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Start Over Author "Hu, Xiaoyang" Journal materials & design
3 results on '"Hu, Xiaoyang"'

3. Composition design, phase transitions of a new polycrystalline Ni-Cr-Co-W base superalloy and its isothermal oxidation dynamics behaviors at 1300°C

Author

Hu Xiaoyang, Weiwei Xu, Yongtao Zhao, Changrong Li, and Yubi Zhang

Subjects
010302 applied physics, Acicular, Materials science, Scanning electron microscope, Mechanical Engineering, Metallurgy, Analytical chemistry, Oxide, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Isothermal process, chemistry.chemical_compound, Differential scanning calorimetry, chemistry, Mechanics of Materials, Phase (matter), 0103 physical sciences, lcsh:TA401-492, General Materials Science, lcsh:Materials of engineering and construction. Mechanics of materials, Crystallite, 0210 nano-technology, CALPHAD
Abstract

The composition, phase transitions and isothermal oxidation dynamics of a new polycrystalline Ni-Cr-Co-W base superalloy are investigated using CALculation of PHAse Diagrams (CALPHAD), Differential Scanning Calorimetry (DSC), ThermoGravimetric analysis (TG/dTG), Scanning Electron Microscope and Energy Dispersion Spectrum (SEM/EDS) methods. The microstructure of the designed alloy shows a uniform γ matrix with the precipitates of rich-Ti cellular η and rich-Nb acicular platelet δ phase, and no Topologically Close-packed Phases (TCPs) observed, and the oxide behavior obeys a parabolic law with a parabolic constant (kp) 2.945mg2/(cm4·h) at isothermal 1300°C for 30 hours. The oxide scales are composed of an outer loose oxide mixture containing Cr, Ni, Ti and Nb/Ta and generous pores presented for a volatilization of Cr2O3, and a dense aluminum-rich oxide layer. Keywords: Nickel base superalloy, Composition design, Phase transition, Isothermal oxidation dynamics

Published
2017

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