The review of long-lasting investigations at Department of Metallurgical Engineering, Technical Faculty in Bor, University of Belgrade in the field of thermodynamics and phase diagrams of numerous gallium-based systems is presented in this paper. The results of investigation of some binary and ternary systems, obtained experimentally...

By DRAGANA ŽIVKOVIĆ

Modern hydraulic binder Portland cement (PC) was before, and it remains today one of the most popular and widely applicable building materials, that is, considering the amount of production, the first in the world among industrial products. Conserving natural resources and environmental protection have led the cement industry to beco...

By JELICA ZELIĆ

The results of the comparative prediction of thermodynamic properties for Ga-Zn-Sn system are presented in this paper. Two thermodynamic predicting models were used for the calculation – one symmetrical (Muggianu), one assymetrical (Toop) model and general solution model. The calculations were done for different sections in exa...

By LJUBIŠA BALANOVIĆ, DRAGANA ŽIVKOVIĆ, DRAGAN MANASIJEVIĆ, DIANA ĆUBELA, TAMARA HOLJEVAC GRGURIĆ, NADA ŠTRBAC, ALEKSANDRA MITOVSKI

Just connect thermodynamic and kinetic factors, mechanisms and flow of process parameters in heats ferrous possible to plan , outline and guide the process of selective oxidation of certain metal elements, if necessary, non-metallic elements , estimate changes of the heat with thermodynamic and kinetic point of view. The above proced...

By DERVIŠ PIHURA, JAKOB LAMUT, DERVIŠ MUJAGIĆ

Flotation tailings represent the sources of pollution due to degradation of the areas in the vicinity of industrial facilities, raising dust that pollutes the air and penetration of contaminated water into water courses. Flotation tailings Bor, which was the subject of research in this paper, contains copper and is, therefore, a pote...

By NADA ŠTRBAC, ALEKSANDRA MITOVSKI, MIROSLAV SOKIĆ, IVAN MIHAJLOVIĆ, DRAGANA ŽIVKOVIĆ, LJUBIŠA BALANOVIĆ

The study presents the results of researching and conquering the technology of gravity bottom pouring of cooper alloys in water cooled moulds. The new approach in this procedure is a specially projected gating system which enables the gating of liquid metal without any interruptions. Thanks to the skimmer inside the gating system, as...

By BOGIĆ VLAOVIĆ, ZAGORKA AĆIMOVIĆ, MARKO PAVLOVIĆ, LJUBIŠA ANDRIĆ

During the solidification of continuously cast ingots, thermally induced stresses generate casting errors as hot cracks, bending or residual stresses. Contraction mechanism and shrinkage due to solidification of the alloy which is in a pasty state induce occurrence of the above mentioned defects. Simulation of thermo - mechanical pro...

By ANA BEROŠ, IVICA BULJETA

In this paper the effects of the deformation strengthening mechanism on mechanical attributes are evaluated (toughness is not treated) during cold drawing of a corrosion￾resistant austenitic steel NITRONIC 60. Experimental evidence indicates that the technological factors of cold working by drawing significantly affect both the intensity ...

By FAIK UZUNOVIĆ, OMER BEGANOVIĆ, SEAD SPUŽIĆ

Final product of the cold forming process gain many advantages that are mostly produced by strengthening of the material in the process. Those advantages are primarily explained as improving mechanical characteristic of the work material. Forward cold flow forming is among those processes and it is mostly related to (forming) shaping...

By SABAHUDIN EKINOVIĆ, IBRAHIM PLANČIĆ, EDIN BEGOVIĆ, HIMZO ĐUKIĆ, BRANKA MUMINOVIĆ

Steels for screws, nuts and rivets are usually low carbon steels, carbon steels or quenched and tempered low alloy steels. From these are required precisely defined strength properties, hardness and toughness, which determine the so called class strength of screws. This paper describes the thermal treatment of hexagonal screws with s...

By JUSUF DURAKOVIĆ, MIRSADA ORUČ, SULEJMAN MUHAMEDAGIĆ, RAZA SUNULAHPAŠIĆ, ALMAIDA GIGOVIĆ-GEKIĆ

Application of the new materials in the automotive industry is a challenge that is placed in front of researchers of our times. The challenge is reflected in the modification of the chemical composition of steel and heat treatment in order to achieve improved mechanical properties. Steel 17-7PH is austenitic - martensitic steel with ...

