Journal article
(Original article)


Improved creep strength of nickel-base superalloys by optimized γ/γ′ partitioning behavior of solid solution strengthening elements


Publication Details
Author(s): Pröbstle M, Neumeier S, Feldner P, Rettig R, Helmer HE, Singer R, Göken M
Publisher: Elsevier
Publication year: 2016
Volume: 676
Pages range: 411-420
ISSN: 0921-5093
Language: English

Abstract

Solid solution strengthening of the γ matrix is one key factor for improving the creep strength of single crystal nickel-base superalloys at high temperatures. Therefore a strong partitioning of solid solution hardening elements to the matrix is beneficial for high temperature creep strength. Different Rhenium-free alloys which are derived from CMSX-4 are investigated. The alloys have been characterized regarding microstructure, phase compositions as well as creep strength. It is found that increasing the Titanium (Ti) as well as the Tungsten (W) content causes a stronger partitioning of the solid solution strengtheners, in particular W, to the γ phase. As a result the creep resistance is significantly improved. Based on these ideas, a Rhenium-free alloy with an optimized chemistry regarding the partitioning behavior of W is developed and validated in the present study. It shows comparable creep strength to the Rhenium containing second generation alloy CMSX-4 in the high temperature / low stress creep regime and is less prone to the formation of deleterious topologically close packed (TCP) phases. This more effective usage of solid solution strengtheners can enhance the creep properties of nickel-base superalloys while reducing the content of strategic elements like Rhenium.



How to cite
APA: 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

MLA: Pröbstle, Martin, et al. "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 (2016): 411-420.

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