Effect of long time service exposure on microstructure and mechanical properties of gas turbine vanes made of IN939 alloy

Jahangiri, M. R.; Abedini, M.

doi:10.1016/j.matdes.2014.08.035

Cited by 55 publications

(15 citation statements)

References 37 publications

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“…1. It is well known [10] that dynamic stresses and temperature are maximal in the convex part of the turbine blade airfoil, at the site termed the suction side (airfoil back). Another place with high stresses is the leading edge of the airfoil.…”

Section: Resultsmentioning

confidence: 99%

“…Under severe deformation, the formation of defects occurs inside the strengthening -phase cuboids. The formation of a stable defect complex inside the '-phase indicates the softening of the intermetallic phase [10]. Planar structural defects may change the atomic positions in the intermetallic crystal lattice and promote a "cluster", a volume structural defect with ferromagnetic ordering [5].…”

Section: Transmission Electron Microscopy Studymentioning

confidence: 99%

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Application of Magnetic Methods to the Study of the Strain State of Nickel-Based Superalloys

Davidov¹,

Stepanova²,

Kazantseva³

et al. 2017

DREAM

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Strain-induced magnetism is observed after severe high-temperature deformation in a gas turbine blade made from nickel-based superalloy. The appearance of ferromagnetic ordering in the initially paramagnetic alloy results from the formation of magnetic clusters inside the cuboids of the strengthening intermetallic phase (Ni 3 Al). The change in the values of magnetic susceptibility correlates with the change in the level of dynamic stresses and the number of stacking fault defects in different parts of the blade.

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Section: Resultsmentioning

confidence: 99%

Section: Transmission Electron Microscopy Studymentioning

confidence: 99%

Application of Magnetic Methods to the Study of the Strain State of Nickel-Based Superalloys

Davidov¹,

Stepanova²,

Kazantseva³

et al. 2017

DREAM

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show abstract

“…The role of carbides has been proved complex, high temperature properties of superalloys can be improved effectively due to the preferred location of carbides at GBs and inhibition of GB sliding [20,21]. However, the continuous M 23 C 6 carbide films formed along the GBs dramatically reduced the stress-rupture life [22,23]. And the plate and strip-like Cr 23 C 6 carbide is found at the large and small transition region GBs (Fig.…”

Section: Schematic Precipitate Behavior Of C 0 and Carbidesmentioning

confidence: 99%

Effect of duplex grain size distributions on long term stress-rupture life at 600 °C/450 MPa of Nimonic 80A

Liu

Wang

et al. 2015

Materials & Design (1980-2015)

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“…They have been widely used in aircraft and power-generation turbines as nozzle guide vanes, blades, rotating parts, etc. [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Development of tool for physical simulation of skin formation during investment casting of nickel-based superalloys

Rahimian

Milenković

Maestro³

et al. 2015

Materials & Design

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Development of investment casting process has been always a challenge for manufacturers of complex shape parts with thin elements. Particularly, misruns often occur in the as-cast complex shape parts due to formation of solid skin by freezing of melt in contact with colder ceramic mould. This work presents a new tool for physical simulation of skin formation during investment casting. Special ceramic tubes are designed and fabricated from the material used for manufacturing of ceramic moulds for investment casting.Melting/solidification experiments are carried out in the thermo-mechanical simulator, where the melt is contained in the ceramic tube, which is heated to the temperature of ceramic mould in investment casting. Detailed microstructural characterization of the solidified specimens is performed; the obtained results predict the thickness of skin and its microstructure. This concept is applied to investment casting of complex shape nozzle guide vanes from the Mar-M247 Ni-based superalloy. Experimental casting trials are performed, and the outcomes of physical simulation tool are validated against experimental results.

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Effect of long time service exposure on microstructure and mechanical properties of gas turbine vanes made of IN939 alloy

Cited by 55 publications

References 37 publications

Application of Magnetic Methods to the Study of the Strain State of Nickel-Based Superalloys

Application of Magnetic Methods to the Study of the Strain State of Nickel-Based Superalloys

Effect of duplex grain size distributions on long term stress-rupture life at 600 °C/450 MPa of Nimonic 80A

Development of tool for physical simulation of skin formation during investment casting of nickel-based superalloys

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