Dependence of creep strength on the interfacial dislocations in a fourth generation SC superalloy TMS-138

Zhang, J.X.; Murakumo, T.; Harada, Hiroshi; Koizumi, Yutaka

doi:10.1016/s1359-6462(02)00379-2

Cited by 187 publications

(76 citation statements)

References 13 publications

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“…Early studies on the addition of Ru to single crystal nickel-base superalloys reported a reduced propensity for formation of topologically close-packed (TCP) phases and improved creep rupture strength at 1100°C [3]. Additional investigations have verified a lower tendency for formation of TCP phases [1, 4,5] and an improved creep resistance at 1100°C in alloys containing 2 to 5 wt% Ru [4,6]. The mechanisms by which Ru additions improve high temperature microstructural stability are still not well understood [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…To date, investigations of Ru-containing nickel-base superalloys have considered a relatively narrow range of composition [5,6] with Ru additions of up to 3 wt% [3,5,6]. Additionally, the improvements in creep rupture life of Ru-containing superalloys that have been reported are at and/or above 1100°C [3,4,6].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the improvements in creep rupture life of Ru-containing superalloys that have been reported are at and/or above 1100°C [3,4,6]. Caron reported improved creep resistance of Ru-containing nickel-base superalloys at 1150°C, but not at 950°C [4].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

Rowland¹,

Feng²,

Pollock³

2004

Superalloys 2004 (Tenth International Symposium)

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Nickel-base single crystal superalloys with Ru additions of 5.7 to 9.7 wt%, moderate amounts of refractory elements and up to 6.7 wt% Cr were investigated. The ' precipitate morphology of the experimental alloys was cuboidal, near-spherical and intermediately-shaped depending on the Cr and Ru content. The time to 1% creep and the creep rupture lives of the experimental alloys were measured at 950°C and 290 MPa. Within the set of alloys investigated rafting occurred parallel to the axis of the applied uniaxial tensile stress, perpendicular to the applied stress or was completely suppressed, suggesting a wide range of lattice misfit. Interfacial dislocation network development during creep also varied widely among the alloys investigated. The possibilities for control of microstructure and high temperature properties via Ru additions are discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

Rowland¹,

Feng²,

Pollock³

2004

Superalloys 2004 (Tenth International Symposium)

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“…For example, Al and Ta are the main c¢ forming elements and higher levels of these elements can effectively increase the c¢ volume fraction. [37] Mo and Co partition preferentially in c matrix and play as strong solid-solution-strengthening elements to elevate the creep properties, [38][39][40] while Co addition helps to reduce the tendency to form TCP phases. [41,42] Cr was found to increase the c¢ volume fraction [38] but deteriorates the microstructural stability at high level of concentration.…”

Section: A Effect Of Alloying Element On Microstructure and Creep Prmentioning

confidence: 99%

The Compositional Dependence of the Microstructure and Properties of CMSX-4 Superalloys

Zwaag

2017

Metall Mater Trans A

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The degradation of creep resistance in Ni-based single-crystal superalloys is essentially ascribed to their microstructural evolution. Yet there is a lack of work that manages to predict (even qualitatively) the effect of alloying element concentrations on the rate of microstructural degradation. In this research, a computational model is presented to connect the rafting kinetics of Ni superalloys to their chemical composition by combining thermodynamics calculation and a modified microstructural model. To simulate the evolution of key microstructural parameters during creep, the isotropic coarsening rate and c/c¢ misfit stress are defined as composition-related parameters, and the effect of service temperature, time, and applied stress are taken into consideration. Two commercial superalloys, for which the kinetics of the rafting process are selected as the reference alloys, and the corresponding microstructural parameters are simulated and compared with experimental observations reported in the literature. The results confirm that our physical model not requiring any fitting parameters manages to predict (semiquantitatively) the microstructural parameters for different service conditions, as well as the effects of alloying element concentrations. The model can contribute to the computational design of new Ni-based superalloys.

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“…The elemental electron hole numbers, Nv, of these new single crystal alloys were controlled within the values smaller than 2 to increase the microstructure stability for high temperature service of the alloys. There have been quite few reports on the effect of Ru on the microstructure and stress rupture properties of single crystal superalloys [6][7][8][9][10] .…”

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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Dependence of creep strength on the interfacial dislocations in a fourth generation SC superalloy TMS-138

Cited by 187 publications

References 13 publications

Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

The Compositional Dependence of the Microstructure and Properties of CMSX-4 Superalloys

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

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