ABDELGHANI Belhocine

Benshil souheil

Conception et réalisation d'un outil de moletage

Taibi Abdelhak , Moussai Choaib

Diagnostic d'un moteur HDI subi un mode dégradé à haut régime

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/)