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

More recently modified stainless steels have been used to produce various structural elements that work in complex operating conditions. Stainless steel X8CrNiS18-9 (standard EN 10088-3: 2005) is the most commonly used austenitic stainless steel due to its good machinability. This steel has high mechanical and working properties than...

By Derviš Mujagić, Aida Imamović, Mustafa Hadžalić

The strength development of concrete containing ground granulated blast-furnace slag (GGBS), aby-product of iron in blast-furnace, as a partial substitute for cement,was experimentally studied.Levels of replacement of cement by slag were 12.5 %, 25 %, 37.5 %, and 50 % by weight ofcement. Slag taken immediately after it was discharged from the blast...

By Adnan Mujkanovic, Marina Jovanović, Nadira Bušatlić, Amel Zahirović, Anesa Bitić, Nevzet Merdić

We have introduced a theory for the calculation of thermodynamic characteristics for somecharacteristic nanostructures (ultrathin films and superlattices), using the adapted method of twotimetemperature Green's functions. In this paper, we have determined the coefficient of thermalconductivity using the definition of free energy and then compared t...

By Siniša M. Vučenović, Jovan P. šetrajčić

The translational symmetry of the distribution of atoms (ions) of the charge carriers (electrons orholes) system is broken by sputtering (doping),and due to the existence of two boundary surfaces.This is a model of high-temperature superconductors in which the observed symmetry breakingorthogonal to the CuO plane is treated as a perturbation. Singl...

By Jovan P. šetrajčić, Siniša M. Vučenović

The paper describes the research methodology of the heat generated by the biologicaldecomposition of a mixture of sludge from WTP (wastewater treatment plant) and biowaste and itsuse outside the system for a controlled biodegradation process. Earlier research in this area definedthe optimal mixtures of sludge and biowaste that ensure quality manage...

By Muvedet Šišić, Vehid Birdahić, Sanela Beganović, Mirnes Duraković, Farzet Bikić

Wood is renewable, recyclable, climate-friendly material, and presents an important segment inachieving circular economy and sustainability concepts. To be able to link these two concepts,production and consumption systems need to transform towards sustainability. Wood-basedproducts play a role in mitigating climate change by reducing carbon from t...

By Petar Ćurić, Jelena Obranković, Andreja Pirc-Barčić

The basic characteristics of the chemical composition of steel with improved machinability (X8CrNiS18-9) are the increased content of sulphur (0.15-0.45%), phosphorus (0.07-0.11%) and manganese (0.5-1.5%). Sulphur by creating sulphide inclusions reduces friction and cutting resistance, and increases the brittleness of the chip.Considering its harmf...

By Derviš Mujagić, Aida Imamović, Mustafa Hadžalić

 In modern times, the science of materials cannot be imagined without metallography. The history of metallographic testing in Bosnia and Herzegovina is primarily related to Zenica. Today, most of the research related to the metal industry in BiH is conducted in laboratories at the Kemal Kapetanović Institute in Zenica. The Institute's Metallog...

By Belma Fakić, Adisa Burić, Edib Horoz

Thermal properties and microstructure of the Sn-10% Ag and Sn-20% Ag alloys were experimentally investigated in this study. Melting behavior of the alloys were studied using differential scanning calorimetry (DSC). Microstructure of the alloys was analyzed by optical microscopy. The xenon-flash method was used for the measurements of thermal diffus...

By Dragan Manasijević, Ljubiša Balanović, Ivana Marković, Duško Minić, Aleksadar Đorđević