The effects of Ta on the stress rupture properties and microstructural stability of a novel Ni-base superalloy for land-based high temperature applications

Zheng, Liang; Zhang, Guoqing; Lee, Tung Lik; Gorley, Michael; Wang, Yue; Xiao, Chengbo; Li, Zhou

doi:10.1016/j.matdes.2014.04.055

Cited by 84 publications

(17 citation statements)

References 27 publications

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“…However, with higher industrial requirements in the structure materials for high-temperature applications in aviation field, materials capable of better mechanical strength, oxidation and corrosion resistance are required. In order to improve the properties of Ni-based alloys, an excellent alternative is to alloy refractory elements [3][4][5][6]. Technologically, Cr addition could significantly improve the oxidation and hot-corrosion resistance for the nickel-based alloys by forming a stable oxidation protective layer Cr 2 O 3 at elevated temperatures [4,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Isothermal Sections of the Ni-Cr-Ta Ternary System at 1200 °C and 1300 °C

Wang

Liang

Yang

et al. 2019

Metals

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Two isothermal sections of the Ni-Cr-Ta ternary system at 1200 °C and 1300 °C have been determined by using electron probe microanalysis, energy dispersive spectroscopy and differential scanning calorimeter. A Laves phase (Ni, Cr)2Ta(HT)(C14 structure) with large solid solubility stabilized by the Ni addition was determined in both two isothermal sections. The composition range of this phase was about 25.8–66.0 at.% Cr, 2.5-44.3 at.% Ni, and 24.0-40.0 at.% Ta at 1200 °C, which increased with raising temperature. The melting point of the Ni-Cr alloys decreased with the addition of Ta. No ternary compound was found in both these two isothermal sections. The present work could be significant for practical application of nickel-based alloys and future thermodynamics assessment of the Ni-Cr-Ta ternary system.

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Section: Introductionmentioning

confidence: 99%

Isothermal Sections of the Ni-Cr-Ta Ternary System at 1200 °C and 1300 °C

Wang

Liang

Yang

et al. 2019

Metals

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“…Subsequently, the Co-based superalloys have been regarded as one of the promising high-temperature materials that exhibit better high-temperature strength than the conventional Ni-based superalloys [1]. To further improve high-temperature properties of Co-based superalloys, some refractory alloying elements, such as Re, Ta, W, and Mo, have been added to materials, which can improve high-temperature mechanical properties, creep properties, corrosion, and oxidation resistance [2][3][4][5][6][7][8][9][10][11]. Re does not randomly distribute in the alloy; it hinders dislocation movement by forming tiny clusters which act as obstacles during creep tests [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, as Re content increases, it refines the morphology and enhances the content of the alloy compound for Co-based superalloys [6]. Doping of Ta can maintain good microstructural stability and improve oxidation resistance [7,8]. The amount of Re and Ta additions is strictly restricted because excessive additions will cause the brittle and detrimental TCP (topologically close packed) phases to form at high stresses and temperatures [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Phase Equilibria in the Co-Re-Ta Ternary System

Liu

Zhang

et al. 2018

Metals

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In this study, the isothermal sections of the Co-Re-Ta ternary system at 1100, 1200, and 1300 °C have been experimentally investigated by means of electron probe microanalysis and X-ray diffraction. The results indicated the following: (1) The solid solubilities of the λ3, (εCo, Re), χ-Re7Ta3, and bcc-(Ta) phases were large and changed very little from 1100 to 1300 °C; (2) more interestingly, the λ2 phase, with a very limited solubility of Re, was surrounded by the λ3 phase; (3) the solubility of Re for the μ-Co6Ta7 phase increased slowly from 1100 to 1300 °C. These experimental results will be useful for Co-based high-temperature alloys, especially as a supplement for thermodynamic databases.

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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%

“…There is a body of experimental research on skin formation during casting of Al alloys [6,7], Mg alloys [8][9][10] and cast iron [11][12][13], whereas the research on skin formation during investment casting of Ni-based superalloys is surprisingly very limited [14]. The prediction and control of the thickness of skin is considered as a challenge in casting technology [3]. First, in some alloys and casting methods, skin represents lower mechanical properties resulting in need for final surface treatment to remove the skin [10,11].…”

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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The effects of Ta on the stress rupture properties and microstructural stability of a novel Ni-base superalloy for land-based high temperature applications

Cited by 84 publications

References 27 publications

Isothermal Sections of the Ni-Cr-Ta Ternary System at 1200 °C and 1300 °C

Isothermal Sections of the Ni-Cr-Ta Ternary System at 1200 °C and 1300 °C

Experimental Investigation of Phase Equilibria in the Co-Re-Ta Ternary System

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

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