Conference contribution
(Conference Contribution)


Development of a low-density rhenium-free single crystal nickel-based superalloy by application of numerical multi-criteria optimization using thermodynamic calculations


Publication Details
Author(s): Rettig R, Matuszewski K, Müller A, Helmer HE, Ritter N, Singer R
Editor(s): M. Hardy, E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V. Seetharaman, S. Tin
Publisher: Minerals, Metals and Materials Society
Publication year: 2016
Conference Proceedings Title: Superalloys 2016: Proceedings of the 13th Intenational Symposium of Superalloys
Pages range: 35-44
ISBN: 9781118996669

Event details
Event: 13th International Symposium on Superalloys, SUPERALLOYS 2016
Event location: Seven Springs
Start date of the event: 11/09/2016
End date of the event: 15/09/2016
Language: English

Abstract

A computational alloy design method based on numerical multicriteria global optimization is presented (termed MultOPT). Its application is demonstrated by the design of a novel rhenium-free low-density superalloy called ERBO/15. This alloy has been produced and tested on a lab-scale and results on high temperature creep strength and microstructure are presented. Despite its low density of 8.4 g/cm and despite the fact that it contains no Re, the creep strength of ERBO/15 is comparable to that of the rheniumcontaining alloy CMSX-4® 1. With our MultOPT approach, in order to identify promising compositions, large compositional spaces can be scanned and the full complexity of superalloys can be taken into consideration. It is ensured that from a mathematical point of view the best possible alloy for the given requirements is found. The alloy properties are predicted by thermodynamic CALPHAD-calculations and by an empirical model for creep strength in the high-temperature, low-stress regime: The creep strength is maximized by maximizing the weighted amount of solid solution strengthening elements in the matrix and maintaining an optimum morphology and fraction of the γ′-phase. The optimization algorithm uses Kriging surrogate models for higher performance. Additionally in order to prepare the future usage of more complex alloy property models in the optimization, an existing TCP-phase precipitation model is validated experimentally within the paper.



How to cite
APA: 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.

MLA: Rettig, Ralf, et al. "Development of a low-density rhenium-free single crystal nickel-based superalloy by application of numerical multi-criteria optimization using thermodynamic calculations." Proceedings of the 13th International Symposium on Superalloys, SUPERALLOYS 2016, Seven Springs Ed. M. Hardy, E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V. Seetharaman, S. Tin, Minerals, Metals and Materials Society, 2016. 35-44.

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