High temperature fatigue of nickel-base superalloys – A review with special emphasis on deformation modes and oxidation

Pineau, A.; Antolovich, Stephen D.

doi:10.1016/j.engfailanal.2009.01.010

Cited by 356 publications

(182 citation statements)

References 61 publications

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“…In some cases, creep may actually reduce the effects of environment and be beneficial to the overall life. An example of such an effect is found in the work of Chasaigne [61] and discussed in an interpretive review [1]. In this work, the effects of creep and environment were studied for specimens taken from different sections of an N18 superalloy disc.…”

Section: N:gs Is High Thenmentioning

confidence: 99%

“…These materials provide one of the most striking examples of the way in which properties can be controlled through both compositional adjustment and processing to obtain desired levels of those properties which are critical for a given application. Some representative compositions are given in table 1.…”

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confidence: 99%

“…Next, the effects of temperature are considered and it is at high temperatures where the effects of environment, deformation mode, creep and microstructural stability as well as their complex interactions become important. The paper ends with a discussion of the more realistic yet extremely complex case of thermo-mechanical fatigue (TMF), 1 in which interactions that never occur in isothermal fatigue act in concert to determine the overall life. Table 1.…”

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confidence: 99%

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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: N:gs Is High Thenmentioning

confidence: 99%

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Microstructural aspects of fatigue in Ni-base superalloys

Antolovich

2015

Phil. Trans. R. Soc. A.

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“…With the demand for increased thermal efficiencies in engines, there is a need for materials to withstand higher operating temperatures and pressures while providing satisfactory fatigue life. In addition to bulk microstructural characteristics the role of surface oxides also has to be considered in evaluating the high temperature fatigue life of alloys [4]. The purpose of this study is to evaluate the high temperature very high cycle fatigue life and the role of microstructure on the life of two common Ni-bases superalloys, alloy 751 and Waspaloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on the High Temperature Fatigue Properties of Two Ni-based Superalloys

Bunting¹,

Kenik²,

Bentley³

et al. 2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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There is significant need for Ni-based superalloys in the next generation automotive engine components such as exhaust valves. High temperature, high cycle fatigue life is one of the important properties required for such applications. The focus of this work is to evaluate the effect of microstructure on the high cycle fatigue properties of two Ni-based alloys, alloy 751, an alloy used in these applications at lower temperatures, and Waspaloy. High cycle fatigue lives of the alloys were evaluated using in-situ high temperature fully reversed fatigue tests at 870 o C and a nominal frequency of 30 Hz. Scanning electron microscopy and transmission electron microscopy were used to characterize the microstructure of the alloys. Computational modeling was used to calculate the equilibrium microstructure and microstructural coarsening at 870 o C. Correlation of fatigue properties with microstructure of the alloys shows that for the experimental conditions used in the study, the fatigue life of Waspaloy, which has greater high temperature strength and larger γ' volume fraction, is better than that of alloy 751. IntroductionThere has been a significant interest in recent years in understanding the fatigue performance of materials in the Very High Cycle Fatigue (VHCF) range or Ultrahigh-cycle fatigue range (UHCF) with typical lifetimes greater than 10 7 cycles. In this range of lifetimes, it has been emphasized that fatigue crack initiation becomes much more important than crack propagation [1]. Fatigue failures have been observed at stresses below the conventional high cycle fatigue limit, resulting in significant motivation to understand the microstructural origins of such failures [1,2]. The role of microstructural characteristics on crack initiation in the VHCF regime has been studied in a wide range of materials, including polycrystal and single crystal Ni-based superalloys [1][2][3].Very high cycle fatigue life at high temperatures is an important property for automotive components such as exhaust valves. With the demand for increased thermal efficiencies in engines, there is a need for materials to withstand higher operating temperatures and pressures 559 7th International Symposium on Superalloy 718 and Derivatives Edited by:

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“…Cyclic deformation and the accumulation of fatigue damage in nickel-base superalloys depend on microstructure and deformation modes under testing conditions. 6) Fatigue damage and crack initiation occur primarily due to the accumulation of irreversibly slipping dislocations in nickelbase superalloys with a limited content of metallurgical defects. 7) Most nickel-base superalloys have a complex microstructure, including inhomogeneously distributed precipitates, a distribution of grain size, and varying grain boundary character.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior and Life Prediction Model of a Nickel-Base Superalloy under Different Strain Conditions

et al. 2016

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The fatigue behavior of a nickel-base superalloy was investigated under total strain-controlled mode at high temperature. The fatigue life, cyclic stress response behavior and hysteresis loop of the superalloy were investigated under isothermal low cycle fatigue (LCF) conditions. The superalloy exhibited cyclic hardening and softening behaviors during the process of fatigue loading. The hysteresis loop shifted downwards slightly with the increase of the number of cycles. The fatigue life under different strain amplitudes reflects the interactions of dislocations and £ A precipitates at elevated temperature. Three life prediction models to evaluate the fatigue life of the superalloy were evaluated for the LCF tests. The prediction values obtained by Manson-Coffin relationship agree well with the experimental results. The mechanisms of LCF were revealed through the observation of the microstructures by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The main deformation mechanism of the superalloy is the different interactions between dislocations and £ A precipitates.

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High temperature fatigue of nickel-base superalloys – A review with special emphasis on deformation modes and oxidation

Cited by 356 publications

References 61 publications

Microstructural aspects of fatigue in Ni-base superalloys

Microstructural aspects of fatigue in Ni-base superalloys

Effect of Microstructure on the High Temperature Fatigue Properties of Two Ni-based Superalloys

Fatigue Behavior and Life Prediction Model of a Nickel-Base Superalloy under Different Strain Conditions

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