Damage accumulation during creep deformation of a single crystal superalloy at 1150°C

Reed, Roger C.; Cox, D. C.; Rae, C.M.F.

doi:10.1016/j.msea.2006.11.101

Cited by 159 publications

(81 citation statements)

References 23 publications

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“…Moreover one can also notice that after thermal cycling creep, raft edge and in some case the whole raft itself start to rotate away from the N orientation, principally at 1150°C and 80MPa. Such reorientation of the rafts has been proven to be associated to a local damage of the superalloy [7,22]. According to a procedure previously established by Fredholm [23] and used by Caron et al [24], image analysis software Visilog® allowed to measure the specific connectivity number of the γ' phase N A (γ').…”

Section: Creep Test Resultsmentioning

confidence: 99%

“…These results confirm after previous studies [5,13] the importance of two thermal cycle parameters, as well as the high temperature level: the high temperature dwell duration during the thermal cycle and the number of thermal cycles. In fact, during an isothermal creep test performed at 1150°C the γ' volume fraction may drop down to 45% [22] as compared to the initial 70%. Any low temperature incursion may thus lead to the re-precipitation of γ' particles, often reported as "secondary" precipitates [5,22,30].…”

Section: Discussionmentioning

confidence: 97%

“…In fact, during an isothermal creep test performed at 1150°C the γ' volume fraction may drop down to 45% [22] as compared to the initial 70%. Any low temperature incursion may thus lead to the re-precipitation of γ' particles, often reported as "secondary" precipitates [5,22,30]. During the thermal cycle, this re-precipitation is necessarily followed by some dissolution upon heating again at 1150°C as shown by the quantitative analysis of γ' precipitates along the thermal cycle [12,29].…”

Section: Discussionmentioning

confidence: 97%

“…Moreover setting the high temperature level to 1050°C limits the γ' dissolution. The γ' volume fraction was measured in the literature to be about 55-60% at 1050°C [22]. The less important gap of γ' volume fraction between low and high temperature levels and the smaller number of re-precipitation -dissolution sequences result in a less pronounced destabilization of the rafted morphology and thus a less severe effect of thermal cycling on creep.…”

Section: Discussionmentioning

confidence: 99%

“…Even though the TCP phase precipitation is not very large in the observed samples, the accelerated and accentuated growth of this layer during thermal cycling tests could have some detrimental effects on the creep behavior of thinwalled pieces of CMSX-4. According to notably Reed et al [22] the TCP particles act as sites for the nucleation pores. Two forms of porosity are then observed: casting porosity, which is predominantly in the interdendritic regions, and porosity in association with the TCP particles, which will have formed via the condensation of vacancies.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Goti¹,

Viguier²,

Crabos³

2012

Superalloys 2012 (Twelfth International Symposium)

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Effect of thermal cycling on high temperature creep of thin-walled and coated CMSX-4 single crystal superalloy was evaluated by performing thermal cycling and isothermal creep tests at 1050°C and 140 MPa, 1150°C and 140 MPa and 1150°C and 80 MPa. The deleterious effect of thermal cycling on the creep behavior and lifetime has been confirmed, particularly for the condition at 1150°C and 80 MPa. Furthermore, the number of low temperature incursions has severe detrimental effect on creep resistance on account of the rafted microstructure destabilization induced by these sequences. These results confirm the role of re-precipitation and dissolution of γ' particles during thermal cycling creep. Thermal cycling infers also on destabilization of subcoating zone in the superalloy but this effect seems to be secondary.

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Section: Creep Test Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Goti¹,

Viguier²,

Crabos³

2012

Superalloys 2012 (Twelfth International Symposium)

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Influence of Ruthenium on Topologically Close Packed Phase Precipitation in Single‐Crystal Ni‐Based Superalloys: Numerical Experiments and Validation

Rettig¹,

Singer²

2012

Superalloys 2012

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The suppression of topologically close-packed phases (TCP) in nickel-based single-crystal superalloys by the addition of ruthenium is modeled with a fully multicomponent mesoscale precipitation model based on the numerical Kampmann-Wagnermethod using thermodynamic CALPHAD-calculations. For the application of the model in ruthenium-containing superalloys, mobility assessments of the binary systems nickel-ruthenium (Ni-Ru) and nickel-rhenium (Ni-Re) were performed to create a new mobility database. It is postulated that the dominating effect of ruthenium regarding more sluggish TCP-phase precipitation is a change of interface energy reducing the number of precipitates nucleating. The precipitation sequences occurring during TCPphase precipitation can be explained using CALPHAD thermodynamics.

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Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non‐Isothermal Creep Behavior of CMSX‐4® Ni‐Based Single Crystal Superalloy

Giraud

Cormier

Hervier³

et al. 2012

Superalloys 2012

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The effect of thermal cycling on the creep behavior and life of the second generation Ni-based single crystal superalloy CMSX-4® has been investigated in the very high temperature/low stress domain. Repeated overheatings at 1100°C and/or at 1150°C were introduced in the course of the creep life of the alloy at 1050°C/120 MPa. The detrimental effect of the thermal cycling compared to the isothermal creep behavior of the alloy is shown: thermal cycling leads to an increased average creep strain rate and a reduced creep life. This is always the case even when compared to the isothermal creep behavior at the highest temperature of the cycle (i.e. 1150°C/120 MPa). Moreover, the detrimental effect of the thermal cycling frequency is observed: the greater frequency the larger the creep properties decay. Compared to the first generation MC2 alloy under the same thermal cycling conditions, CMSX-4® exhibits superior non-isothermal creep properties in the very high temperature domain (T > 1100°C) due to its rhenium and ' contents.The effect of the microstructure degradation (i.e. ' rafting) was also investigated by pre-straining samples at 1050°C under tension (respectively under compression) prior to creep under thermal cycling conditions. These pre-strains allowed to generate a N-type rafting (respectively P-type). N-type ' rafting are shown to be detrimental to the non-isothermal creep properties. In contrast, P-type rafting leads to improved creep properties (i.e. reduced creep strain rate) compared to either N-type rafted or cuboidal ' morphologies. Despite a different behavior, the creep lives are identical for both P-type rafting and the cubical ' precipitates. From the present investigation, it is believed that: 1) P-type rafting improves non-isothermal creep properties due to a reduced dislocation climb activity 2) The transition from stationary creep to tertiary creep is controlled by the kinetics of Ntype rafting.

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Damage accumulation during creep deformation of a single crystal superalloy at 1150°C

Cited by 159 publications

References 23 publications

Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Influence of Ruthenium on Topologically Close Packed Phase Precipitation in Single‐Crystal Ni‐Based Superalloys: Numerical Experiments and Validation

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non‐Isothermal Creep Behavior of CMSX‐4® Ni‐Based Single Crystal Superalloy

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