Mechanical properties of the ductile iron strongly depend on its microstructure. Different microstructural constituents result in different values of mechanical and ductile properties of ductile iron castings. One of the possibilities to design (define) microstructure of ductile iron castings is an application of different heat treatment processes....

By Hasan Avdušinović, Salaheldin Abdelmagid Mohamed Badreldin, Mohammed Abdelgadir Abdalla Mohammed, Faik Uzunović

This paper is concerned with carburization heat treatment. Standard carburization generally entails several steps: carburization of the surface layer by carbon diffusion at high temperatures, subsequent hardening and stress relief. This combination of hard surface and resistance to breakage upon impact is useful in parts such as a cam or ring gear,...

By Belma Fakić, Mohamed Fadlalla Mohamed Ahmed, Babekir Ahmed Osman Mohammed, Faik Uzunović

In this paper the effect of different heat treatment (recrystallization, spheroidizing and normalizing) processes on microstructure of the steel DC04 intended for deep drawing is presented. The steel is cladded with CuZn10 layers by explosive welding. Since the melting temperature of alloy CuZn10 is significantly lower (melting range 1025-1045 oC) ...

By Omer Beganović, Belma Fakić, Ali Mohammed Ali Mohammedzain, Babekir Ahmed Osman Mohammed, Faik Uzunović

Gypsum is added to the Portland cement clinker in the amount of 3 to 5% in the grinding phase as the binding rate regulator. When it comes to the hydration of cement, if sufficient amount of gypsum is added, fast cementation will not occur because gypsum by its presence reduces the solubility of tricalcium aluminate and thus slows down rapid reacti...

By Ilhan Bušatlić, Amna Karić

Successful examples of high–rise buildings in the world are obvious evidences that the use of high–strength concrete is nowadays reality in construction worldwide. Whether focus on high–rise buildings up to 15– 24 storeys, or the super tall high–rise buildings that are few hundred of storeys high, high–strength c...

By Ilda Kovačević, Sanin Džidić

Metallurgical coke, as a fuel and a reducing agent, also allows for the gas to go through a charge in the blast furnace. The coke must have a strength, porosity, reactivity and a uniform granulation, because reaction of CO2 at high temperatures in the furnace. There are various mathematical models for the optimization of coal blend, which allow the...

By Sulejman Muhamedagić, Mirsada Oruč, Admir Muminović, Amina Kurtović

Samples based on talc with 15 % of zeolite from Zlatokop, Serbia, sintered at 1200 ºC were prepared and tested in condition of cavitation erosion. The ultrasonic vibratory cavitation set up with stationary specimen was used. Mass loss was measured and degradation level of the samples using image analysis and Young modulus of elasticity was mon...

By Jelena Majstorović, Sanja Martinović, Milica Vlahović, Marina Dojčinović, Marko Pavlović, Tatjana Volkov Husović

Ratio of ultimate tensile strength and yield stress shows lower values in cold drawn wire than in hot rolled state. The results of research addressing the effect of variations in chemical composition of continuous casted billets on mechanical properties of cold-formed wire used in production of steel mesh are presented. In the c...

By Šaban Žuna, Aida Mahmutovic, Faik Uzunović, Sead Spužić

The austenitization is first operation at most operations of heat treatment, and it is implied heating steel on the austenitizing temperature and holding at this temperature while are not achieved completely transformation origin microstructure in austenite. Two base parameters which implicate at effect of austenitization are austeni...

By Armina Bašić, Almaida Gigović-Gekić, Hasan Avdušinović, Mustafa Hadžalić

In the city of Zenica steel is continuously produced more than 120 years. In all technological stages of production and processing of steel within integrated steel works large amounts of raw materials and fuels which contain a certain amount of sulfur are consumed. The flue gases formed during production and processing of steel contain certain conc...

By Sulejman Muhamedagić, Mirsada Oruč, Halim Prcanović