Faculty of Mechanical Engineering

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Author: search.filters.author.Poser B. Maja

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    Weldability between steel type 304H and steel type P91 for high temperature applications
    (Serbian Welding Society, 2023)
    Krstevska, Aleksandra
    ;
    Poser B. Maja
    ;
    This paper presents research about weldability between two dissimilar steels, martensitic steel P91 and 304H austenitic steel. Both materials are being preferred as a structural material for higher temperature applications due to their good mechanical properties at high temperatures. The mechanical properties at high temperature, such as tensile strength and creep resistance, are very important factors that ensure the application of materials. The P91 is modified martensitic Cr steel with higher amount of chromium which improves the higher temperature strength and molybdenum that increases creep resistance. On the other hand, the 304H represents advance austenitic stainless steel with controlled carbon content, which makes it ideal for applications requiring good mechanical properties at elevated temperatures. With increasing the demand of high efficiency in the power generation industry the high temperature applications usually require joints between advanced austenitic stainless steels and new class martensitic stainless steels in order to achieve the goal with the increased steam parameters. Therefore, this paper focuses on the weldability assessment between these two different steels and the characteristics of the weld metal.
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    Hardfacing alloys for excavator teeth coating
    (Serbian Welding Society, 2024)
    Poser B. Maja
    ;
    ;
    Petrevski, Martin
    ;
    Pavlovic, Milos
    ;
    Jeremic, Vladan
    The capacity of the rotоr excavator depends to a significant extent on the backet teeth. Abrasive wear of cutting teeth and cutting edges is typical when digging sand, sandy clay and gravel in common rock environments. Of particular importance is the contribution of the correct geometry of the teeth, their position on the backet, and especially their sharpness, which they lose over time. Over time, teeth become blunt due to abrasive wear and their geometry changes. The digging resistance becomes greater, and therefore the efficiency of the rotor excavator decreases. White cast iron stands out as a base alloy that has wear resistance, but has very low toughness and often brittle fracture under impact loads. Manganese steel, although it has the property of deformation strengthening, has no wear resistance when digging in sand. This condition can be improved by choosing a material more resistant to abrasive action. Excavator teeth that fail due to abrasive wear can be protected from abrasive wear by the use of hardface coating. These hardfacing alloys are presented in this paper.