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919 Aktuelle Fachpublikationen in Materialwissenschaft und Werkstofftechnik

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Formation of the reaction zone between tin‐copper brazing fillers and aluminum‐silicon‐magnesium alloys: Experiments and thermodynamic analysis

10.01.2018 | K. Bobzin, M. Öte, S. Wiesner, A. Schmidt, M. Apel, R. Berger, A. Aretz, J. Mayer, Materialwissenschaft und Werkstofftechnik, 2018

Abstract A primary challenge in brazing is the controlled formation of phases resulting from interactions of elements of the liquid filler metal with those of the base material. The morphology of the brazed joint, which is decisive for the mechanical properties of the joint, is influenced by ...

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Effective thermal properties of an isotactic polypropylene (α‐iPP) injection moulded part by a multiscale approach

10.01.2018 | G. Laschet, M. Apel, J. Wipperfürth, C. Hopmann, M. Spekowius, R. Spina, Materialwissenschaft und Werkstofftechnik, 2018

Abstract In injection moulding processes, the melt undergoes a complex deformation and cooling history, which results in an inhomogeneous distribution of crystalline superstructures in semi-crystalline thermoplastics, which significantly influences their final mechanical and thermal ...

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Investigation on the transferability of algorithms for the numerical optimization of cooling channel design in injection molding on metal gravity die casting

10.01.2018 | C. Hopmann, T. Schneppe, M. Theunissen, A. Bührig-Polaczek, N. Wolff, Materialwissenschaft und Werkstofftechnik, 2018

Abstract The thermal mold design and the identification of a proper cooling channel design are primordial steps in the development of complex molds for injection molding. In order to find a suitable cooling channel system, a lot of effort is needed to avoid part warpage after solidification. ...

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Influence on martensite‐start‐temperature and volume expansion of low‐transformation‐temperature materials used for residual stress relief in beam welding

10.01.2018 | U. Reisgen, S. Olschok, R. Sharma, S. Gach, Materialwissenschaft und Werkstofftechnik, 2018

Abstract Low-transformation-temperature materials (LTT) are used as high-alloy welding filler material for high-strength steels in order to minimize the tensile stresses and resulting distortion of the component during the welding process. The increase in the volume of the structure produced ...

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Hybrid simulation of laser deep penetration welding

10.01.2018 | C. Schöler, A. Haeusler, V. Karyofylli, M. Behr, W. Schulz, A. Gillner, M. Niessen, Materialwissenschaft und Werkstofftechnik, 2018

Abstract In laser deep penetration welding, the knowledge on the temperature history of the material is of great interest for the assessment of the quality properties of the weld. For this purpose a hybrid process model that enables the fast calculation of temperature distributions as a ...

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Determination and verification of the gap dependent heat transfer coefficient during permanent mold casting of A356 aluminum alloy

10.01.2018 | M. Ahmadein, B. Pustal, N. Wolff, A. Bührig-Polaczek, Materialwissenschaft und Werkstofftechnik, 2018

Abstract In complex castings, the heat transfer across the casting / mold interface depends on the local gap size and contact pressure. Thus, an experimental setup is constructed to measure and evaluate the air-gap dependent heat transfer coefficient during solidification of an A356 permanent ...

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Numerical investigation of droplet impact on the welding pool in gas metal arc welding

10.01.2018 | O. Mokrov, O. Lysnyi, M. Simon, U. Reisgen, G. Laschet, M. Apel, Materialwissenschaft und Werkstofftechnik, 2018

Abstract A transient three-dimensional model that describes physical phenomena inside a welding pool during gas–metal arc welding process is presented. The model considers such phenomena as heat-mass transfer, electromagnetics, hydrodynamic processes and deformation of the weld pool free ...

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Residual stress measurement in AlSi alloys

10.01.2018 | U. Reisgen, R. Sharma, S. Gach, S. Olschok, J. Francis, K. Bobzin, M. Oete, S. Wiesner, M. Knoch, A. Schmidt, Materialwissenschaft und Werkstofftechnik, 2018

Abstract In this work, the relaxation of residual stresses inside a sample made of the aluminum alloy AlSi7Mg0.3 after tempering is described. The comparison of stress evaluation by X-ray diffraction and incremental hole drilling method combined with electronic speckle pattern interferometry ...

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An automatable algorithm for measurement of fluid flow during laser fusion cutting using in‐situ trim cut analysis

10.01.2018 | U. Jansen, D. Arntz, D. Petring, W. Schulz, R. Poprawe, Materialwissenschaft und Werkstofftechnik, 2018

Abstract Irregularities inside the fluid flow in laser fusion cutting of sheet metals cause quality defects like large striation depths or adhered dross. Trim-cut analysis is used to measure the flow velocities of the molten material by high speed imaging. The so-called streak analysis creates ...

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Novel discretization methods for improved simulation precision in injection molding

10.01.2018 | V. Karyofylli, M. Behr, M. Schmitz, C. Hopmann, Materialwissenschaft und Werkstofftechnik, 2018

Abstract Mold filling is an important stage of injection molding, which is one of the most commonly used manufacturing processes for the production of thermoplastic components in high volumes. As a consequence, the numerical simulation of this process based on computational fluid dynamics ...

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