High cycle fatigue behavior of a single crystal superalloy at elevated temperatures

Liu, Y.; Yu, Jinjiang; Xu, Yuchun; Sun, Xiaofeng; Guan, H.R.; Hu, Z. Q.

doi:10.1016/j.msea.2006.11.045

Cited by 58 publications

(21 citation statements)

References 19 publications

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“…An investigation of the high cycle behavior of γ'strengthened single crystal superalloy SRR99 at temperatures of 700 o C, 760 o C, 850 o C, and 900 o C showed that the temperature dependence of the high cycle fatigue life correlated well with the temperature dependence of the static strengths of the alloy [13]. Our observation on the improved fatigue life of Waspaloy when compared to alloy 751 is consistent with the larger high temperature static strength of Waspaloy and the above observations in Nimonic 80A and SRR99.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…The smooth fatigue strength of DD32 alloy at 760 and 900°C are higher than those of SRR99 alloy by 20 MPa. And the notched fatigue strength of DD32 alloy at 760°C is 40 MPa greater than the one of SRR99 alloy [12]. This may be attributed to that the large amount of refractory element such as 4 wt.% Re in DD32 alloy is significantly greater than that of SRR99 alloy, as shown in Table 1.…”

Section: Hcf Behaviormentioning

confidence: 91%

“…Under the same test conditions the ones of SRR99 alloy reported in Ref. [12] are also given in Table 2.…”

Section: Hcf Behaviormentioning

confidence: 98%

“…Complicating matters further is the fact that in many real-world applications, the fatigue strength would be impacted by lots of factors [6][7][8][9][10][11] and fracture mode could be varied with temperature, stress, cyclic frequency [12][13][14] etc. Therefore, it is necessary to research HCF properties of DD32 alloy studied recently by IMR [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Rotary bending high-cycle fatigue behavior of DD32 single crystal superalloy containing rhenium

Yang

Sun

et al. 2012

J Mater Sci

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Smooth and notched specimens of single crystal superalloy DD32 were subjected to rotary bending highcycle fatigue (HCF) loading at different temperatures. The experimental results demonstrate that fatigue strengths of the smooth and notched specimens reach the maxima and the minimum notch sensitivity displays at 760°C. DD32 alloy exhibits excellent HCF properties compared to SRR99 alloy under the same test condition. As for the smooth specimens, slip bands moving through c and c 0 phases as well as dislocation bowing are the main deformation modes. As for the notched specimens, the deformations are carried out by dislocation loop bowing and shearing of PSBs mode at intermediate temperatures; at 900°C, the minimum fatigue strength results from dislocation climbing deformation and the degradation of c 0 precipitates. The fine secondary c 0 precipitates advantage the recovery of dislocations and further deformation of the fatigue specimens.

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“…This high-strength refractory material experiences complex thermomechanical tensioncompression loads [2], fretting and metallurgical failure [3], oxidation and corrosion resistance [4], and vibration during exploitation in high-cycle fatigue (HCF) condition in high-temperature gas environment [5]. The testing of all these properties is complicated at one time and according to this the main test method of such SC Nibased superalloys is the creep testing under tension load with long exposure time at high temperatures [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hard Cyclic Viscoplastic Deformation on Phases Chemical Composition and Micromechanical Properties Evolution in Single Crystal Ni-Based Superalloy

Kommel

2015

Acta Phys. Pol. A

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The phases chemical composition and micromechanical properties in single crystal of Ni-based superalloy with chemical composition of 12.1 Al, 5.3 Cr, 9.4 Co, 0.8 Nb, 0.9 Ta, 0.7 Mo, 2.5 W, 0.7 Re and Ni-balance (in at.%) were changed during hard cyclic viscoplastic deformation at room temperature. The method we used based on the Bauschinger eect. The changes in the dendritic microstructure and chemical composition were characterized by scanning electron microscopy and energy dispersive spectrometry. The phases micromechanical properties evolution were characterized by nanoindentation. The results show that the cumulative strain or strain energy density increase arouse the interdiusion of atoms between the dierent phases and the phases equilibrium in SC was changed. It is established that the interdiusion rate depends on elements atoms activation energy. The new γγ eutectic pools were formed in the primary dendrites region (with ne γ/γ -phase) and as result the length of newly formed dendrites was decreased signicantly. The maximal and plastic depth of nanoindentation were measured and the corresponding micromechanical properties of phases calculated.

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High cycle fatigue behavior of a single crystal superalloy at elevated temperatures

Cited by 58 publications

References 19 publications

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

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

Rotary bending high-cycle fatigue behavior of DD32 single crystal superalloy containing rhenium

Effect of Hard Cyclic Viscoplastic Deformation on Phases Chemical Composition and Micromechanical Properties Evolution in Single Crystal Ni-Based Superalloy

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