Our research focuses on material development and process technology (investment casting and powder injection molding) of high temperature alloys, in particular Nickel-base superalloys.
On the Influence of Ta and Ti on Heat-Treatability and γ/γ'-Partitioning of High W Containing Re-Free Nickel-Based Superalloys
In: Advanced Engineering Materials (2017)
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Mikrostruktur und mechanische Eigenschaften der Nickelbasis-Superlegierung IN 713LC nach Verarbeitung im pulvermetallurgischen Spritzguss für Triebwerksanwendungen (Dissertation, 2017)
Auswirkungen der Elemente B, Zr und C auf die Korngrenzenrissbildung einer gerichtet erstarrten Nickelbasis-Superlegierung (Dissertation, 2017)
Effect of B, Zr, and C on Hot Tearing of a Directionally Solidified Nickel-Based Superalloy
In: Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 47 (2016), p. 2914-2926
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Transmission electron microscopy of a CMSX-4 Ni-base superalloy produced by selective electron beam melting
In: Metals 6 (2016), Art.Nr.: 258
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Project B1 focuses on the investigation of the newly developed FCBC (Fluidized Carbon Bed Cooling) process for the single crystalline solidification of superalloys. In comparison with commercially available investment casting processes it could be shown that FCBC benefits from a higher cooling potential. In combination with a dynamic baffle a higher axial temperature gradient will evolve. Objective of the upcoming project period is the improvement of the process understanding as well as the process optimization, carried out on a 10 kg prototype plant. A further point of interest is the exploitation of the increased microstructural homogeneity for alloy development.
Project B2 explores selective electron beam melting, which belongs to the additive manufacturing technologies, for the processing of single-crystalline superalloys. Especially the potential of the inherent high cooling rates is investigated. These lead to an ultra-fine and directional solidified microstructure. The main challenge of this project is to develop innovative processing strategies based on a sound theoretical process understanding in order to produce crack-free and preferably single crystalline samples, also with higher geometric complexity.
A new numerical tool will be explored that supports the experimental alloy developer in defining new compositions with potential for high strength. Starting with a composition space that is defined by the developer based on his metallurgical experience and his design goals, the numerical tool will propose the most promising compositions. The research program will on the one hand address open questions regarding the mathematical optimization in this application and on the other hand new models for predicting the relevant material properties.
The scientific service project of SFB/Transregio 103 takes care of the procurement and processing of all project materials.