| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Li, Xiaoying
University of Birmingham
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2024Growth of Carbon Nanofibers and Carbon Nanotubes by Chemical Vapour Deposition on Half-Heusler Alloys
- 2022Nanoindentation of multifunctional smart compositescitations
- 2022Microscopic testing of carbon fiber laminates with shape memory epoxy interlayercitations
- 2021Development of surfaces with antibacterial durability through combined S phase plasma hardening and athermal femtosecond laser texturingcitations
- 2020A study on the effect of ultrashort pulsed laser texturing on the microstructure and properties of metastable S phase layer formed on AISI 316L surfacescitations
- 2020Comparative Physical–Mechanical Properties Assessment of Tailored Surface-Treated Carbon Fibrescitations
- 2019Corrosion Behavior of Active-Screen Plasma Nitrided 17-4 PH (H1150D) Steel in H2S/CO2-Containing Environmentscitations
- 2019Corrosion behavior of active-screen plasma nitrided 17-4 PH (H1150D) steel in H2S/CO2 -containing environments
- 2017Development and microstructure characterization of single and duplex nitriding of UNS S31803 duplex stainless steelcitations
- 2017Susceptibility of Plasma nitrided 17-4 PH to sulfide stress sracking (SSC) in H2S-containing environments
- 2017Scratch test of active screen low temperature plasma nitrided AISI 410 martensitic stainless steelcitations
- 2017Carbon nanofibers functionalized with active screen plasmadeposited metal nanoparticles for electrical energy storage devicescitations
- 2017Improving tribological and anti-bacterial properties of titanium external fixation pins through surface ceramic conversioncitations
- 2015Development of low-friction and wear-resistant surfaces for low-cost Al hot stamping toolscitations
- 2014Cavitation erosion resistance of active screen-low temperature plasma nitrided AISI 410 martensitic stainless steel
- 2014Cavitation erosion resistance and wear mechanisms of active screen low temperature plasma nitrided AISI 410 martensitic stainless steelcitations
- 2014Development of duplex high temperature gas nitriding and low temperature plasma nitriding surface treatments for UNS S31803 duplex stainless steel
- 2011Synthesis and characterization of W reinforced carbon coatings produced by Combined Magnetron Sputtering and Ion Implantation techniquecitations
- 2009CrN-based wear resistant hard coatings for machining and forming toolscitations
- 2004Plasma nitriding of low alloy sintered steels
- 2001Duplex surface treatment of high strength Timetal 550 alloy towards high load-bearing capacitycitations
Places of action
| Organizations | Location | People |
|---|
article
Development and microstructure characterization of single and duplex nitriding of UNS S31803 duplex stainless steel
Abstract
In this work, the development of a duplex nitriding (DN) surface treatment combining High Temperature Gas Nitriding (HTGN) and Low Temperature Plasma Nitriding (LTPN) is reported. The microstructure and hardness variation of the duplex treated steel is compared with the properties obtained during single HTGN and single LTPN of UNS S31803 stainless steel. Single LTPN of UNS S31803 was carried out in an Active Screen Plasma Nitriding reactor, at 400 °C for 20 h, in a 75% N2 + 25% H2 atmosphere. Single HTGN of UNS S31803 was carried out at 1200 °C, under a 0.1 MPa high purity N2 gas atmosphere, during 8 h. The developed duplex nitriding (DN) surface treatment consists of a combination of both, HTGN and LTPN treatments, carried out in the same conditions described above.<br/>The microstructure of the as received material was composed by ferrite and austenitic stringers, aligned in the rolling direction. The results showed that LTPN of the UNS S31803 duplex stainless steel promotes the formation of a duplex modulated structure composed by 2.5 μm thick, 1510 ± 52 HV hard, expanded ferrite (αN) regions, and 3.0 μm thick, 1360 ± 81 HV hard, expanded austenite (γN) regions on ferrite and austenite grains, respectively. Intense coherent ε-Fe3N nitride precipitation inside expanded ferrite was observed. ε-Fe3N nitrides precipitated with an orientation relationship [111] αN//[120] ε-Fe3N, leading to increased microhardness of the expanded ferrite regions. After the first step of the duplex nitriding treatment (HTGN) a 550 μm thick, 330 HV hard, nitrogen rich, fully austenitic layer formed at the surface of the specimens, by transformation of ferrite stringers into austenite. The second nitriding step (LTPN) led to the formation of a homogeneous expanded austenite layer, 1227 ± 78 HV on top of the thick fully austenitic layer, formed during the first step. The duplex treatment resulted in a more homogeneous, precipitate-free, microstructure and a better transition between the mechanical properties of the hardened outermost layer and the softer substrate.