Low cycle fatigue behavior of René 80 at elevated temperature

Antolovich, Stephen D.; Liu, S.; Baur, Reinhold

doi:10.1007/bf02648545

Cited by 156 publications

(51 citation statements)

References 7 publications

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“…These results contradict those of Ott & Mughrabi [60], who documented the beneficial effects of rafting, and those of Antolovich et al [44] and Tomkins [45], who showed high mean stress during cycling reduced the life. Clearly, some additional work is required to understand the full range of Re effects and provide a mechanistic basis for these differences.…”

Section: It Was Shown Thatcontrasting

confidence: 64%

“…However, it was felt that by including the actual physical processes a model could be developed that not only was more accurate but also could be used for interpolation and also for extrapolation. Based on all of the preceding, and noting that out-of-phase TMF is generally most damaging in Ni-base superalloys, the model refined and extended a previous environmental-based model for LCF in polycrystalline René 80 [44]. The basis of the model is shown in figure 36 [78,80].…”

Section: Environment-fatigue Interactions In Thermo-mechanical Fatiguementioning

confidence: 95%

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Microstructural aspects of fatigue in Ni-base superalloys

Antolovich

2015

Phil. Trans. R. Soc. A.

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Nickel-base superalloys are primarily used as components in jet engines and land-based turbines. While compositionally complex, they are microstructurally simple, consisting of small (50–1000 nm diameter), ordered, coherent Ni 3 (Al,Ti)-type L1 2 or Ni 3 Nb-type DO 22 precipitates (called γ ′ and γ ′′ , respectively) embedded in an FCC substitutional solid solution consisting primarily of Ni and other elements which confer desired properties depending upon the application. The grain size may vary from as small as 2 μm for powder metallurgy alloys used in discs to single crystals the actual size of the component for turbine blades. The fatigue behaviour depends upon the microstructure, deformation mode, environment and cycle time. In many cases, it can be controlled or modified through small changes in composition which may dramatically change the mechanism of damage accumulation and the fatigue life. In this paper, the fundamental microstructural, compositional, environmental and deformation mode factors which affect fatigue behaviour are critically reviewed. Connections are made across a range of studies to provide more insight. Modern approaches are pointed out in which the wealth of available microstructural, deformation and damage information is used for computerized life prediction. The paper ends with a discussion of the very important and highly practical subject of thermo-mechanical fatigue (TMF). It is shown that physics-based modelling leads to significantly improved life prediction. Suggestions are made for moving forward on the critical subject of TMF life prediction in notched components.

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Section: It Was Shown Thatcontrasting

confidence: 64%

Section: Environment-fatigue Interactions In Thermo-mechanical Fatiguementioning

confidence: 95%

Microstructural aspects of fatigue in Ni-base superalloys

Antolovich

2015

Phil. Trans. R. Soc. A.

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“…In a study on a Nb containing Inconel superalloy, the activation energy for oxidation of Ni-based superalloys at high temperatures has been reported to be as high as 255 kJ/mol [14]. However, studies on oxidation of directionally solidified GTD-111 and Rene 80 (both are high Cr (>13wt%), and Nb free) the activation energy for oxide formation has been reported to be as low as 78 kJ/mol and 40 kJ/mol, respectively [51,52]. Clearly the activation energy for oxidation depends on temperature and alloy composition.…”

Section: Dynamic Embrittlement and Oxidationmentioning

confidence: 99%

Thermal activation of fatigue crack growth: Analysing the mechanisms of fatigue crack propagation in superalloys

Starink

Reed

2008

Materials Science and Engineering: A

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A method for deriving apparent activation energies, E app , for fatigue crack growth (FCG) is presented. It is shown how these E app values can be used to analyse the main underlying mechanism causing the progression of the crack. The E app values for fatigue crack growth in air and vacuum, and with and without a dwell are obtained for a range of Ni based superalloys for turbine disc applications. The apparent activation energies range from about zero to about 300kJ/mol. The analysis allows identification of alloys that are prone to FCG through diffusion controlled mechanisms, notably grain boundary oxidation or grain boundary creep, as well as alloys that are nearly immune to FCG by grain boundary oxidation or creep.

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“…The life reduction takes place due to the introduction of the hold period, which is generally thought to be a result of increased plastic strain, mean stress and the time-dependent damage caused by the hold period. On the other hand, the cyclic stress response behavior of nickel-base superalloys under continuous cycling has been reported extensively in the literature [2,[9][10][11][12][13][14][15]. It was concluded that the cyclic stress behavior of nickel-base superalloys is closely related to such factors as the type and initial microstructure of the alloy, testing temperature and strain rate.…”

Section: Introductionmentioning

confidence: 99%

“…Some mechanisms have also been suggested to explain the cyclic hardening and softening phenomena occurring during cyclic deformation. Moreover, many studies on the fatigue crack initiation and propagation behavior of nickel-base superalloys have been performed [6,7,[9][10][11][17][18][19]. It has been demonstr-ated that, at elevated temperatures, the damage was usually caused by fatigue and creep mechanisms, depending on the number of cycles and the duration of the hold period.…”

Section: Introductionmentioning

confidence: 99%

High temperature fatigue behavior of wrought nickel-base superailoy GH4049

Wang

Chen

Tian

et al. 1999

Metals and Materials

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Push-pull total strain-controlled fatigue tests without and with a hold period were carried at elevated temperatures for wrought nickel base superalloy GH4049. The influence of the testing temperature and strain hold period on fatigue behavior was determined. The alloy would exhibit either cyclic strain hardening, softening or stability during cyclic straining. Fatigue life depends strongly on the testing temperature and the introduction of the strain hold period. Observations on fatigue specimens using transmission electron microscopy (TEM) showed that the dislocations were distributed mostly in the "y matrix. It was observed by scanning electron microscopy (SEM) that cracks initiated always in a transgranular mode, but their propagation mode was closely related to the testing temperature. In addition, the fatigue life was predicted by linear damage summation (LDS), strain range partitioning (SRP) and the strain energy partitioning (SEP) method. The results of life prediction indicated that the SRP and SEP methods were in a good agreement as to the measured and predicted life at lower temperatures, while the LDS method showed better predictability at higher temperature as compared to the SRP and SEP methods.

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Low cycle fatigue behavior of René 80 at elevated temperature

Cited by 156 publications

References 7 publications

Microstructural aspects of fatigue in Ni-base superalloys

Microstructural aspects of fatigue in Ni-base superalloys

Thermal activation of fatigue crack growth: Analysing the mechanisms of fatigue crack propagation in superalloys

High temperature fatigue behavior of wrought nickel-base superailoy GH4049

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