By BELMA FAKIĆ, DIANA ĆUBELA, MIHYAR NOURELDIN MAHMOUD

Dimensional tolerances of semi-products for the automotive industry became extremely narrow, and allow no deviations in the production process. In present research work the distortion behaviour of C15E (1.1141) and 42CrMo4 (1.7225) steels during two common industrial heat treatments (quenching and controlled heating and cooling) was ...

By DAMIR ČESNIK, MATEJ RUSTJA, MILAN BIZJAK, BLAŽ KARPE

The paper presents comparison of microstructure and hardness of Cu-Al-Ni shape memory alloy before and after heat treatment (quenching at 900°C/60 min/water and tempering at 300°C/60 min/water). Microstructural analysis was obtained by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy dispersive spectrometr...

By MIRKO GOJIĆ, IVANA IVANIĆ, STJEPAN KOŽUH, MILENKO RIMAC, OMER BEGANOVIĆ, KEMAL BEGOVIĆ BEGOVIĆ, BORUT KOSEC

This paper studies the effect of annealing on the microstructure and hardness, microhardness and electrical conductivity changes of cold deformed (ε=40%) sintered pure copper and Cu-4at.% Au alloy. The samples of pure copper and Cu-4at.%Au alloy were obtained by sintering, followed by prefinal rolling, quenching and final rolling with 40% r...

By IVANA MARKOVIĆ, SVETLANA NESTOROVIĆ, DESIMIR MARKOVIĆ, DRAGANA ŽIVKOVIĆ

In this work we studied the response of newly developed armored steel plates PROTAC 500 to the ballistic testing with armored piercing bullets with a core of tungsten carbide, charge 7.62 mm. Interactions between the bullets and the steel plate was investigated by standard metallographic and mechanical testing methods. We were interested in the geo...

By JURE BERNETIČ, GORAZD KOSEC, SLAVKO AŽMAN, MATJAŽ MARČETIČ, BOŠTJAN PODLIPEC, BORUT KOSEC, ALEŠ NAGODE, LADISLAV KOSEC, MIRKO GOJIĆ, MILENKO RIMAC, OMER BEGANOVIĆ, ZIJAH BURZIĆ, FRANC VODOPIVEC, IZTOK TOMAŽIČ

Innovative idea of the device for detecting microstructure changes, concept and construction was carried out and controlled by authors of this article in cooperation with Slovenian industry. Since the electrical resistance is one of the most structurally sensitive properties of the materials, we used its measurement to detect microstructural change...

By MILAN BIZJAK, BLAŽ KARPE, BORUT KOSEC, ALEŠ NAGODE, GORAN BROVČ, MIRKO GOJIĆ

Partially crystalline metallic glass ZrCu was prepared in the form of ribbons by melt-spinning. The chemical composition and homogeneity of the samples alongside partial crystallinity with the existence of an amorphous matrix was confirmed. The measured value of microhardness shows a nonlinear dependence with the increase of Cu. By adding a small f...

By KERIM HRVAT, AMRA SALČINOVIĆ FETIĆ, LJERKA SLOKAR, MATEJ LOZANČIĆ, ANDRIJA FRANJKOVIĆ, SENAD HATIBOVIĆ, SUADA SULEJMANOVIĆ

This paper describes the behavior of welded steel components NN-70 in the presence of defects such as cracks in the operation of variable load. Knowing the conditions under which the particular construction operates and knowing the welding technology of the same, we can solidly calculate and assume the remaining life of exploration. By assessing th...

By DŽENANA GAČO, ZIJAH BURZIĆ, FADIL ISLAMOVIĆ, NERMIN BIŠĆEVIĆ

The material of journal end wall for cement mill is cast steel GS-20Mn5, WNo: 1.1120 according to standard DIN 17182. The journal end wall is made from two separately cast part - the plate and the cylinder, which are joined by welding. Inhomogeneity in the rough cast microstructure of materials, inadequate heat treatment of normalization, large non...

By EMINA KRATINA, BELMA FAKIĆ, ADISA BURIĆ

The paper presents numerical procedure for determining fracture mechanics parameters in elastic￾plastic conditions aroundthe crack tip. Applied to this instance, the analysis included the determination of contour J integral by the energy domain integral method. Both, numerical model of standard dimensions SENB specimen and network of finite element...

