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Effect of Diffusion Annealing on Borides Layers Produced on XC38 Steel

100%
Rayane K., Allaoui O., Allaoui A.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 3
521-523
EN
In this work, we present a study of the effect of diffusion annealing at 700°C for 1 h on the nature and properties of boride layers obtained on XC38 steel through a molten salt consisting of borax (Na₂B₄O₇) and boron carbide (B₄C). We evaluated the changes brought by the diffusion annealing on the morphology of the boride layer, the thickness of this layer, the distribution of elements in the steel, and the hardness. Comparing the results obtained allowed concluding that the diffusion annealing will completely transform the two-phase layer formed of FeB and Fe₂B borides in a single-phase layer consisting of single boride Fe₂B. The transformation of the two-phase boride into a single-phase boride is done with an increase in thickness of about 30% compared to the initial thickness of the sample. The values of Si concentration obtained in the underlying zone after the diffusion annealing treatment are more important than those obtained in the same underlying zone of samples borided directly by immersion in molten salt consisting of borax and silicon carbide (SiC).
2
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Effect of Boronizing on the Oxidation Resistance of 316L Stainless Steel

100%
Khenifer M., Allaoui O., Taouti M.
Acta Physica Polonica A
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2017
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vol. 132
|
issue 3
518-520
EN
The effect of boronizing treatment on oxidation at high temperature on 316L stainless steel was studied at 850, 900, 950, and 1000°C in air, for holding times between 0.25 and 24 h. The oxidation resistance of unboronized and boronized specimens was studied isothermally by thermogravimetric analyzer. The oxidation rate constant represented as a parabolic rate constant K_{p} was evaluated. Optical microscopy, X-ray diffraction, and the scanning electron microscopy were used for surface characterizations. The experimental results show that boronized coating increases the resistance of stainless steel 316l about twice and prevents oxygen from penetrating into the stainless steel substrate at the temperatures between 850 and 1000°C.
3
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Characterization of Alumina-Titania Coatings Produced by Atmospheric Plasma Spraying on 304 SS Steel

100%
Djendel M., Allaoui O., Boubaaya R.
Acta Physica Polonica A
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2017
|
vol. 132
|
issue 3
538-540
EN
The alumina-titania coatings produced by atmospheric plasma spraying are being developed for a wide variety of applications that require resistance to wear, erosion, cracking, and spallation. Consideration of parameters setting will develop reliable coatings with high performance properties for demanding coating application. Al₂O₃-3 wt% TiO₂ was used as the main coating. Ni 20%Cr₆Al powder was used as bond coat coating onto AISI 304 stainless steel substrate using Sulzer-Metco plasma spray system 9MC equipment.
4
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Production of Chromium Boride Layers on Carbon Steel with Conversion Treatment: Chromium Deposition + Diffusion Annealing

100%
Boubaaya R., Benarioua Y., Allaoui O., Djendel M.
Acta Physica Polonica A
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2017
|
vol. 132
|
issue 3
541-543
EN
The present study has been conducted in order to obtaining chromium boride layers on carbon steel using a conversion processing comprising the following steps: boriding treatment in order to increase the amount of boron atoms in the steel surface, deposition of a thin layer of pure chromium using electrolytic method, and finally an annealing treatment for boron diffusion and formation of boride layer until complete transformation of chromium layer. Depending on the method used (chromium deposition followed by boriding or boriding followed by chromium deposition) and the holding time, the partial or complete conversion is obtained as a result of the diffusion process. The role of the annealing temperature on transformation rates of chromium into chromium boride films was investigated. It is shown that for 1 h at 900°C, the chromium layer is totally transformed. The scanning electron microscopy analysis and X-ray diffraction showed the presence of CrB and CrB₂ chromium borides in addition of FeB and Fe₂B iron borides.
5
Content available remote

Surface Carburizing by Valorization of Organic Waste

100%
Boutessouna B., Allaoui O., Allaoui L.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 3
1173-1175
EN
The organic waste recycling problem remains an important economic issue for the industry, where much research is done in this area. In this study, we are interested in the enhancement of some organic waste from slaughterhouses (blood and horns) with two objectives: recycling wastes and producing cheap cement for surface carburizing. The waste is converted into coal and added to an activator to produce a solid medium, witch can be used for surface carburizing of carbon steels. Preparation of waste and physical and chemical carbonating of blood and horns resulted in production of coal, that was used as an effective carbon source for cementation treatment. Comparison of the obtained results with other works on carburizing treatment, using industrial solid mixtures, has shown that carburizing layers in both cases are very similar. Indeed, metallographic analysis, X-ray diffraction and Vickers hardness testing of obtained layers have led to results very similar to those in literature.
6
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Effect of Boriding on the Fatigue Resistance of C20 Carbon Steel

100%
Barkat A., Hammou A., Allaoui O.
Acta Physica Polonica A
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2017
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vol. 132
|
issue 3
813-815
EN
Boriding is a thermochemical surface treatment used to improve corrosion and wear resistance of hardened steels. In this work, we study the effect of boriding treatment in solid medium on the cyclic fatigue resistance of C20 carbon steel. Specimens of untreated and borided C20 steel in a solid medium consisting of 5% B₄C, 5% NaBF₄ and 90% SiC were subjected to rotating-bend fatigue device. The results showed that the improvement in fatigue resistance carried by the boriding treatment on C20 steel is low. This was explained by the presence of FeB boride in addition to Fe₂B boride, which leads to surface cracking.
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