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

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

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

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

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 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

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