Ultrasonic Nano-Crystal Surface Modification Assisted Gas Nitriding of Ti6Al4V Alloy

2017 ◽  
Author(s):  
Jun Liu ◽  
Zhencheng Ren ◽  
Chi Ma ◽  
Yalin Dong ◽  
Chang Ye
Keyword(s):  
Surface Modification ◽  
Crystal Surface ◽  
Nitrogen Adsorption ◽  
Fold Increase ◽  
Compound Layer ◽  
Nitride Layer ◽  
Ti6al4v Alloy ◽  
Gas Nitriding ◽  
Treated Sample ◽  
Reaction Capability

The effects of Ultrasonic Nanocrystal Surface Modification (UNSM) on the gas nitriding of Ti6Al4V alloy has been investigated. The gas nitriding was performed at 700 and 800 °C. The microstructure after UNSM and gas nitriding was characterized using X-ray diffraction and scanning electron microscopy. Microstructural investigations revealed the formation of an approximately 10 μm thick severe plastic deformation (SPD) layer after UNSM treatment. After nitriding at 700 °C and 800 °C, a compound layer consisting of an approximately 0.2 μm and 1.9 μm thick nitride layer was observed in UNSM-treated Ti6Al4V alloy, which exhibits a nearly two-fold increase in nitride layer thickness as compared with the un-treated sample. This suggests that the nitrogen adsorption and the reaction capability are enhanced in the UNSM-treated Ti6Al4V alloy. This enhancement can be attributed to the high density dislocations and grain boundaries introduced by UNSM that serve as efficient diffusivity channels for interstitial gaseous atoms.

Surface nanocrystallization by ultrasonic nano-crystal surface modification and its effect on gas nitriding of Ti6Al4V alloy

2018 ◽  
Vol 736 ◽  
pp. 335-343 ◽  
Author(s):  
Jun Liu ◽  
Sergey Suslov ◽  
Azhar Vellore ◽  
Zhencheng Ren ◽  
Auezhan Amanov ◽  
...  
Keyword(s):  
Surface Modification ◽  
Crystal Surface ◽  
Ti6al4v Alloy ◽  
Surface Nanocrystallization ◽  
Gas Nitriding ◽  
Nano Crystal

Characteristics and Wear Performance of Nitrided Ti6Al4V

2012 ◽  
Vol 326-328 ◽  
pp. 494-497
Author(s):  
Fared Seahjani ◽  
Huseyin Cimenoglu
Keyword(s):  
Wear Resistance ◽  
Titanium Nitride ◽  
Coefficient Of Friction ◽  
Nitride Layer ◽  
Ti6al4v Alloy ◽  
Dry Sliding ◽  
Wear Performance ◽  
Gas Nitriding ◽  
Alumina Ball

Samples of a Ti6Al4V alloy were treated by thermochemical gas nitriding at 1120°C for 7 h. Gas nitriding provided formation of titanium nitride layer with a hardness over 1800 HV. The titanium nitride layer exhibited excellent wear resistance along with a lower coefficient of friction against alumina ball under dry sliding conditions when compared to the as-received state.

Improving surface finish and wear resistance of additive manufactured nickel-titanium by ultrasonic nano-crystal surface modification

2017 ◽  
Vol 249 ◽  
pp. 433-440 ◽  
Author(s):  
Chi Ma ◽  
Mohsen Taheri Andani ◽  
Haifeng Qin ◽  
Narges Shayesteh Moghaddam ◽  
Hamdy Ibrahim ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Surface Finish ◽  
Crystal Surface ◽  
Nickel Titanium ◽  
Nano Crystal

Electrically Assisted Ultrasonic Nanocrystal Surface Modification of Ti6Al4V Alloy

2017 ◽  
Vol 20 (1) ◽  
pp. 1700470 ◽  
Author(s):  
Jun Liu ◽  
Sergey Suslov ◽  
Shengxi Li ◽  
Haifeng Qin ◽  
Zhencheng Ren ◽  
...  
Keyword(s):  
Surface Modification ◽  
Ti6al4v Alloy ◽  
Electrically Assisted

Mechanical Behaviour of Gas Nitrided Ti6Al4V Bars Produced by Selective Laser Melting

2016 ◽  
Vol 704 ◽  
pp. 225-234 ◽  
Author(s):  
Peter Franz ◽  
Aamir Mukhtar ◽  
Warwick Downing ◽  
Graeme Smith ◽  
Ben Jackson
Keyword(s):  
Heat Treatment ◽  
Selective Laser Melting ◽  
Nitrided Layer ◽  
Xrd Analysis ◽  
Compound Layer ◽  
Processing Parameters ◽  
Heat Treatments ◽  
Laser Melting ◽  
Gas Nitriding ◽  
Heat Treated

Gas atomized Ti-6Al-4V (Ti64) alloy powder was used to prepare distinct designed geometries with different properties by selective laser melting (SLM). Several heat treatments were investigated to find suitable processing parameters to strengthen (specially to harden) these parts for different applications. The results showed significant differences between tabulated results for heat treated billet Ti64 and SLM produced Ti64 parts, while certain mechanical properties of SLM Ti64 parts could be improved by different heat treatments using different processing parameters. Most heat treatments performed followed the trends of a reduction in tensile strength while improving ductility compared with untreated SLM Ti64 parts.Gas nitriding [GN] (diffusion-based thermo-chemical treatment) has been combined with a selected heat treatment for interstitial hardening. Heat treatment was performed below β-transus temperature using minimum flow of nitrogen gas with a controlled low pressure. The surface of the SLM produced Ti64 parts after gas nitriding showed TiN and Ti2N phases (“compound layer”, XRD analysis) and α (N) – Ti diffusion zones as well as high values of micro-hardness as compared to untreated SLM produced Ti64 parts. The microhardness profiles on cross section of the gas nitrided SLM produced samples gave information about the i) microhardness behaviour of the material, and ii) thickness of the nitrided layer, which was investigated using energy dispersive spectroscopy (EDS) and x-ray elemental analysis. Tensile properties of the gas nitrided Ti64 bars produced by SLM under different conditions were also reported.

Investigation of the Compound Layer Formed by Steel 16MnCr5 After Gas Nitriding

2020 ◽  
Vol 9 (1) ◽  
pp. 1-3
Author(s):  
Naim Syla ◽  
Arbër Zeqiraj ◽  
Nazmi Hasi ◽  
Njomza Elezaj
Keyword(s):  
Compound Layer ◽  
Gas Nitriding

scholarly journals Surface modification of Ti6Al4V alloy scaffolds manufactured by electron beam melting

2019 ◽  
Vol 1145 ◽  
pp. 012030 ◽  
Author(s):  
E Chudinova ◽  
M Surmeneva ◽  
A Koptyug ◽  
K Loza ◽  
O Prymak ◽  
...  
Keyword(s):  
Surface Modification ◽  
Electron Beam ◽  
Electron Beam Melting ◽  
Ti6al4v Alloy

Improved tribological, electrochemical and biocompatibility properties of Ti6Al4V alloy by gas-nitriding and Ti–C:H coating

2015 ◽  
Vol 283 ◽  
pp. 70-79 ◽  
Author(s):  
W.H. Kao ◽  
Y.L. Su ◽  
J.H. Horng ◽  
H.C. Huang ◽  
S.E. Yang
Keyword(s):  
Ti6al4v Alloy ◽  
Gas Nitriding
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