Browsing by Author "Saoudi Abdenour"

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    Effect of Film Thickness on the Structural and Tribo-Mechanical Properties of Reactive Sputtered Molybdenum Nitride Thin Films
    (Metallurgical and Materials Engineering Association of Metallurgical Engineers of Serbia AMES, 2022-06-05) Abboudi Abdelaziz; Aissani Linda; Saoudi Abdenour; Djebaili Hamid
    The current study aims to examine the impact of nitrogen content and film thickness on the structural and tribo-mechanical characteristics of reactive sputtered MoN thin films. Molybdenum nitride thin films with thicknesses ranging from 0.2 to 1.25 m have been applied to steel and silicon substrates for this purpose, with various amounts of controlled atmosphere (Ar+N2). Then, the films are characterized using XRD (X-ray diffraction), EDX (energy dispersive X-ray analysis), SEM (scanning electron microscopy), FTIR (Fourier-transform infrared spectroscopy), and nanoindentation. The residual stress was measured using the Stoney formula. Results show that a high compressive residual stress of -5.7 GPa is present in the film with a 0.3 μm thickness and gradually decreases with increasing film thickness. Above 1 µm of film thickness, there is no change in the density of the MoN films. Also, the coating hardness and Young’s modulus vary between 9.5 and 35 GPa, and 266 and 320 GPa, respectively, depending on nitrogen content and film thickness. Lastly, the friction of the MoN thin films is estimated to be around 0.55, which proves that the oxide is being slowly removed.
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    Effect of Reinforcing Particle Shape on the Behavior of Composites Materials
    (JOURNAL OF NANO- AND ELECTRONIC PHYSICS, 2021-12-02) Mansouri Khelifa; Chermime Brahim; Saoudi Abdenour; Djebaili Hamid
    In this paper, the effect of particle shape on the mechanic behavior of glass particle reinforced composites is evaluated. Small particles adhere strongly to the polymer, which leads to a strong reinforcing effect. When the total contact surface increases, more loads are transferred to the reinforcing particles. In our previous studies, it has been shown that addition of circular particles with decreasing diameter does not affect the composite. The objective of this research is to investigate the mechanical behavior of thermoplastic matrix composite nylon 66, reinforced with glass particles, under unidirectional tensile loading using finite element analysis. Numerical results are presented for a variety of particle shapes, including circular, triangular, square, rhombic, pentagonal and hexagonal. The results show that Von Mises stresses consistently increased as the shape of the reinforcing particles changed from triangular to square, rhombic, pentagonal, hexagonal and circular in this order.
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    Influence of the carburization time on the structural and mechanical properties of XC20 stee
    (Mater. Res. Express, 2021-08-21) Saoudi Abdenour; Aissani Linda; Chahaoui Oualid; Bestandji Ali; Louafi Med Salah; Djebaili Hamid
    This study focuses on the effect of carburization time on the structural and mechanical properties of low carbon XC20 mild steel(C. Wt.% <0.25). The XC20 steel was carburized with activated carbon with a carbon potential Cp1 = 1.1%, at 910 °C at different carburization times of 2, 4 and 6 h. The results obtained show that XC20 steel(non-carburized) has a ferrite-pearlitic structure with a hardness and a Young’s modulus of the order of (150 HV, 26 KN/mm2 ). After carburization, the structure of the carburized layer is transformed in martensite (Fe γ)in which cementite (Fe3C)is imbricated. The depth of the carburized layer and the amount of carbon on the surface gradually increase with increasing carburization time. In addition, the carburized XC20 steel becomes hard and brittle where the hardness and Young’s modulus have been increased for a high holding time until reaching maximum values(845 HV, 48 KN mm−2 ) after 6 h of carburization . However, the toughness of XC20 steel has been reduced from 163 to 40 J cm−2 .
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    THE INFLUENCE OF SALT BATH NITRIDING VARIABLES ON HARDNESS LAYER OF AISI 1045 STEEL
    (Acta Metallurgica Slovaca,, 2016-09-27) Ghelloudj Elhadj; Djebaili Hamid; Hannachi Med Tahar; Saoudi Abdenour
    The aim of this paper is to study and analyze the effects of a surface controlled salt bath nitriding on the microhardness of AISI 1045 steel. The nitriding process was implemented in the salt bath component at ten different times (from 1 h to 10 h) when the temperature was constant at (520ºC). The nitriding process repeated of other specimens at the same times, but the temperature was (580ºC).The microstructure of the surface layers was investigated by scanning electron microscopy (SEM) and optical microscopy. Hardness profiles were measured with lowload hardness testing to determine the growth of the case depth after nitriding. Microhardness testing was carried out on samples to investigate the hardness profile at the transition from the compound to the diffusion layer. The microhardness of the surface of the nitrided sample at 520ºC and 580ºC was observed in the range of 318–430 HV0.3 and 329–421 HV0.3, respectively. Experimental results showed that the nitrides ε-Fe2-3(N, C) and γ’-Fe4(N,C) present in the compound layer increase the microhardness , It also showed that the Increasing the salt bath nitriding parameters (treatment time and temperature) increases the surface hardness and hardness profile.