Effect of material characteristics and test variables on thermal fatigue of cast superalloys. A review

Woodford, D. A.; Mowbray, D. F.

doi:10.1016/0025-5416(74)90135-9

Cited by 75 publications

(24 citation statements)

References 3 publications

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“…The microstructure significantly changes under the action of thermal stress generated by alternating temperature during thermal fatigue, which has deleterious effect on the mechanical property. However, the literature on the microstructure evolution of directionally solidified nickel base superalloy during thermal fatigue was almost not reported till now [3][4]. Therefore, the thermal fatigue microstructure changes of DZ951 alloy, which has the advantages of low density, low cost, high incipient melting temperature and better properties of thermal fatigue resistance and oxidation resistance [5], are systemically studied to determine the failure mechanism of thermal fatigue in this paper.…”

Section: Introductionmentioning

confidence: 97%

Microstructural evolution of a directionally solidified nickel-base superalloy during thermal fatigue

Xia

Yang

et al. 2011

Rare Metals

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The transition of γ′ phase and dislocation during thermal fatigue test was investigated. There is γ′ denuded region in two sides and the tip of thermal fatigue crack because of oxidation during thermal fatigue test. γ′ phase coarsens and rafts. The direction of γ′ rafting is perpendicular to the orientation of crystal growth. High density dislocations are found near crack. Single dislocation moves in the matrix apart from crack. A few dislocations shear γ′ phase because of relatively low strength of γ′ phase at high temperature.

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Section: Introductionmentioning

confidence: 97%

Microstructural evolution of a directionally solidified nickel-base superalloy during thermal fatigue

Xia

Yang

et al. 2011

Rare Metals

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“…It is difficult to compare thermal fatigue results by different investigation. Some experiment results [3][4][5][6][7][8][9][10][11][12][13][14][15] show thermal fatigue property of the alloy is greatly affected by different factors such as upper temperature, holding time, specimen shape, notched radius and direction.…”

Section: Introductionmentioning

confidence: 99%

Influence of direction of notch on thermal fatigue property of a directionally solidified nickel base superalloy

Xia

Yang

et al. 2011

Rare Metals

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Thermal fatigue property of a directionally solidified nickel base superalloy at the condition of different notched orientation and upper temperatures was investigated. The results show that cycle numbers of crack initiation decrease, propagation rate of crack increases and resistance of thermal fatigue reduces with the rise of upper temperature. Thermal fatigue property of the specimen with the notched direction vertical to orientation of dendrite growth (DZ319T) is superior to that of the specimen with the notched direction parallel to orientation of dendrite growth (DZ319L). DZ319L alloy initiates thermal fatigue crack by carbide and propagates along the direction of carbide distribution, which resultes in big propagation rate and poor thermal fatigue property. Crack initiation of DZ319T alloy is mainly by oxidized cavity. The join of oxidized cavity makes crack propagate. There are two cracks in DZ319T alloy, which greatly drops the stress concentration near the notch and decreases the propagation rate of crack. DZ319T alloy has excellent thermal fatigue property.

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“…Glenny in the late fifties introduced a fluidized bed technique using tapered disc specimens [l, 21. This technique was also widely used later by other authors using wedge type specimens [3,4]. For a long time this test was mainly used to compare the thermal fatigue resistance of candidate materials for turbine components.…”

Section: Introductionmentioning

confidence: 99%

“…The actual crack initiation and propagation mechanisms under thermal fatigue (TF) cycling are poorly known since metallographic observations are very scarce [3]. Consequently the prediction of thermal fatigue life remains more controversial than that of isothermal low cycle fatigue (LCF) life at high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Fatigue of Mar‐m509 Superalloy—i. The Influence of Specimen Geometry

Rézaï-Aria

François

Rémy

1988

Fatigue Fract Eng Mat Struct

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The thermal fatigue behaviour of a cast cobalt superalloy was investigated. Wedge type specimens were tested on a rig using flame heating. A standard cycle from 200 to 1100°C was used for most tests and the specimen geometry was changed to investigate a broad range of thermal fatigue lives. The maximum temperature was also varied for a single specimen geometry. The thermal fatigue life to create a 1 mm deep crack ranges from a few tens to one thousand cycles. Crack initiation occurs early in life at oxidised interdendritic carbides as in high-temperature, low-cycle fatigue. Precipitation of small chromium-rich carbides was found to occur in the dendrites during thermal fatigue cycling. An identical precipitate distribution could be induced by a two stage thermal treatment as shown by quantitative metallography. The isothermal stress-strain behaviour at high temperature was so shown to be almost insensitive to the microstructure changes induced by thermal fatigue.

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Effect of material characteristics and test variables on thermal fatigue of cast superalloys. A review

Cited by 75 publications

References 3 publications

Microstructural evolution of a directionally solidified nickel-base superalloy during thermal fatigue

Microstructural evolution of a directionally solidified nickel-base superalloy during thermal fatigue

Influence of direction of notch on thermal fatigue property of a directionally solidified nickel base superalloy

Thermal Fatigue of Mar‐m509 Superalloy—i. The Influence of Specimen Geometry

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