical deposition in pulsed galvanostatic mode. The obtained surfaces were characterized in terms of morphology, elemental and phasic composition, chemical bonds, roughness, and adhesion. The nanostructured surface consisted of titania nanotubes (NT), aligned, vertically oriented, and hollow, with an inner diameter of ~70 nm. X-Ray Diffraction (XRD) analysis showed that the nanostructured surface consists of an anatase phase and some rutile peaks as a secondary phase. The morphology of all coatings consisted of ribbon like-crystals, and by increasing the Zn content the coating became denser due to the decrement of the crystals’ dimensions. The elemental and phase compositions evidenced that HAp was successfully doped with Zn through the pulsed galvanostatic method on the Ti nanostructured surfaces. Fourier Transform Infrared spectroscopy (FTIR) and XRD analysis confirmed the presence of HAp in all coatings, while the adhesion test showed that the addition of a high quantity leads to some delamination. Based on the obtained results, it can be said that the addition of Zn enhances the properties of HAp, and through proper experimental design, the concentration of Zn can be modulated to achieve coatings with tunable features.

Investigation of Compound Layer Structures after Nitriding and Nitrocarburizing of Quenched and Tempered Steels

2021 ◽  
Vol 76 (3) ◽  
pp. 219-236
Author(s):  
M. Sommer ◽  
S. Hoja ◽  
M. Steinbacher ◽  
R. Fechte-Heinen
Keyword(s):  
Surface Layer ◽  
Phase Composition ◽  
Bulk Material ◽  
Fatigue Behavior ◽  
Nitrogen Concentration ◽  
Maximum Level ◽  
Compound Layer ◽  
X Ray Diffraction ◽  
Treatment Processes ◽  
Layer Structures

Abstract A compound layer is formed by ingress of nitrogen from an external nitrogen source into the surface layer and the formation of nitrides when the solubility of nitrogen in the bulk material is exceeded. In the surface layer, where the nitrogen concentration is at its maximum level, the nitrides form a closed layer. The compound layer continues to contain alloy nitrides which have formed from the carbides and other precipitates from the bulk material. The properties of the compound layer have a decisive influence on the wear and fatigue behavior of the loaded surfaces. The current investigations deal with the extensive characterization of compound layers that have been produced in heat treatment processes with the aim of producing stress-resistant nitriding layers. The commonly used nitriding and quench and temper (Q&T) steels 31CrMoV9 and 42CrMo4 served as examination material. The structure of the compound layers was varied within the nitriding trials regarding the phase composition, porosity and layer thicknesses. The phase composition of the compound layers was determined by special etching, scanning electron microscopy (SEM), X-ray diffraction and GDOES.

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