Activity Development of high temperature alloys

Internally funded project


Project Details

Project leader:
Prof. Dr.-Ing. Robert Singer


Contributing FAU Organisations:
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)

Start date: 01/01/1990


Research Fields

High Temperature Materials
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Abstract (technical / expert description):


We focuse on the development of new alloys for the requirements of industry as well as on clarifying scientific questions. Numerical tools based on CALPHAD (Calculation of Phase Diagrams) calculations as well as further property modeling approaches are used to predict thermomechanical properties of the materials and to optimize them in terms of the desired characteristics. For this purpose the software tool MultOpt was developed. In general, the potential of promising alloys are a compromise between various relevant properties, which are represented in the form of Pareto fronts. The user can decide which alloy is fitting best by weighting up the importance of the conflicting properties. The numerically determined alloy is then cast by an institute own Bridgman furnace. The numerical tool HeatOpt, a coupling of CALPHAD with the phase field method, is used to determine suitable heat treatment parameters, which are applied after alloy manufacturing. Furthermore, the alloys are characterized in terms of their microstructures and mechanical properties. The values determined experimentally are compared with the previously calculated values and an adaptation of the respective numerical modeling is carried out for data with a large discrepancy.


Publications
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Ritter, N., Sowa, R., Schauer, J.C., Gruber, D., Göhler, T., Rettig, R.,... Singer, R. (2018). Effects of Solid Solution Strengthening Elements Mo, Re, Ru, and W on Transition Temperatures in Nickel-Based Superalloys with High γ′-Volume Fraction: Comparison of Experiment and CALPHAD Calculations. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science. https://dx.doi.org/10.1007/s11661-018-4730-0
Ritter, N., Schesler, E., Müller, A., Rettig, R., Körner, C., & Singer, R. (2017). On the Influence of Ta and Ti on Heat-Treatability and γ/γ'-Partitioning of High W Containing Re-Free Nickel-Based Superalloys. Advanced Engineering Materials. https://dx.doi.org/10.1002/adem.201700150
Rettig, R., Matuszewski, K., Müller, A., Helmer, H.E., Ritter, N., & Singer, R. (2016). Development of a low-density rhenium-free single crystal nickel-based superalloy by application of numerical multi-criteria optimization using thermodynamic calculations. In M. Hardy, E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V. Seetharaman, S. Tin (Eds.), Superalloys 2016: Proceedings of the 13th Intenational Symposium of Superalloys (pp. 35-44). Seven Springs, US: Minerals, Metals and Materials Society.
Goehler, T., Schwalbe, C., Svoboda, J., Affeldt, E., & Singer, R. (2016). Discussing the effect of gamma prime coarsening on high temperature low stress creep deformation with respect to the role of refractory elements. In M. Hardy, E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V. Seetharaman, S. Tin (Eds.), Superalloys 2016: Proceedings of the 13th Intenational Symposium of Superalloys (pp. 655-664). Seven Springs, US: Minerals, Metals and Materials Society.
Pröbstle, M., Neumeier, S., Feldner, P., Rettig, R., Helmer, H.E., Singer, R., & Göken, M. (2016). Improved creep strength of nickel-base superalloys by optimized γ/γ′ partitioning behavior of solid solution strengthening elements. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 676, 411-420. https://dx.doi.org/10.1016/j.msea.2016.08.121
Matuszewski, K. (2016). Precepetation of Topologically Close Packed Phases in Ni-base Superalloys - the Effect of Re and Ru (Dissertation).
Matuszewski, K., Rettig, R., Matysiak, H., Peng, Z., Povstugar, I., Choi, P.,... Singer, R. (2015). Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and 4th generation. Acta Materialia, 95, 274-283. https://dx.doi.org/10.1016/j.actamat.2015.05.033
Peng, Z., Povstugar, I., Matuszewski, K., Rettig, R., Singer, R., Kostka, A.,... Raabe, D. (2015). Effects of Ru on elemental partitioning and precipitation of topologically close-packed phases in Ni-based superalloys. Scripta Materialia, 101, 44-47. https://dx.doi.org/10.1016/j.scriptamat.2015.01.014
Matuszewski, K., Müller, A., Ritter, N., Rettig, R., Kurzydłowski, K., & Singer, R. (2015). On the Thermodynamics and Kinetics of TCP Phase Precipitation in Re- and Ru- Containing Ni-base Superalloys. Advanced Engineering Materials, 17(8), 1127-1133. https://dx.doi.org/10.1002/adem.201500173
Rettig, R., Ritter, N., Müller, F., Franke, M., & Singer, R. (2015). Optimization of the Homogenization Heat Treatment of Nickel-Based Superalloys Based on Phase-Field Simulations: Numerical Methods and Experimental Validation. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 46(12), 5842-5855. https://dx.doi.org/10.1007/s11661-015-3130-y

Last updated on 2018-15-10 at 11:54