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Author: search.filters.author.A. Zeghloul

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    Structural Reliability Improvement Using In-Service Inspection for Intergranular Stress Corrosion of Large Stainless Steel Piping
    (InTech, 2012) A. Guedri; Y. Djebbar; Moe. Khaleel; A. Zeghloul
    This paper describes probabilistic calculations that address Intergranular Stress Corrosion Cracking (IGSCC) of large stainless steel piping, a degradation mechanism of major concern to nuclear pressure boundary integrity. The first objective was to simulate the cracking of stainless steel piping under IGSCC conditions using the general methodology rec¬ommended in the modified computer program Piping Reliability Analysis Including Seismic Events (pc-PRAISE), and to characterize IGSCC by a single damage parameter (Dσ). This parameter, depends on residual stresses, environment conditions, and degree of sensitization. The second objective is to evaluate the structural reliability using remedial actions for IGSCC which are limited to benefits of in-service inspections and to identify the most effective approaches to improving piping reliability.
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    Reliability Analysis of Low Alloy Ferritic Piping Materials
    (Springer, Dordrecht, 2009) A. Guedri; B. Merzoug; Moe Khaleel; A. Zeghloul
    The aim of this study is to improving microstructure and mechanical properties of the weldable gas pipeline steel using laboratory mill. To achieve the required microstructure and mechanical properties of thermo mechanically processed HSLA steels, it is necessary to have an idea about the role of composition and process parameters. The large numbers of parameters obtained during the production process in the plant were systematically changed to optimize the strength and toughness properties. The optimized parameters were used for the production of the API X60/X70 steel. However, the controlled cooling after rolling should result in transformed products that provide excellent combination of strength and toughness. The coiling at an appropriate temperature have the advantage of the precipitation strengthening, giving further rise to the high yield strength and also improvement in toughness of the steel. The coiling temperature is a decisive parameter because it determines the beginning of the formation of fine precipitations. Therefore, four different laboratory cooling systems were used, in this study to simulate the rolling conditions of a real industrial Thermomechanically controlled process, as close as possible and to check the possibilities of improving the mechanical properties of the welded pipeline steel.