Investigation of the final stages of solidification and eutectic phase formation in Re and Ru containing nickel-base superalloys

Heckl, A.; Rettig, Ralf; Cenanovic, S.; Göken, Mathias; Singer, Robert F.

doi:10.1016/j.jcrysgro.2010.03.041

Cited by 59 publications

(45 citation statements)

References 21 publications

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“…Re and Ru were added stepwise in the range of 0-2 at.-% to the base alloy Astra1-00 at the expense of Ni, while all other alloying elements are retained at constant at.-% levels (Table 1). Further details about in-house alloy fabrication, implemented quality controls and casting conditions are stated elsewhere [12,13]. To assure a statistically meaningful number of tensile creep samples with identical casting conditions, the experimental alloys and the reference alloy CMSX-4 were directionally solidified (DS) as a set of three cylindrical bars (12 mm in diameter and 180 mm in length).…”

Section: Methodsmentioning

confidence: 99%

Creep Rupture Strength of Re and Ru Containing Experimental Nickel-Base Superalloys

Heckl

Rettig

Singer

2011

AMR

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Abstract. The influence of Re and Ru on creep rupture strength has been investigated using a new in-house designed alloy-series comprising 9 experimental nickel-base superalloys with stepwise increased Re and Ru additions. The presented creep data reveals a significant increase in creep rupture strength by additions of Re. For additions of Ru an increase of creep rupture strength can only be found for low Re contents. The present article, which is part of an extensive and systematic investigation on Re and Ru influences, shows, that an improved creep resistance by an influence of Re and Ru on the γ'-solvus temperature is rather improbable. Likewise, the influence of Re and Ru on liquidus temperature is not expected to play an important role. However, the creep rupture strength is suggested to be highly modified by γ/γ'-microstructure changes.

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Section: Methodsmentioning

confidence: 99%

Creep Rupture Strength of Re and Ru Containing Experimental Nickel-Base Superalloys

Heckl

Rettig

Singer

2011

AMR

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“…5) result from the different observation plane and their distance from the fine γ/γ' centre. Graphical 3D illustration of the parent eutectic starting with a fine γ/γ' structure in the centre, the spatial expansion changes into a coarsening finger-shaped γ' with small γ channels, what is described in the work [11].…”

Section: Resultsmentioning

confidence: 99%

The Impact of the Thickness of the Ceramic Shell Mould on the (γ + γ′) Eutectic in the IN713C Superalloy Airfoil Blade Casting

Nawrocki

Pietraszek

2017

Archives of Metallurgy and Materials

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In the study the wall thickness of ceramic shell mould influence on (γ + γ') eutectic in the IN713C nickel-based superalloy airfoil blade casting was described.Two castings formed as a blade from two wax pattern assemblies were analysed. In the experiment in one pattern the thick ceramic layer was obtained on pressure side and in another one on suction side of the airfoil blade. The microstructure of the crosssections of the castings were observed on polished and etched metallographic specimens. The microstructure and phases chemical compositions of specimens was analyzed by using the scanning electron microscope Hitachi S-4200 equipped with EDS. It was established, that wall thickness of ceramic shell mould affect size, shape and volume fraction of (γ + γ') eutectic islands in airfoil blade made from IN713C superalloy.The analysis was provided in accordance to the typical statistical methodology [1].

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“…This general trend and the segregation pattern surrounding interdendritic c¢ have also been reported of other alloys. [34,35] The actual values of the partition coefficients however do depend on the overall alloy composition as shown by Hobbs et al [26] and attempts have been made to minimize microsegregation through additions of for example Ru. [36] The weak partitioning of Cr during the early stages of solidification has led to some surprising findings however.…”

Section: Microsegregation and Solidification Sequencementioning

confidence: 99%

“…Hence the interdendritic c¢ has the same crystallographic orientation as at least one of the adjacent dendrites. [8,35] Figure 6 shows Electron Backscatter Diffraction (EBSD) measurements on interdendritic c¢ and surrounding dendrites located on a grain boundary. [42] The two different orientations are marked using squares and triangles respectively.…”

Section: Formation Of Interdendritic C¢mentioning

confidence: 99%

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Studies on the Solidification Path of Single Crystal Superalloys

Warnken

2016

J. Phase Equilib. Diffus.

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Single crystal superalloys are widely used in high temperature sections of turbines, where they are able to withstand extended exposure to high temperatures. As these alloys are commonly cast and directionally solidified via the Bridgman process, the knowledge of their solidification path is of great importance. This paper gives an overview of aspects of the solidification path in superalloys, as studied experimentally and from a modeling and simulation point of view. The implications of microsegregation, and sequence of phase formation are discussed. Attention is given to the processes leading to the formation of interdendritic c¢, also often referred to as the c/c¢ eutectic.

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Investigation of the final stages of solidification and eutectic phase formation in Re and Ru containing nickel-base superalloys

Cited by 59 publications

References 21 publications

Creep Rupture Strength of Re and Ru Containing Experimental Nickel-Base Superalloys

Creep Rupture Strength of Re and Ru Containing Experimental Nickel-Base Superalloys

The Impact of the Thickness of the Ceramic Shell Mould on the (γ + γ′) Eutectic in the IN713C Superalloy Airfoil Blade Casting

Studies on the Solidification Path of Single Crystal Superalloys

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