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17–19 Sept 2018
Fakultät für Maschinenwesen der Technischen Universität München
Europe/Berlin timezone

Structure investigation of the new VDM Ni-based superalloy 780 Premium

18 Sept 2018, 16:00
1h 30m
Fakultät für Maschinenwesen der Technischen Universität München

Fakultät für Maschinenwesen der Technischen Universität München

Boltzmannstraße 15 85748 Garching b. München
Poster P8 Functional materials and materials science Poster session 2

Speaker

Cecilia Solis

Description

Ni-based superalloys are used for high temperature (T) applications that require good mechanical properties. Among these alloy 718 is the most widely used with operation T up to 650 °C. In this alloy the austenitic matrix is strengthened by $\gamma$’-Ni3Al and $\gamma$’’-Ni3Nb precipitates. Other phases that can be formed are $\delta$-Ni3Nb and $\eta$-Ni3Ti. The existence of the different phases, quantity and shape of the precipitates depend on composition, heat treatment and processing conditions. It is crucial to control their evolution at high T in order to tailor the mechanical properties. The aim of increasing the operation T forces the development of materials stable at higher T. Waspaloy has higher amount of $\gamma$' phase which allows its use at higher T but has a poor hot formability. The alloy 718Plus improves the performance at high T and it is expected easier processing. With improved composition new VDM alloy 780 Premium has been developed for higher service T and its structure and performance is under investigation.
This work presents the in-situ structural characterization of the new VDM alloy 780 Premium after three different aging conditions by means of neutron and X-ray diffraction at room T and elevated T. The morphology of the different phases is studied by scanning electron microscopy and small angle neutron scattering. Furthermore, the solvus T of the different phases is determined and the structural properties correlated with hardening of the materials.

Primary author

Cecilia Solis

Co-authors

Johannes Munke Mr Martin Bergner (Institut für Werkstoffe, Technische Universität Braunschweig) Armin Kriele Martin Muehlbauer Michael Hofmann Dr Denis Cheptiakov (Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut) Sebastian Muehlbauer Dr Bodo Gehrmann (VDM Metals International GmbH) Prof. Joachim Rösler (Institut für Werkstoffe, Technische Universität Braunschweig) Ralph Gilles

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