Prediction method for creep life of thin-wall specimen with film cooling holes in Ni-based single-crystal superalloy

Zhou, Wen; Ji, Liang; Liu, Chen-Yu; Pei, Haiqing; Wen, Shifeng; Yue, Zhufeng

doi:10.1016/j.ijmecsci.2018.04.018

Cited by 66 publications

(13 citation statements)

References 25 publications

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“…NSCS is the most commonly used material for turbine blades of advanced aero-engines today [1][2][3][4][5][6], and most single crystal turbine blades are produced by casting that entails controlling the growth direction of the principal stress axis [7]. Generally, the direction of the main stress axis is called primary orientation, which has a significant impact on the arm spacing of primary dendrites, creep properties or stress fracture life, etc.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Effect of Secondary Orientation on the Micro Deformation Behavior of Ni-Based Single Crystal Superalloys

Wei

Song

Zhang

et al. 2022

Metals

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In this paper, a supercell modeling of secondary orientation was established using 90 cubic mosaic units made up of γ’ phase embedded in γ matrix, in accordance with an actual structure of Ni-based single crystal superalloys (NSCS). The effects of secondary orientation on the deformation behavior and microstructure evolution of NSCS under uniaxial tensile were studied by a three-dimensional molecular dynamics (MD) simulation. Simulation results showed that secondary orientation had a significant effect on mechanical properties of NSCS, that is, a big fluctuation was found in tensile strength which dropped down almost 50% from a peak (corresponding to the secondary orientations of 18° and 45°) to a trough (those of 34° and 63°). Mechanisms of secondary orientation affecting the deformation behavior were further discussed systematically. The deformation of NSCS under uniaxial tensile was a process tending towards amorphization of microstructure, together with the dislocation formation, merging and break-up. On a micro viewpoint, this work for us will be useful to apprehend the tensile deformation conduct of NSCS.

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Section: Introductionmentioning

confidence: 99%

Modeling of the Effect of Secondary Orientation on the Micro Deformation Behavior of Ni-Based Single Crystal Superalloys

Wei

Song

Zhang

et al. 2022

Metals

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“…The increase of inlet temperature of turbine engine will inevitably lead to a sharp increase of heat load on the hot end parts. Film cooling has been widely used in turbine blades because of its inherent high efficiency cooling characteristics, and has become one of the main cooling measures for high temperature components of aero-gas turbine engines [1][2][3]. Coolant flow is introduced from the hole on the cooling wall to the primary stream.…”

Section: Introductionmentioning

confidence: 99%

The experimental study of converging slot-holes (consoles) with different transition surfaces

Huang¹,

Wang²,

Peng³

et al. 2022

J. Phys.: Conf. Ser.

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In order to study the effect of consoles with different transition surfaces on film cooling performance, four kinds of consoles with different transition surfaces were designed. Under the same boundary conditions, a series of experimental studies were carried out under two typical blowing ratios. The experimental results show that whether under M=0.5 or M=1.5, compared with the reference case, the console with anti-S-shaped transition surface has the best spatially-averaged adiabatic film cooling effectiveness (ηad,av ), and the ηad,av is improved by 7.6% and 6.6% respectively. Meanwhile, the discharge coefficient (Cd ) is decreased by 2.6% and 2.2% respectively.

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“…In the context of aviation manufacturing, a large number of microscopic cooling holes are present in films on the surfaces of the turbine blades of aero-engines [1][2][3], and these micro-holes are distributed on the blades at different angles [4][5][6]. Such a structure can be used to form a film of cooling gas on the surface of the blade to ensure its reliable operation in the ultra-high-temperature environment of the combustion chamber [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of high-speed EDM and ECM combined process by using a helical tube electrode with matched internal and external flushing

Zhang

Wang

et al. 2021

Int J Adv Manuf Technol

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Micro-hole fabrication at a high speed and accuracy of machining while maintaining high surface quality is challenging. A core difficulty is the removal of the products of machining from extremely narrow gaps. To solve this problem, this study proposes an approach that combines high-speed electrical discharge machining (EDM) with electrochemical machining (ECM) by using a helical tube electrode with matched internal and external flushing. During high-speed electrical discharge drilling, matching the internal flushing with the clockwise rotation of the helical electrode can help remove debris from the bottom of the blind hole. During ECM, matching the external flushing with the anticlockwise rotation of the helical electrode can improve the flow of electrolyte in the gap. First, the flow field was simulated to show that matching the internal and external flushing of the helical electrode can enhance the flow of the medium and reduce particle concentration in extremely narrow gaps. Second, a series of experiments were conducted to verify that the taper of the hole and the surface quality of its wall can be improved by using the helical tube electrode. Finally, an experiment was carried out to optimize the machining parameters, and yielded a minimum taper of 0.008 at a speed of rotation of 460 rpm, and pressures of internal and external flushing of 9 MPa and 4 MPa, respectively.

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Prediction method for creep life of thin-wall specimen with film cooling holes in Ni-based single-crystal superalloy

Cited by 66 publications

References 25 publications

Modeling of the Effect of Secondary Orientation on the Micro Deformation Behavior of Ni-Based Single Crystal Superalloys

Modeling of the Effect of Secondary Orientation on the Micro Deformation Behavior of Ni-Based Single Crystal Superalloys

The experimental study of converging slot-holes (consoles) with different transition surfaces

Performance improvement of high-speed EDM and ECM combined process by using a helical tube electrode with matched internal and external flushing

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