Livarski vestnik 55 / 2008 Nr. 3
Jožef Medved, Stanislav Kores, Primož Mrvar, Maja Vončina:
IRON IN ALUMINIUM ALLOYS
Franc Zupanič, Gorazd Lojen, Mihael Brunčko, Niko Rozman, Ivan Anžel:
CONTINUOUS CASTING OF NICKEL AND COBALT ALLOYS
Bührig-Polaczek, T. Röth, N. Novack:
HYBRID LIGHTWEIGHT COMPONENTS OF STEEL-SHEET ALUMINIUM COMPOUND CASTING
J. Medved, S. Kores, P. Mrvar, M. Vončina
Univerza v Ljubljani, Naravoslovnotehniška fakulteta
IRON IN ALUMINIUM ALLOYS
Abstract
Iron presents in Al-alloys the main impurity. At some alloys the irom presents the main alloying element, which increases the hardness of the alloys, but also increses brittlness. In this work the dissolution of the iron in electrolytic aluminium and AlSi12Cu(Fe) alloy was investigated. The dissolving of iron was researched with when the iron wire was putted into the melt of elecrolytic aluminium and AlSi12Cu(Fe) alloy at temperature 750 °C and dissolving times 0, 15 and 30 minutes. these specimens were investigated with scanning electron microscope (SEM), where the concentration of the iron in the aluminium and some iron phases were determined. With the simultaneous thermal analysis (STA) the characteristic temperatures and the solidification, melting and precipitation heats were determined. With the Thermo-Calc simulation program the equilibrium phases were calculated, where we determined which iron phase was precipitated durring solidification.
Key words: Al-alloys, iron phases, thermal analysis, ...
Key words: Al-alloys, iron phases, thermal analysis, ...
F. Zupanič, G. Lojen, M. Brunčko, N. Rozman, I. Anžel
Univerza v Mariboru, Fakulteta za strojništvo
CONTINUOUS CASTING OF NICKEL AND COBALT ALLOYS
Abstract
Only small part of vacuum-melted nickel and cobalt alloys are continuously cast. There are several reasons; the most important are relatively small world production of these alloys, their high melting points and unknown behaviour during continuous casting. Conventionally cast alloys in the form of ingots and bars can ever harder attain requirements properties because the customer demands are growing higher. Therefore it is not unusual that many producers of nickel and cobalt alloys want to test the ability of their alloys for continuous casting, and they even try to introduce continuous casting into their production. In this contribution the development of continuous casting of nickel and cobalt alloys on pilot continuous caster will be presented. In addition, also problems occurring during transfer of result of experimental casting to industrial practice will be addressed.
Key words: continuous casting, conventional casting, nickel alloy, cobalt alloy, vacuum melting, vacuum casting
Key words: continuous casting, conventional casting, nickel alloy, cobalt alloy, vacuum melting, vacuum casting
A. Buhring-Polaczek 1, T. Roth 2, N. Novack 2
1) RWTH, Aachen University
2) Imperia GmbH
HYBRID LIGHTWEIGHT COMPONENTS OF STEEL-SHEET ALUMINIUM COMPOUND CASTING
Introduction
Introduction
In the automotive industry new series car bodies have to feature special lightweight design qualities. Weight-saving potentials can be realized with improved steel and aluminium materials; but advanced materials and component properties can also be achieved by hybrid concepts. In the framework of a public funded project (AIF, Germany) Imperia GmbH, Tower Automotive Holding GmbH, Foundry Institute of RWTH Aachen University and Aachen University of Applied Science have developed and investigated a new hybrid concept by using the high pressure die casting process for the production of steel-sheet aluminium compound castings (ST-LM-Hybrid), figure 1. In this new technology steel sheets will be cast in with aluminium alloys to a closely connected compound. It can be shown that the lightweight potential of ST-LM-Hybrids - with corresponding design and materials selection - is higher than the performance of thin-walled and closed sheet structures of modern high strength steels and of premium aluminium die cast parts. In addition all the advantages of the integration potential of the casting process can be utilized. In a feasibility study different open questions were investigated: form closure and/or metallurgical closure between steel sheet and aluminium alloy; influence of steel sheet surface treatment and coating; adaptation of component and tool design; residual stresses and deformation; corrosion; failure mechanism of the compound under various load conditions.