Fatigue oxidation interaction in in 100 superalloy

Réger, Mihály; Rémy, Luc

doi:10.1007/bf02645049

Cited by 47 publications

(19 citation statements)

References 7 publications

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“…It has often been reported that oxygen performed in air at different strain rates and temperatures uptake is enhanced by cyclic plastic deformation. [10][11][12][13][14] Thus, are used to yield information on time-and temperaturemicrohardness profiles were also measured on cross sections dependent processes. It is assumed that the different contriof samples fatigued at high temperatures to yield the thickbutions to fatigue damage can be superimposed in a linear ness of the ␣ case for different plastic strain amplitudes manner, i.e., da/dN is given by (⌬ pl /2).…”

Section: Methodsmentioning

confidence: 99%

Modeling thermomechanical fatigue life of high-temperature titanium alloy IMI 834

Maier

Teteruk

Christ

2000

Metall Mater Trans A

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A microcrack propagation model was developed to predict thermomechanical fatigue (TMF) life of high-temperature titanium alloy IMI 834 from isothermal data. Pure fatigue damage, which is assumed to evolve independent of time, is correlated using the cyclic J integral. For test temperatures exceeding about 600 ЊC, oxygen-induced embrittlement of the material ahead of the advancing crack tip is the dominating environmental effect. To model the contribution of this damage mechanism to fatigue crack growth, extensive use of metallographic measurements was made. Comparisons between stressfree annealed samples and fatigued specimens revealed that oxygen uptake is strongly enhanced by cyclic plastic straining. In fatigue tests with a temperature below about 500 ЊC, the contribution of oxidation was found to be negligible, and the detrimental environmental effect was attributed to the reaction of water vapor with freshly exposed material at the crack tip. Both environmental degradation mechanisms contributed to damage evolution only in out-of-phase TMF tests, and thus, this loading mode is most detrimental. Electron microscopy revealed that cyclic stress-strain response and crack initiation mechanisms are affected by the change from planar dislocation slip to a more wavy type as test temperature is increased. The predictive capabilities of the model are shown to result from the close correlation with the microstructural observations.

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Section: Methodsmentioning

confidence: 99%

Modeling thermomechanical fatigue life of high-temperature titanium alloy IMI 834

Maier

Teteruk

Christ

2000

Metall Mater Trans A

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“…Mechanical deformation was shown to play a significant role in oxidation and corrosion damage for nickel and its alloys [13][14][15][16][17][18]. For instance, Moulin et al [13] studied the influence of external mechanical loading on oxygen diffusion during nickel oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation kinetics curves gained by thermogravimetric analysis indicated that the oxidation rate of pure nickel was accelerated by both tensile and compressive external stress [16]. A study of cast nickel superalloy IN100 showed that matrix oxidation was strongly enhanced by fatigue cycling [17]. Effects of applied tensile stress on the growth kinetics of oxide scales were also studied for Ni-20Cr alloys [2], where the internal oxidation and the oxide layers were shown to be much thicker than that formed without load.…”

Section: Introductionmentioning

confidence: 99%

Oxygen diffusion and crack growth for a nickel-based superalloy under fatigue-oxidation conditions

Karabela

Lin

et al. 2013

Materials Science and Engineering: A

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Advanced microscopy characterisation and numerical modelling have been carried out to investigate oxygen diffusion and crack growth in a nickel-based superalloy under fatigue-oxidation conditions. Penetration of oxygen into the material and the associated internal oxidation, which leads to material embrittlement and failure, have been found from Focused Ion Beam (FIB) examinations. Applied fatigue loading tends to enhance the extent of internal oxidation for temperatures at 750°C and above. Using a submodelling technique, finite element analyses of oxygen penetration at grain level have been carried out to quantify the fatigue-oxidation damage and calibrate the diffusion parameters based on the measurements of maximum depth of internal oxidation. The grain microstructure was considered explicitly in the finite element model, where the grain boundary was taken as the primary path for oxygen diffusion. A sequentially coupled mechanical-diffusion analysis was adopted to account for the effects of deformation on diffusion during fatigue loading, for which the material constitutive behaviour was described by a crystal plasticity model at grain level. Prediction of oxidation-assisted crack growth has also been carried out at elevated temperature from the finite 2 element analyses of oxygen diffusion near a fatigue crack tip. A failure curve for crack growth has been constructed based on the consideration of both oxygen concentration and accumulated inelastic strain near the crack tip. The predictions from the fatigue-oxidation failure curve compared well with the experimental results for triangular and dwell loading waveforms, with significant improvement achieved over those predicted from the viscoplastic model alone.

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“…The oxidation kinetics curves gained by thermogravimetric analysis (TGA) indicate that the oxidation rate of pure nickel was accelerated by both tensile and compressive external stress [28]. A study of cast nickel superalloy IN 100 showed that matrix oxidation was strongly enhanced by fatigue cycling [29].…”

Section: Introductionmentioning

confidence: 99%

Effects of cyclic stress and temperature on oxidation damage of a nickel-based superalloy

Karabela

Tong

et al. 2011

Materials Science and Engineering: A

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Citation: KARABELA, A. ... et al., 2011 AbstractOxidation damage, combined with fatigue, is a concern for nickel-based superalloys utilised as disc rotors in high pressure compressor and turbine of aero-engines. A study has been carried out for a nickel-based alloy RR1000, which includes cyclic experiments at selected temperatures (700°C~800°C) and microscopy examination using Focused Ion Beam (FIB). The results suggest that the major mechanism of oxidation damage consists of the formation of surface oxide scales and internal micro-voids and oxide particles beneath the oxide scales, which become more severe with the increase of temperature. Applying a cyclic stress does not change the nature of oxidation damage but tends to enhance the extent of oxidation damage for temperatures at 750°C and 800°C. The influence of cyclic stress on oxidation damage appears to be insignificant at 700°C, indicating a combined effect of cyclic stress and temperature. Further energy dispersive x-ray (EDX) analyses show the enrichment of Cr and Ti, together with lower Ni and Co levels, in the surface oxide scales, suggesting the formation of brittle Cr 2 O 3 , TiO 2 , NiO and Co 3 O 4 oxides on the specimen surface.Penetration of oxygen into the material and associated internal oxidation, which leads to further 2 material embrittlement and associated failure, are evidenced from both secondary ion imaging and EDX analyses.

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Fatigue oxidation interaction in in 100 superalloy

Cited by 47 publications

References 7 publications

Modeling thermomechanical fatigue life of high-temperature titanium alloy IMI 834

Modeling thermomechanical fatigue life of high-temperature titanium alloy IMI 834

Oxygen diffusion and crack growth for a nickel-based superalloy under fatigue-oxidation conditions

Effects of cyclic stress and temperature on oxidation damage of a nickel-based superalloy

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