Institute For Umformtechnik

Stuttgart, Germany

Institute For Umformtechnik

Stuttgart, Germany
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Hofmann D.,Institute For Umformtechnik | Rahammer M.,Institute For Umformtechnik | Liewald M.,Institute For Umformtechnik | Heckel T.,BAM Federal Institute of Materials Research and Testing | Huppmann M.,Neckarsulm
Materialpruefung/Materials Testing | Year: 2016

Steel/polymer/steel composites show several advantages in comparison to monolithic materials when strength, stiffness and damping characteristics are set to a global optimum. Although their mechanical properties were improved over the last years, the application of such hybrid materials in the automotive industry is not wellestablished due to insufficient knowledge about forming characteristics. However, it is difficult to detect the delamination during the forming process between the interlayer and the cover sheet. Delamination is the failure of the polymer interlayer and the metal sheet while both of the layers stay in contact. After failure, they are still bonded and stick together because of the weak van der Waals forces (kissing bonds), which makes it difficult to detect those defects. In this paper, various nondestructive testing methods are used to investigate the applicability and practicability in the detection of delamination on thin structural, polymer-based sheet metal composites. © Carl Hanser Verlag GmbH &Co. KG.


Wendl F.,Institute fur Umformtechnik der MittelstandischenWirtschaft GmbH | Oppenkowski A.,Ruhr University Bochum | Groll E.,Institute For Umformtechnik | Troost G.,Institute For Umformtechnik | And 2 more authors.
HTM - Haerterei-Technische Mitteilungen | Year: 2011

In order to improve the service lifetime of tools, the process of deep cryogenic treatment (DCT) has become more and more interesting in the last few decades. DCT is used as an additive process to conventional heat treatment and usually involves cooling the material to temperatures of -150 to -196 °C. In several publications this kind of treatment has been reported to improve the wear resistance of tools. Several attempts have been made in order to explain this cryo-effect. However, the metallurgical background of DCT and the effect on the microstructure are still not fully understood. In this study the influence of DCT especially on the tribological properties of cold work steel 1.2379 (AISI D2) was investigated. In addition to laboratory test, the lifetime of tools under real condition was determined. © 2012 Carl Hanser Verlag, M+nchen.


Seyboldt C.,Institute For Umformtechnik | Liewald M.,Institute For Umformtechnik | Riedmuller K.R.,Institute For Umformtechnik
Materials Today: Proceedings | Year: 2015

Current research activities at the Institute for Metal Forming Technology (IFU) of the University of Stuttgart are focusing on processing high-melting metal materials in the semi-solid state. This forming process is performed in the range between solidus and liquidus line and uses therefore the low materials viscosity in its semi-solid state for realizing complex part geometries. The research work deals with alloy systems based on titanium or cobalt which are widely used in both medical and aerospace technology. In particular, the titanium alloy Ti6Al4. V, possessing high strength, low density and excellent corrosion resistance exactly matches today's lightweight aspirations, and therefore will be of greater importance in the future applications. Due to this favorable combination of properties this alloy nowadays is widely used in technical specialty areas despite its high price. Therefore, many mechanically and thermally highly stressed lightweight components such as turbine blades are designed and manufactured out of this particular titanium alloy. Conventional processes used for such material systems like casting or forging methods usually consume a lot of energy when heating the billet and require increased materials usage, which results in high production-costs. In this context the processing of such materials in the semi-solid state has a great potential in terms of producing complex net-shape or near-net-shape components with good mechanical properties. © 2015 .

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