By BAHRUDIN HRNJICA, FADIL ISLAMOVIĆ, DŽENANA GAČO, ZIJAH BURZIĆ

Finite element simulations of a fixed-ratio mode-mixity test (single configuration) are performed using cohesive zone model. Different simulation parameters are varied: automatic stabilisation, cohesive element viscosity and mesh size. A global and local approach are presented and used for calculation of energy release rate contribution from mode I...

By JOSIP KAČMARČIK, ALEKSANDAR KARAČ

In this paper is presented influence way of preparing steel reinforcement on rate of corrosion steel reinforcement in cement mortar. Reinforcements were prepared mechanically and chemically. Testing of corrosion of reinforcing steel in cement mortar is executing on the measuring device which consists of an electrochemical cell and potentiostat/galv...

By FARZET BIKIĆ, MIRSADA RIZVANOVIC

The paper discusses the 3D printing technology and its impact on current industry practice. These are the advantages and the problems that must be solved to make this technology has become the new industry practices, as well as its impact on the development of materials for this technology with a special focus on metallic materials, respectively me...

By DIANA ĆUBELA, ALMAIDA GIGOVIĆ-GEKIĆ

The paper presents an application of the Additive Manufacturing (AM) technology using the Objet 3D Printer to develop femoral component of total knee endoprosthesis patterns for investment casting process. The goal of the paper is to outline the manufacturing technology intended for prototype production with the use of PolyJet technology and invest...

By ALEKSANDAR RAJIC, SLOBODAN STOJADINOVIC, DORIAN NEDELCU, LJUBICA LAZIC VULICEVIC

For the production of vertically perforated bricks with very good thermal insulation properties it is necessary to increase porosity of ceramic body. The most effective way to achieve this is the addition of organic substances into the clay mass. During the firing process combustion of these substances occures, leaving behind a large number of fine...

By ADNAN MUJKANOVIC, MARINA JOVANOVIĆ

A coal dust is added to brick clay mainly to save energy and increase porosity. This paper examines the influence of coal from Coal mine "Kakanj", in the amount of 10% and 20%, on some physical and technological properties of brick clay "Rapajlo". The impact of coal on the plasticity of clay, and the characteristics of dried and fired samples was i...

By MARINA JOVANOVIĆ, ADNAN MUJKANOVIC, MIRSADA RIZVANOVIC, MERIMA BRKIĆ

This study is about possibility of the production of CEM I 52,5 in cementplant Kakanj satisfying some requirements for cement quality issued by EN 197-1. By EN 197-1, CEM I 52,5R consists of 95-100 % clinker and minor additional constituents of 0 - 5 %. Fly ash and granulated blast furnace slag are used as minor constituents in this study. The lowe...

By ILHAN BUŠATLIĆ, NADIRA BUŠATLIĆ, NEVZET MERDIC, NEDZAD HARAČIĆ, AMILA MUSIC

The main characteristic of hydrotechnical cement, which is used to build massive structures, is the low heat of hydration. In this work is examined the effect of the electrofilter ash with a high content of calcium oxide addition on the hydration heat of Portland cement. The cement samples containing 0% to 50 % fly ash from TPP „Kakanj“...

By ILHAN BUŠATLIĆ, NEVZET MERDIC, NADIRA BUŠATLIĆ, ASIM IBRAHIMAGIĆ, AZRA SMAJIĆ

In order to determine the possibility of using recycled aggregate for concrete production, properties of recycled aggregate and limestone aggregates: particle size distribution, oven-dried particle density, saturated and surface dried particle density and apparent particle density, water absorption, resistance to fragmentation and impact resistance...

By ADNAN MUJKANOVIC, MARINA JOVANOVIĆ, ADELA TELALOVIĆ, ALMIR BAJRAKTAREVIĆ, ADIS ĆATIĆ

The impact of chemical corrosion on the durability of tundish working lining based on slurry mix is discussed in this work. The results of chemical and mineralogical analysis in the sample of tundish working layer after lining lifetime are presented. Infiltration of slag effected in a reduced thermal shock resistance resulting in thermal stress on ...

By AIDA MAHMUTOVIĆ, OMER KABLAR, ŠABAN ŽUNA

When considers about design/development of products then it must be objectify one of the following aspects, development of completely new products, development of new product lines, addition of existing product lines, improvements and revisions of existing products, repositioning and cost reduction. When you design a product, it is necessary to mak...

