Elevated temperature creep-rupture behavior of the single crystal nickel-base superalloy NASAIR 100

Nathal, M. V.; Ebert, L. J.

doi:10.1007/bf02814341

Cited by 128 publications

(54 citation statements)

References 27 publications

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“…In an ideal situation, with y'-rafts extending from one side of the crystal to the other in an almost perfectly regular manner, gliding/climbing around it by matrix dislocations is impossible. This conclusion is in accordance with opinions of other authors [ 1,13,21,23,24]. Another example for enhanced creep properties due to tensile pre-rafting can be found in [25].…”

Section: Introductionsupporting

confidence: 92%

“…Over the last three decades, the effects of rafting on the creep behaviour have been discussed controversially in a number of papers [2,7,11,12,13,14]. It has to be mentioned that, in these investigations, all raft structures formed during tensile creep (for 6~0) and were oriented perpendicular to the stress axis.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, several authors suggest that a raft structure perpendicular to the stress axis can, under the condition of high temperatures and very low stresses, lead to an increase of the creep strength [2,7,13,17,18], as long as cutting of the rafts, which seems to be facilitated compared to cuboidal y/y'-microstructures, is avoided. In these cases, it is assumed, that under these conditions a raft structure becomes an effective barrier against dislocation by-passing by glide-climb motion along the y/y-interfaces.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the High-Temperature Tensile Creep Strength of Monocrystalline Nickel-Base Superalloys by Pre-rafting in Compression

Tetzlaff¹,

Mughrabi²

2000

Superalloys 2000 (Ninth International Symposium)

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In recent years, the development of Y.-hardened monocrystalline nickel-base superalloys focused on different aspects of alloy composition and microstructural refinement. In particular, the formation of so-called y/y'-raft structures, lying typically, in the case of a negative y/y'-lattice misfit 6, perpendicular to the stress axis during high-temperature tensile creep had attracted much attention. Unfortunately, this microstructural transformation leads in most cases to deteriorated creep properties. Earlier attempts to prevent rafting by suitable prior annealing treatments had been in so far unsuccessful, that while the applied annealing treatment retarded raft formation, it inevitably lead to microstructural coarsening accompanied by creep acceleration. The goal of the present extensive study is to show that suitable pre-rafting in compression, leading to a y/y'-raft structure parallel to the stress axis in the case of a negative lattice misfit, enhances not only the isothermal hightemperature fatigue strength, as shown earlier, but also the hightemperature creep properties. The observed macroscopic creep behaviour will be discussed with reference of microstructural observations.

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Section: Introductionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancement of the High-Temperature Tensile Creep Strength of Monocrystalline Nickel-Base Superalloys by Pre-rafting in Compression

Tetzlaff¹,

Mughrabi²

2000

Superalloys 2000 (Ninth International Symposium)

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“…and p in NASAIR 100 (35 (1,20) and Khan (37) concluded that microporosity appeared t o be a more significant defect than the small quantities of p phase in the materials studied. …”

Section: Removal Of Co Also Resulted In Precipitation Of the W-rich Pmentioning

confidence: 99%

Microstructure-Property Relationships in Directionally Solidified Single-Crystal Nickel-Base Superalloys

MacKay

Nathal

1988

MiCon 86: Optimization of Processing, Properties, and Service Performance Through Microstructural Control

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This paper discusses some of the microstructural features which influence the creep properties of directionally solidified and single-crystal nickel-base superalloys. Gamma prime precipitate size and morphology, γ-γ' lattice mismatch, phase instability, alloy composition, and processing variations are among the factors considered. Recent experimental results are reviewed and related to the operative deformation mechanisms and to the corresponding mechanical properties. Special emphasis is placed on the creep behavior of single-crystal superalloys at high temperatures, where directional γ' coarsening is prominent, and at lower temperatures, where γ' coarsening rates are significantly reduced. It can be seen that very subtle changes in microstructural features can have profound effects on the subsequent properties of these materials.

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“…[40,48] In contrast, Huo et al's [13] experimental results show that an 8 wt pct addition of Co can slightly reduce the c¢ volume fraction to 3 pct. This mismatch reflects the complex effect of Co on c¢ precipitation, which can be ascribed to the effect of Co on altering the c/c¢ partitioning behavior of other alloying elements.…”

Section: Co Effectmentioning

confidence: 90%

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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Elevated temperature creep-rupture behavior of the single crystal nickel-base superalloy NASAIR 100

Cited by 128 publications

References 27 publications

Enhancement of the High-Temperature Tensile Creep Strength of Monocrystalline Nickel-Base Superalloys by Pre-rafting in Compression

Enhancement of the High-Temperature Tensile Creep Strength of Monocrystalline Nickel-Base Superalloys by Pre-rafting in Compression

Microstructure-Property Relationships in Directionally Solidified Single-Crystal Nickel-Base Superalloys

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

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