Solution heat treatment response of a third generation single crystal Ni-base superalloy

Fuchs, G.E.

doi:10.1016/s0921-5093(00)01776-7

Cited by 270 publications

(76 citation statements)

References 3 publications

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“…Of all solute elements that were presented in Table II, Ti and heavy refractory elements such as Re, Ta, and W exhibited particularly strong segregation tendency. This segregation tendency was found to be comparable with those reported for dendritically solidified commercial single crystal superalloys [3,4,7,11] and model single crystal superalloys [6,23]. (Table II).…”

supporting

confidence: 84%

“…For this reason, the total amount of refractory alloying addition has been gradually increased in the advanced Ni-base superalloys [1,2]. However, the refractory elements segregate severely during solidification [3,4], which often lead to a number of problems such as (i) interdendritic porosity [5], (ii) misoriented grains [6], (iii) freckle formation [6,7], (iv) localized phase instability [8,9], and (v) formation of topologically close-packed (TCP) phases [9,10]. While some of these problems were mitigated by the complex step-wise homogenization heat treatment, most result in increased scrap rates.…”

Section: Introductionmentioning

confidence: 99%

“…Of the techniques available, random sampling approach, which is commonly known as point matrix scan technique, is widely used for characterizing microsegregation in Ni-base superalloys [3,4,7,[11][12][13][14]. This technique has become prevalent because it allows characterizing microsegregation with no dependence on the plane of examination and simply provides a continuous profile with respect to the fraction of solid ( s ).…”

Section: Introductionmentioning

confidence: 99%

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Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

Seo

Lee

Yoo

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The solute redistribution behavior during directional solidification of the alloy CMSX-10 with planar and dendritic solid/liquid (S/L) interfaces has been investigated by directional solidification and quenching (DSQ) technique. In particular, the elemental partitioning coefficient during the solidification of primary γ and γ/γ′ eutectic was quantitatively estimated by electron probe microanalysis (EPMA) on the sample quenched during planar growth of primary γ and γ/γ′ eutectic, respectively. The EPMA compositional profiles clearly revealed that Scheil solidification occurs during the solidification of primary γ with planar S/L interface. Based on this result, the evolution of γ/γ′ eutectic volume fraction with respect to the solidification rate in dendritic solidification regimes could be rationalized by considering the back-diffusion effect on decreasing the extent of microsegregation. The comparison of the compositional profiles of Cr in the planar grown DSQ sample and the local distribution of Cr in dendritically solidified sample indicated that the solidification of the alloy CMSX-10 completes with the formation of supersaturated γ phase after the γ/γ′ eutectic reaction.

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supporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

Seo

Lee

Yoo

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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“…[9,10] After casting single crystal superalloys are thus commonly heat treated in order to remove microsegregation, to control the size and shape of the c¢ precipitates and hence optimize creep behavior. [11][12][13][14] During casting and solidification itself, elemental segregation can lead to the formation of casting defects such as freckles, which destroy the single crystalline structure of the material. [15][16][17] It becomes apparent that knowledge of the solidification behavior of single crystal superalloys is important for the design of these alloys and the understanding of the manufacturing processes.…”

Section: Introductionmentioning

confidence: 99%

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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“…With the increase of thrustweight ratio and operation temperature for aircraft engines, the requirement for superalloys on their high temperature capability is getting higher and higher year by year. In order to increase the service temperature of single crystal nickel base superalloys, large amount of refractory alloying elements, such as W, Mo, Nb, Ta, Re, have been used [1,2] . It has been found that the addition of rhenium plays an important role on high temperature creep resistance in single crystal nickel base superalloys [3,4] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Ruthenium on Microstructure and Stress Rupture Properties of a Single Crystal Nickel-Base Superalloy

Yan¹,

Ma²,

Dong³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The effect of Ru on microstructure and stress rupture properties of an advanced Ni base single crystal alloy has been investigated. The experimental results showed that the addition of 4 wt.% Ru had hardly effect on the phase precipitation behavior of as-cast alloy, i. e., the microstructure is composed of γ and γ' phases for both Ru free and Ru containing alloys. However, under the heat treatments of 1305℃-1315 /16h ℃ solutioning and 1140℃/4h＋ 870 /20h ℃ aging, and the thermal exposure under 1100 /1000h, ℃ the addition of 4 wt.% Ru restrained the precipitation and growth of TCP phase evidently, and increased the rafting structure tendency of γ/γ' phases. The results of stress rupture tests showed that the addition of 4 wt.% Ru in the alloy improved the stress rupture lives significantly for as-cast, as-heat treated and thermal exposed samples. The improvement of the stress rupture properties may be attributed to the restraint of μ phase precipitation and growth by the proper addition of Ru.

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Solution heat treatment response of a third generation single crystal Ni-base superalloy

Cited by 270 publications

References 3 publications

Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

Studies on the Solidification Path of Single Crystal Superalloys

Effect of Ruthenium on Microstructure and Stress Rupture Properties of a Single Crystal Nickel-Base Superalloy

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