By ZEHRUDIN OSMANOVIĆ, NEDZAD HARAČIĆ

In this paper the synthesis of nanoparticles of iron oxide from aqueous solution was carried at temperatures of 10, 20, 30, 40, 50 and 60 °C and with a different precipitation rate controlled by addition of a precipitating agent. The possibility of synthesis of ferrofluid with different ratios of reactants (FeCl2 and FeCl3 solution and NH4OH) w...

By PERO DABIĆ, DAMIR BARBIR, BRUNO MORANDUZZO

This study has examined the process of sintering of Mg0 samples (80 % precipitation) obtained from seawater at a temperature of 1600 ºC with time until the sintering temperature is obtained, in order to examine their properties (density, porosity) and chemical composition after sintering. The prepared magnesium oxide samples are distinguished ...

By MIROSLAV LABOR, MARINA PERIĆ, JELENA JAKIĆ, VANJA MARTINAC

One of the basic supplements that regulates the relationship between the base and acid components during the technological process of sintering is limestone (CaCO3). By adding the same will be made on a new phase in the sinter compounds that may have positive or negative effects on the quality of the same. To be able to fully monitor the phase tran...

By AMEL ZAHIROVIĆ, SELVEDIN HRUSTIĆ, FARZET BIKIĆ, NEVEN UKRAINCZYK

The paper will present the experimental results of testing the mechanical properties of composite materials made of short and long glass fibers, or their combination. It will also present the results of pressure vessels’ hydro-testing, where the emphasis was put on the level of safety, i.e. the possibility of repair of pressure vessels made o...

By MIRZET BEGANOVIĆ, FADIL ISLAMOVIĆ, ATIF HODŽIĆ, ESAD BAJRAMOVIĆ

Today there is a growing research activity in order to investigate the possibility of using various waste or alternative materials in the cement and other industries. In this regard, granulated blast furnace slag is a significant addition to the metallurgical cement type CEM III. Cements based on blast furnace slag consist of a mixture of cement cl...

By NEDZAD HARAČIĆ, NEVZET MERDIC, ILHAN BUŠATLIĆ, ZEHRUDIN OSMANOVIĆ, JELICA ZELIĆ

The changes of optical properties under boundary presence in molecular crystal nanofilm were theoretically investigated in this work. The dispersion law and states of excitons as well as their space distribution along boundary direction have been determined using adjusted Green’s function method and also by combined analytical and numerical c...

By S.M. VUČENOVIĆ, B. ŠKIPINA, S.S. PELEMIŠ PELEMIŠ, D. RODIĆ, I.J. ŠETRAJČIĆ, S. ARMAKOVIĆ, J.P. ŠETRAJČIĆ

This paper presents results that prove the existence reactions of chlorides binding to aluminates, analyzing monochloroaluminate-hydrate product of these reactions. It is also proven to increase the temperature been moving the balance of this reactions to the right. The obtained results are significant, considering the aspect of preventing corrosio...

By FARZET BIKIĆ, MIRSADA RIZVANOVIC

One of the first tension resistant materials that is used to build structures is wood. It is highly anisotropic material. The strength of wood in the fiber direction is relevant for dimesioning. From the economic point of view necessity of strengthening the damaged wooden structures is questionable. Given that this is a light material, suitable for...

By AMIR ČAUŠEVIĆ, NERMAN RUSTEMPAŠIĆ, NADIRA KULJUH-BOLIĆ

For exceptional demands of product quality, modern technological solutions allow that the nutritive value of food products, produced using a different technological processes, preserve and extend with application of a modified atmosphere. Using a combination of modified amtosfere, depending on the barrier properties of packaging materials, allows c...

By AJKA ALJILJI, DRAGANA ŽIVKOVIĆ, NEBIJA ALJILJI

Manufacture of pulp for making paper and paperboard in the world has a rapid growth. The need for paper and cardboard is constantly increasing, but the limiting factor is the lack of raw materials - biomass. As a result, there has been a technological orientation to new types of raw materials, which, along with a modified chemical processing proced...

By SALIM IBRAHIMEFENDIĆ, AMRA TUZOVIĆ, MARIJA GARIĆ

Some laboratory enquire has been made on relating correlation main physical-mechanical characteristics of prepared leather where in producing process use mineral as well as herbal tans. It’s well known that use of herbal tans in producing leather has justification in aspect of environment protection issues and health protection. Experimental ...

