Steel S690 QL is a high-strength quenched and tempered, fine-grained structural steel with a minimum yield strength of ReH of 690 MPa and with guaranteed toughness (Charpy) for rolled plates with a thickness of 3 to 50 mm. This paper presents the examination and analysis of the microstructure and grain size results after quenching an...

By Mirsada Oruč, Aida Imamović, Almaida Gigovic-Gekic, Milenko Rimac

Austempered ductile iron is the last addition to the group of ductile irons obtained by isothermalimprovement of classic ductile iron. Austempered nodular cast iron has improved mechanicalproperties and a different matrix microstructure compared to known iron-based castings. Thistype of casting is obtained by isothermal improvement - austempering, ...

By Adisa Burić, Belma Fakić, Edib Horoz, Hasan Avdušinović, Raza Sunulahpašić

Steel cooling is an important technological operation because the final microstructure of the steel,and therefore its properties, depends on the cooling rate. The speed of steel cooling depends onnumerous factors, one of which is the movement of the cooling media. This paper presents theresults of testing the influence of mixing the cooling media o...

By Almaida Gigovic-Gekic, Hasan Avdušinović, Amna Hodzić, Branka Muminović

Long-term exposure of superheater and steam intermediate superheater pipe materials to high temperatures in the operating conditions that prevail in thermal power plants leads to the appearance of the oxide layer.Oxide layer forms on the inner wall of the pipe, which acts as a heat insulator and reduces heat transfer through the pipe...

By Belma Fakić, Adisa Burić, Edib Horoz

The paper describes the determination of the mechanical properties of the spherical floors of pressure vessels, obtained by the welding process and shaped by the process of gradual local deformation in the cold state, i.e. by the process of Incremental sheet forming (ISF). Spherical cylindrical bottoms are an integral part of most cl...

By Mustafa Hadžalić, Raza Sunulahpašić, Zlatan Ištvanić

In order to examine the state of critical components of the boiler of Unit 5 of Kakanj Thermal Prema wer Plant, headers were tested in order to undertake appropriate technological measures and activities on the basis of insight into the current state of affairs, and to make recommendations for further exploitation. From first commiss...

By Armin Husika, Belma Fakić, MIlenko Rimac

The particle shape and size of the starting powders represent the most important physicalproperties, on which the quality of the compacts and final sintered products depends. Two types ofpowder were analyzed in the paper - electrolytic copper powder with a dendritic particle shape andwater-atomized copper powder with an irregular particle shape. Th...

By Ivana Marković, Dragan Manasijević, Ljubiša Balanović, Uroš Stamenković, Milijana Mitrović, Stevan Trujić

This article deals with the analysis of the adsorptive properties of the waste produced during theshot blasting of castings in foundries. During this process, particles of moulding mixture andscale that remained on the surface of the casting after removal from the mould are removed. Sincethis waste contains particles of moulding mixture (SiO2, carb...

By Anita Štrkalj, Zoran Glavaš

The production of titanium is very expensive, so it is interesting to research technologiesthat require lower costs, such as the HDH hydrogenation-dehydrogenation processtechnology, which is used for cheaper powder production from the waste material oftitanium alloys.This paper presents the hydrogenation procedure of a recycled piece of the Ti6Al7N...

By Aida Imamović, Mirsada Oruč, Šaban Žuna, Esad Hadžibulić

Low-melting alloys, based on bismuth, indium, and tin, have found commercial use in soldering,safety devices, coatings, and bonding applications, due to their low melting point temperature ofeutectic compositions and small differences between their liquidus and solidus temperatures.Based on this, the accurate knowledge of their thermal properties s...

By Ljubiša Balanović, Dragan Manasijević, Ivana Marković, Milan Gorgijevski, Uroš Stamenković, Dajana Milkić