ABDELGHANI Belhocine

Benshil souheil

Conception et réalisation d'un outil de moletage

Taibi Abdelhak , Moussai Choaib

DIAGNOSTIC D’UN MOTEUR HDI SUBIT UN MODE DÉGRADÉ A HAUT RÉGIME

Badza Taqiyeddin , Guendouz Azeddine

Montage d'usinage d'une pièce tournante

Cet article présente une série de traitements thermiques appliqués à un acier fortement allié préalablement recouvert de chrome dans un bain électrolytique, avec une couche d'environ 10 μm, dans le but d'obtenir une couche de carbure de chrome aux bonnes propriétés mécaniques et physico-chimiques. Un recuit de diffusion à 1000 et 1100 °C pendant 1 heure et 2 heures a permis d'obtenir des couches de carbure de chrome adhérentes, uniformes et présentant une très haute dureté. Ces résultats ont été confirmés par des moyens de caractérisation tels qu'un microscope optique, un duromètre et un diffractomètre, utilisés pour déterminer les phases naissantes de ce cycle de traitement.

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Omar Allaoui, Haoues Ghouss, ,(2525-10-29), Caractérisation de couches minces de chrome déposées sur un acier fortement allié après recuit de diffusion,1sh National Seminar on Structural Mechanics and Materials (SNMSM 2025). 29-30 October 2025: M’sila, Algeria,msila ,algeria

Resistance spot welding is a fast and widely used technique for joining stainless steel sheets. The process involves passing a high-intensity electric current through the parts held under pressure between two electrodes. Joule heating leads to the formation of a molten zone, called the nugget, which ensures the bonding between the sheets. In this work, ferritic stainless steel AISI 430 sheets were joined by spot welding under variable welding conditions. The influence of welding current intensity and holding time on the microstructure and mechanical properties of the welded joints was investigated. Tensile tests and microhardness measurements were carried out to characterize the mechanical strength and fracture mode of the welds. The results reveal that nugget size, tensile strength, and microhardness distribution are strongly dependent on the welding parameters. Microstructural analysis made it possible to interpret the metallurgical transformations generated during the process.

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Omar Allaoui, Haoues Ghouss, ,(2025-10-29), effect of welding parametres on the microstructure and mechanical proprieties of resistance spot welded AISI 430 stainless steel sheets,1 st National seminar on structural mechanics and materials (SNMSM'25) october 29-30th, 2025,msila ,algeria

– This research addresses the critical need to optimize weld integrity in IN-738 LC, a nickel- based superalloy widely used in high-temperature aerospace and industrial applications. The study examines the effect of post-weld heat treatment (PWHT) on the microstructural evolution and mechanical properties of welded joints. A comprehensive methodology is employed, combining advanced welding techniques with systematic heat treatment protocols. Microstructural characterization is carried out using scanning electron microscopy methods, while mechanical properties are evaluated through tensile testing. The findings reveal a strong correlation between PWHT parameters and the resulting microstructure, which significantly influences the mechanical of the welded joints. Optimizing PWHT enhances creep resistance and fatigue life, both of which are critical for the longevity and reliability of components operating under extreme conditions. These results provide practical guidelines for improving welding procedures for IN-738 LC, contributing to greater component durability and reduced operational costs

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Haoues ghouss, Lamboub samia, Benlmnouar Farid, Ziam Aymen, ,(2025-10-29), Post-Weld Heat Treatment Effects on The Microstructure and Mechanical Behavior of In-738 Lc Joints,1 sh National Seminar on Structural Mechanics and Materials (SNMSM 2025). 29-30 October 2025: M’sila, Algeria,msila ,algeria

A number of deposition processes can be utilized to produce transition metal carbide and nitride coatings. The choice of the deposition process is determined by various parameters, such as coating thickness, use of the deposit, adhesion of the deposit to the substrate, and production cost. In this study, hard chromium carbide coatings are prepared through a conversion treatment on 100Cr6 and X200Cr12 steels. This process consists of electrode position of chromium on the surface of 100Cr6 and X200Cr12 steels followed by a diffusion annealing treatment at 1000 °C and 1100 °C for 1 and 2 hours. All the conversion treatments conducted result in a chromium carbide layer formation on the steel surface. The constituting phases of the formed layer depend on the temperature of the diffusion annealing treatment and the duration at this temperature. In addition, the X-Ray Diffraction (XRD) analysis confirms the presence of chromium oxide in addition to chromium carbides. The micro-hardness profile indicates that both samples attain high hardness values, which are more than four times higher than the base substrate hardness. A well-defined transition zone is also observed, offering the highest adhesion between the deposited layers and the substrate. Scratch tests, in addition to micro-hardness values, determine the improved performance of the X200Cr12 steel sample.

