On the effects of heat treatments on the creep behaviour of a single crystal superalloy

Caron, Pierre; Henderson, Pamela; Khan, T.; McLean, M.

doi:10.1016/0036-9748(86)90458-8

Cited by 84 publications

(38 citation statements)

References 7 publications

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“…Under these circumstances, creep deformation is best limited by a uniform and regular precipitate structure. [10,28] In fact, creep relaxation occurs during TMF testing, as can be seen at the hot end of the first TMF cycle for microstructures 1 through 3 ( Figure 22). One can see that microstructure 1 exhibits superior creep relaxation behavior at both mechanical strain range conditions considered.…”

Section: Discussion: On the Damage Mechanisms Occurring In Tmfmentioning

confidence: 97%

On the Mechanical Behavior of a New Single-Crystal Superalloy for Industrial Gas Turbine Applications

Sato

Moverare

Hasselqvist

et al. 2012

Metall Mater Trans A

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Section: Discussion: On the Damage Mechanisms Occurring In Tmfmentioning

confidence: 97%

On the Mechanical Behavior of a New Single-Crystal Superalloy for Industrial Gas Turbine Applications

Sato

Moverare

Hasselqvist

et al. 2012

Metall Mater Trans A

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“…Actually, Ni-based single crystal superalloys exhibit superior creep resistance at temperature as high as 1100°C [2] due to their particular microstructure, consisting of 70% in volume of coherently precipitated γ' cubes (L1 2 lattice) separated by thin channels of face centered cubic (fcc) γ matrix [3]. Extensive literature is devoted to the study of their properties, especially on isothermal creep over a wide range of stress and temperature [4][5][6][7][8][9][10][11]. Two temperature/stress domains can be distinguished: (1) at low temperature (T < 950°C) and high stress, no significant evolution of the initial optimal microstructure occurs during the creep experiment, while (2) at higher temperature/lower stress, great modifications of the microstructure are observed during primary creep stage: rafting of the γ' phase perpendicular to the applied stress for negative γ/γ' misfit alloys and development of stable dislocation networks at the γ/γ' interfaces.…”

Section: Introductionmentioning

confidence: 99%

Non-Isothermal Creep Behavior of a Second Generation Ni-Based Single Crystal Superalloy: Experimental Characterization and Modeling

Cormier¹,

Milhet²,

Vogel³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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In order to simulate emergency regimes possibly encountered by turboshaft engines for helicopter, non-isothermal creep behavior of the second generation single crystal Ni-Based superalloy MC2 was investigated. These tests were performed with one short overheating at 1200°C during the isothermal creep life of the material at 1050°C. Overheatings were carried out using a burner rig designed to achieve temperature jumps as fast as 60°C/s in the range 1050°C-1200°C. Both the overheating duration and its position during the isothermal creep life at 1050°C of the material have a great effect on the non-isothermal creep behavior. The modifications in creep behavior were clearly linked with microstructural evolutions occurring during temperature changes, e.g: the dissolution of the γ' phase on heating the material and the dislocation recovery processes.Based on these microstructure characterizations, a classical macroscopic model involving isotropic variables and a von Mises criterion was enhanced with the addition of new internal variables representative of the γ'-volume fraction and a recovery function attesting for the dislocation activity.

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“…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%

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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On the effects of heat treatments on the creep behaviour of a single crystal superalloy

Cited by 84 publications

References 7 publications

On the Mechanical Behavior of a New Single-Crystal Superalloy for Industrial Gas Turbine Applications

On the Mechanical Behavior of a New Single-Crystal Superalloy for Industrial Gas Turbine Applications

Non-Isothermal Creep Behavior of a Second Generation Ni-Based Single Crystal Superalloy: Experimental Characterization and Modeling

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

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