Faculty of Mechanical Engineering

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Author: search.filters.author.Filip ZdraveskiHas files: Yes

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    Item type:Publication,
    A REVIEW STUDY ON HYDROGEN EMBRITTLEMENT OF STEEL
    (Society for structural integrity and life “Prof. Dr Stojan Sedmak” Institute for materials testing (IMS), Belgrade, 2024-11-23)
    Elena Anastasovska
    ;
    Elisaveta Doncheva
    ;
    Filip Zdraveski
    A common and intricate phenomenon known as hydrogen embrittlement of steel is the deterioration of the mechanical properties of metal in relation to stress corrosion cracking. This phenomenon has been extensively studied, with numer ous works proposed over the last two decades, but there is still a lack of unified solutions and a solid understanding of the phenomenon. The purpose of this paper is to provide a review of the literature and publications on hydrogen embrittlement in steel. It focuses on recent developments and methods that have contributed to a better understand ing of the relationship between steel structure, properties, and performance, with a particular emphasis on hydrogen diffusion, characterisation, mechanisms, and prevention of hydrogen embrittlement in structural steel. Furthermore, the paper discusses recent advances in experimental and multi-scale modelling and proposes future studies to address challenges related to hydrogen embrittlement in steels.
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    Wire-arc additive manufacturing: recent developments and potential
    (The Academy of Applied Technical Studies Belgrade, 2023-12)
    Elisaveta Doncheva
    ;
    Aleksandra Krstevska
    ;
    Marjan Djidrov
    ;
    Filip Zdraveski
    ;
    Trajche Velkovski
    Wire-arc additive manufacturing (WAAM) is a promising technology for producing medium and large components without traditional subtracting technologies. It is a hybrid of two manufacturing techniques: additive manufacturing and welding. The use of this technology has grown significantly due to advantages such as material and energy savings while achieving high deposition rates and low cost. However, there are some issues with microstructure homogeneity, and properties are affected due to the complexity of the arc-induced thermal cycles and metallurgical mechanisms, resulting in high residual stresses, distortion, porosity, cracks, and delamination. This article summarises the progress made in the field of wire additive manufacturing, with a focus on welding systems, tool path design software, material analysis, and control systems. It also highlights some critical aspects that must be addressed to ensure high-quality production, such as control and diagnosis mechanisms for defect monitoring, the effects of parameters and their optimisation possibilities for improving quality, ensuring process stability, and possible post-deposition heat treatments. The conclusions suggest further improvements to the wire-additive manufacturing process in terms of accuracy, reliability, and efficacy, as well as future applications of the technology and research activities.