Citation

Abdelghani Belhocine , , (2025-04-14), Characterization of Microstructure and Mechanical Properties of Chromium Carbide Coatings Formed on 100Cr6 and X200Cr12 Steels through Conversion Process, Engineering, Technology & Applied Science Research, Vol:15, Issue:3, pages:7, DTEK Greece

Electric resistance spot welding is a simple and fast process that is widely applied on stainless steel sheets. During this process, a high electric current flows between the electrodes through the pressure parts. By the Joule effect, a nugget of molten solder is formed between the welded parts. In this study, AISI 430 ferritic stainless steel sheets were spot welded by electrical resistance with different welding parameters. The effect of the welding current and the holding time during welding on the microstructure and the mechanical properties of the welded joints have been investigated. Tensile tests and micro hardness measurements were carried out to assess the mechanical properties and the breaking characteristics of the welded joints. The obtained results show that the nugget size, the tensile strength of the welded sheets and the micro hardness distribution depend on the welding parameters. The micro structural study allowed us to explain the transformations produced during welding.

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Hani BENGUESMIA , omar allaoui, , (2024-06-06), Microstructural and mechanical characterization of spot welds on AISI 430 ferritic stainless steel sheets, PRZEGLĄD ELEKTROTECHNICZNY, Vol:100, Issue:6, pages:4, ISSN (https://portal.issn.org/)

Carbides of transition metals are widely used due to their interesting properties. Several deposition methods and techniques can be used to produce carbide coatings. The choice of coating technique depends on several parameters such as, the conditions of use of these deposits, the thickness to be produced, the adhesion between the substrate and the deposit,… In this work, hard coatings of chromium carbide were produced by a conversion treatment on 100Cr6 and X200Cr12 steels. The conversion treatment consists of electrodeposition of chromium on the surface of 100Cr6 and X200Cr12 steels followed by diffusion annealing treatment at 1000 and 1100 °C for holding times of 1 and 2 hours. The obtained results show that, for all the conversion treatments carried out in this work, there was formation of chromium carbides layer on the surface of steel. However, it should be noted that the nature of the constituting phases of the formed layer depends on the temperature of the diffusion annealing treatment and the duration at this temperature. The microhardness profile and the scratch test show that the X200Cr12 steel sample shows better results.

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Omar Allaoui, ,(2023-10-27), mechanical characterization of carbide layers obtained on 100cr6 and x200cr12 steels by conversion treatment,10th International Conference Computational and Experimental Science and Engineering,Antalya, Turhey

This article presents a series of heat treatments on a low-alloy steel 100cr6 previously coated with chromium in an electrolytic bath with a layer of approximately 10 mµ, in order to obtain a layer of chromium carbide with good mechanical and physicochemical properties, a diffusion annealing of 1000 and 1100 ° C while 01 hour and 02 hours capable of offering uniform adherent chromium carbide layers and very high hardness which were confirmed by the characterization means, an optical microscope, a durometer and a diffractometer to determine the nascent phases of this treatment cycle.

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Omar Allaoui, Haoues Ghouss, ,(2020-09-25), Obtaining and characterizing chromium carbide on 100 cr6 steel,9 ème Journées des Sciences Ingénieur JSI -27, 2020, Sfax, Tunisia Conference and Forum on Engineering Science,TUNISI

Because of their superior mechanical and corrosion properties, ferritic stainless steel AISI 430 is widely used in the industry. Resistance spot welding is the most commonly used method for joining sheet metal materials. The influence of the primary welding parameters (welding current, holding time) affect the melting temperature of the welded zone which will modify the surface appearance, weld nugget size, penetration of the electrode , the internal discontinuity of the weld. This paper presents a study at the microstructure level to determine the phase transformations that occur during the thermal welding cycle and the mechanical properties of the welded points including tensile shear load capacity.

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Omar Allaoui, Mokhtar Djendel, ,(2019-12-19), Study of the Transformation of metallographic and mechanical properties resulting from spot welding of metal 430 AISI ferritic stailess steel,the Fifth International Conference on Mechanics and Energy ICME' 2019 Decembre 19-21 Monaster Tunisia,TUNISI

This document has essentially consisted in presenting a recent technique that allows the performance of tool steels to be increased by the creation of chromium carbide having hig chh aracteristics. In fact, after electrolytic deposition of a thin layer of pure chromium with a mean thickness of 10 ?m, on the steels Z210Cr12 and 100Cr6, the samples (layer / substrate) were annealed in the interval (1000 - 1100 C° ). In this temperature range, the deposited film is graduall cyo nverted into chromium carbide. The phase transformation that took place mainly by substrate carbon diffusion in the lay ewr as determined by X-ray diffraction and metallographic analysis. The hardness and adhesion of the layers produced have evolv eadc cording to the treatment temperatures, their values thus obtained are in agreement with the evolution of the physicochemical properties determined by the physical means used. (Graphical abstract present optical microscope observations of a chromium layer on substrate Z200Cr12.X500 treat at1100°C spawning 02 hours).

Citation

Abdelghani Belhocine , Mourad MAAZOUZ , Hani BENGUESMIA , Omar Allaoui, ,(2019-12-19), The influence of heat treatment of carbon steels after a deposit of chromium,the Fifth International Conference on Mechanics and Energy ICME' 2019 Decembre 19-21 Monaster Tunisia,TUNISI