By ŠEFKIJA BOTONJIĆ, MERIMA HASELJIĆ

The study examined adsorption of Reactive Violet 5 (RV-5) textile dye from the aqueous environment on MFI zeolites as adsorbents at 283, 293 and 303 K. The reaction was observed on the original NH4ZSM-5 zeolite, a product of the Zeolyst International American company, and on the modified HZSM-5 zeolite. The concentration of dye before and after the...

By S. SLADOJEVIĆ, D. BODROŽA, J. PENAVIN ŠKUNDRIĆ, Z. LEVI, LJ. VASILJEVIĆ, B. ŠKUNDRIĆ

In Europe and the world number of companies and institutions which in development strategies include social responsibility strategies is bigger every day. It is a response to market demands and pressures of economic and social community on the issue of environmental protection. Corporate social responsibility is the responsibility of the company as...

By NEIRA DELIĆ, MILENKO RIMAC, MIRSADA ORUČ

Today global steel producers give increased emphasis on protecting the environment and deploy into production and supporting the activities of the so-called concept of sustainable development, which is reflected particularly in the implementation of environmental management systems. In the work a short review of the World and Slovenian steel produc...

By BORUT KOSEC, IGOR BUDAK, GORAZD KOSEC, ERIKA VIDIC, ZORANA TANASIĆ, MIRKO SOKOVIĆ

In the process of production of iron and steel substantial amounts of fuel and raw materials are consumed. Metallurgical coke as fuel, reducing agent and material that provide gas flow trough blast furnace processes must possess certain properties in terms of strength, due to expected changes in the conditions of high temperature environment. Deman...

By SULEJMAN MUHAMEDAGIĆ, HASAN AVDUŠINOVIĆ

This paper describes the analysis and rationalization of energy consumption in gray iron foundry CIMOS TMD Casting Zenica. Based on results of analysis the key points are defined rationalized and measures proposed to reduce energy consumption, and therefore reduce production costs. The most significant share of energy consumption, and therefore in ...

By SEDAD MUŠINOVIĆ, HASAN AVDUŠINOVIĆ, ŠEHZUDIN DERVIŠEVIĆ

Steel shot is used in foundries as a means for mechanical cleaning of castings. Due to wear (mechanical damage) there is a change in size of shot. After some time of use steel shot it becomes unusable for shot blasting process and becomes waste. Studies have shown that this type of waste has good adsorption properties and it is suitable adsorbent f...

By ANITA ŠTRKALJ, ZORAN GLAVAŠ, KREŠIMIR MALDINI, DAMIR HRŠAK, IVICA ŠIPUŠ

Opencast mines are a part of the systems with the worst influence on all environmental components (air, water, ground, flora and fauna). In the case that we completely left out safeguards, dust emission would have a significant impact on the health of employees and the local population. Dust emission from quarries belongs to fugitive emissions and ...

By ŠEFKET GOLETIĆ, AMINA AHMIĆ

Standard ISO-834 five curve does not represent any real fire situation, but exists in fully controlled laboratory standardized test conditions only. Parametric five curves take in consideration size and geometry of the fire compartment, probability of fire appearance, fire spread and duration, density and arrangement of fire load, importance of the...

By SANIN DŽIDIĆ

The goal of this paper is to present the experience in fire resistance testing of the self-supporting facade sandwich panels with sheet metal lining and PIR insulation, thickness 80 and 100 mm, that have been tested to the Standard Fire Curve ISO-834 as well as external fire curve, to the scientific and professional community in the field of expert...

By EDIN GARAPLIJA, SANIN DŽIDIĆ, VEDRAN AVDIĆ

The expansion of the transport sector has produced a number of negative factors that constantly threaten the quality of life and economy of the country. Studies have shown that motor vehicles can pollute the environment and economy of country with more than 50% compared to other pollutants. Also, automobile traffic reduces the quality of the enviro...

By DRAGANA AGIĆ, FUAD KLISURA, MUHAMED BARUT

The problem of deteriorated air quality in the area of Zenica is primarily due to the emission of harmful substances from industrial and thermal power plants, local boilers, and then from road traffic, which has initiated various studies to analyze and evaluation of emissions and their impact on air quality, and finding solutions for improve and pr...

By JUSUF BORIĆ, ŠEFKET GOLETIĆ