Research » Alloying Metallurgy
Alloying metallurgy is confronted with increasing complexity, as requirements of metallic high-tech materials rise with regard to composition, cleanliness and homogenity. In order to comply with strict tolerances, metallurgical vacuum processes are applied, which allow, for instance, melting of metals with high oxygen affinity, removal of dissolved gases or non-metallic inclusions as well as selective distillation of volatile metals. The available equipment at IME for these purposes comprises various vacuum induction furnaces, a pressure-slag-remelting unit and a vacuum arc furnace. Currently research on the following projects is conducted:
– Alternative production methods of Cu-Cr-alloys
– Influence of a rotating electrode on the ESR-process
– Processing of lead-containing copper alloys in consideration of current EU regulations
Alumni:
- Dr.-Ing. Simon Hilgendorf
- M.Sc. Martin Schwenk
- M.Sc. Alexandra Daldrup
- M.Sc. Frederic Brinkmann
- Dr.-Ing. Sebastian Radwitz
- Dr.-Ing. Johannes Morscheiser
- Dr.-Ing. Karsten Neumann
- Dr.-Ing. Janik Brenk
- Dr.-Ing. Jiang Zeng
Project List
Title
Influencing the refining effect and the solidification behavior in the electroslag remelting process by a rotating metal / slag system
Type
No information
Sponsorship
DFG
Duration
–
Partner
–
Description
In electroslag remelting (ESR), the material cast into electrodes is successively melted in a slag bath, refined by various chemical and physical mechanisms and solidified in a water-cooled copper mould. In addition to a significantly improved degree of purity, controlled solidification can also be achieved. Compared to ingot casting, the low melt volume and the induced stirring result in a reduction of macrosegregation and, due to the low local solidification rates, a reduction of microsegregation. At the contact surface between the slag and the mould, a slag skin about 1-3 mm thick is formed, which on the one hand reduces the direct heat loss to the mould, but on the other hand also reduces the cooling speed of the metal.
Title
Influence of the interfacial reactions in the transition zone of zinc coating steel substrate by varying the chemical composition of the substrate areas near the surface and the immersion bath composition
Type
No information
Sponsorship
DFG
Duration
–
Partner
IEHK, GfE
Description
Ziel des Vorhabens ist es, neue Wege zu beschreiten, um die Schmelztauchveredlung von höherlegierten Stählen zu ermöglichen. Über eine Modifikation der Vorbehandlung in Kombination mit veränderten Legierungszusammensetzungen im Zinkbad soll dieses Ziel erreicht werden. Durch die Vielzahl der chemischen Veränderungen ist es unumgänglich, die ablaufenden Reaktionen und den Aufbau des Schichtverbundes mit Hilfe elektronen¬mikroskopischer Untersuchungen zu kennzeichnen.
Title
Corrosion protection and property profile of electrochemically deposited ZnSnX alloy layers with the addition of passive-film-forming elements X
Type
No information
Sponsorship
Max-Buchner-Forschungsstiftung
Duration
–
Partner
–
Description
The aim of this research work is to further develop the electrochemically deposited SnZn system by adding a passive layer-forming element. This ternary alloy system should have better corrosion resistance due to an improved, insoluble oxide barrier layer, without worsening the property profile of the already introduced Sn-Zn layer. This barrier layer is to be protected by an element of the 4th period.
Title
Reduction of zinc losses by integrating continuous processing of contaminated zinc melts in the production process of hot-dip galvanizing companies
Type
No information
Sponsorship
BMBF
Duration
01.07.2004 – 30.06.2007
Partner
Verzinkerei März Pulverbeschichtung GmbH & Co. KG, Dur.Metall GmbH & Co. KG, W. Pilling Riepe GmbH & Co. KG-Deutschland
Description
The aim of the project is the development of a new process for the separation of hard zinc and zinc ash from the zinc bath by means of centrifugal technology in a continuous galvanizing process. A pilot plant will be docked to a production furnace and the technical feasibility will be tested in a medium-sized galvanizing company. Based on this, a recycling concept for the modified composition of the galvanizing residue is developed.
Title
Alloy design of Al- and Al-Li materials for thixoforming
Type
No information
Sponsorship
DFG
Duration
01.01.2002 – 31.12.2004
Partner
IEHK, IBF, GI RWTH Aachen-Deutschland
Description
The thixoforming of metals is still a young production process, located between the primary forming and forming. Today, various components are already manufactured in series according to this manufacturing principle, mainly by thixocasting and thioxomoulding, almost exclusively using aluminium and magnesium. The processing of steels and other process routes are still under development. Even after these selective advances and despite a number of international research activities, it must be stated that this area of production has not been sufficiently researched either in its fundamentals or in its application by the various process variants and for many metals. There are numerous reasons for further scientific implementation of thixoforming. On the one hand, it is the great potential opened up by the semi-liquid state in terms of shaping and properties.
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