Nemak Europe

Linz, Austria

Nemak Europe

Linz, Austria
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Djurdjevic M.B.,Nemak Europe | Manasijevic S.,Lola Institute | Odanovic Z.,IMS Institute | Radisa R.,Lola Institute
International Journal of Materials Research | Year: 2013

A comprehensive understanding of the solidification process is of paramount importance for the control and prediction of actual casting characteristics. The present work presents the potential of cooling curve analysis to characterize the solidification path of a cast hypoeutectic series of Al-Si-Cu alloys. The aim of this work was to examine how variation in chemical composition of Si (from 5-9 wt.%) and Cu (from 1-4 wt.%) may affect characteristic solidification temperatures, their corresponding solid fraction, and thermal freezing ranges of the investigated alloys. All solidification parameters that have been calculated using cooling curve analysis show good correlation with the corresponding parameters calculated using commercial Pandat software. These parameters, either collected from the cooling curve analysis or calculated using Pandat software, can be easily incorporated into existing simulation software packages in order to improve their accuracy. In addition, cooling curve analysis can be used to estimate the effect of cooling rate on the above mentioned solidification parameters and used as additional input data for simulation. © Carl Hanser Verlag GmbH & Co. KG.


Manasijevic S.,LOLA Institute | Dolic N.,University of Zagreb | Zovko Brodarac Z.,University of Zagreb | Djurdjevic M.,Nemak Europe | Radisa R.,LOLA Institute
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2014

This paper presents the results of an analysis of the formation of an intermetallic bond between a ring carrier and an aluminum piston alloy. The ring carrier is made of austenitic cast iron (Ni-Resist) to increase the wear resistance of the first ring groove and is applied in highly loaded diesel engines. The most important thing is that the Ni-Resist (ferrous) must be bonded with a non-ferrous piston material during the casting of the piston. A metallographic investigation using an optical microscope in combination with the SEM/EDS analysis of the quality of the intermetallic bonding layer was done. The test results show that if the proper conditions are met, then the preparation of the ring carrier can be made successfully, as can the formation of the metal connection between the two materials of different qualities. © 2014 The Minerals, Metals & Materials Society and ASM International.


Manasijevic S.,LOLA Institute | Dolic N.,University of Zagreb | Djurdjevic M.,Nemak Europe | Zovko Brodarac Z.,University of Zagreb | Radisa R.,LOLA Institute
Kovove Materialy | Year: 2015

This paper presents the results of testing the microstructure in the most critical zones of pistons made of aluminum piston alloys. The paper analyzes the shape, size and distribution of primary Si crystals and other phases in three most important piston zones (the edge of the combustion chamber, the area of rings groove and piston pin boss). The phase stoichiometry was identified by comparing the results of EDS analysis with the results reported in the studied literature. The results show that the necessary size, shape and distribution may be obtained in specific zones if appropriate solidification conditions are provided that are necessary for the formation of specific phases.


Manasijevic S.,Lola Institute | Dolic N.,University of Zagreb | Djurdjevic M.,Nemak Europe | Misic N.,Lola Institute | Davitkov N.,University of Belgrade
Revista de Metalurgia | Year: 2015

This paper presents the results of investigating the formation of intermetallic bond between a ring carrier and aluminum piston alloy. The ring carrier is made of austenitic cast iron (Ni-Resist) in order to increase the wear resistance of the first ring groove and applied in highly loaded diesel engines. Metallographic examination of the quality of alfin bond was done. A metallographic investigation using an optical microscope in combination with the SEM/EDS analysis of the quality of the intermetallic bonding layer was done. The test results show that can be made successfully as well as the formation of metal connection (alfin bond) between the ring carrier and aluminum piston alloy.


Djurdjevic M.B.,Nemak Europe | Odanovic Z.,IMS Institute | Talijan N.,University of Belgrade
JOM | Year: 2011

Available databases presently used by commercial simulation software packages for the aluminum casting industry usually come with material properties for only a few selected standard alloys. In the case of other alloys with different chemical compositions and refinement or modification treatment, thermal analysis could be an invaluable tool in order to gain necessary properties. The aim of this paper is to characterize the solidification paths of Al-Si5-Cu(1-4) alloys and quantify the amount of solid fraction using cooling curve analysis. The correlation between solid fraction and temperature has been determined using Newtonian and Fourier techniques of base line. Both techniques are also briefly described in this paper. The obtained results have been compared with results obtained using available commercial software (e.g., Pandat and JMatPro). © 2011 TMS.


Djurdjevic M.B.,Nemak Europe | Huber G.,Nemak Linz GmbH | Odanovic Z.,Serbian Institute for Testing of Materials IMS
Journal of Thermal Analysis and Calorimetry | Year: 2013

Available databases presently used by commercial simulation software packages for the aluminum casting industry are usually armed with material properties for only a few selected standard alloys. In the case of other alloys with different chemical compositions and refinement or modification treatment, thermal analysis could be an invaluable tool to gain necessary properties. The aim of this article is to demonstrate the potential application of the cooling curve analysis in the existing simulation software by improving its accuracy. © 2012 Akadémiai Kiadó, Budapest, Hungary.

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