Austempering is two steps heat treatment process that, when applied to ductile iron, produces components that have properties superior to those processed by conventional treatment. Depending to chosen heat treatment parameters different final properties of the casting are obtained. In this paper heat treatment parameters for producti...

By Hasan Avdušinović, Almaida Gigović-Gekić

Cu-alloys have been intensively studied because of their high thermal conductivity, good electrical and shape memory properties and low cost. Cu-Al-Mn alloys show a higher ductility and elongation in relation to the other Cu-based alloys, as well as a good potential for a cold drawing. Therefore, the investigation of these alloys is ...

By Tamara Holjevac-Grgurić, Dragan Manasijević, Dragana Živković, Ljubiša Balanović, Stjepan Kožuh, Robert Pezer, Ivana Ivanić, Ivan Anžel, Borut Kosec, Ladislav Vrsalović, Mirko Gojić

Polymer bonded Nd-Fe-B magnets belong to the group of functional composite materials, which consist mainly of two components: a polymer binder (PPS, PA) and magnetic particles of Nd-Fe-B alloy. The appropriate amounts of polymer binder, magnetic powder and additives are compounded by the twin screw extruder into a compound, that can ...

By Mihael Brunčko, Peter Kirbiš, Ivan Anžel

The paper presents investigation of the influence of water to cement ratio, w/c, to speed the corrosion of concrete and reinforcing steel in concrete caused by salts of magnesium. The samples were preparatory varying w/c (0,5 and 0,7). The test samples were treated nine months in the following solutions: 5% MgCl2, 5% MgSO4, 5% MgCl2 ...

By Farzet Bikić, Dejana Brkić

The increase in energy prices in the world, then the realization of less dependence on energy imports, and in particular meeting the hierarchical concept of waste management as it is in the EU, including reducing emissions of greenhouse gases (GHG Greenhouse Gases) in accordance with the Framework Convention of the United Nations Convention on clim...

By Mahmut Jukić, Ifet Šišić

Because of the oil shortage and the growing increasing environmental burdens-emission from motor vehicles, the idea of the biofuels application has been actualized. The European Union directive 2003/30/EC obliged Member States that until 31 December 2005, they must provide at least 2% share of biofuels and other renewable fuels in the total amount ...

By Šefkija Botonjić, Ilhan Bušatlić, Azra Halilović, Adnan Muratović

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 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

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