Directional Diffusion and Effect Factors of the Elements during Creep of Nickel-Base Single Crystal Superalloys

Su Gui Tian; Ming Gang Wang; Xing Fu Yu; Xu Dong Lu; Ben Jiang Qian

doi:10.4028/www.scientific.net/MSF.638-642.2339

Paper Titles

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Dynamic Recrystallization Modeling during Hot Forging of a Nickel Based Superalloy
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Effect of Thermomechanical Processes on Σ3 Grain Boundary Distribution in a Nickel Base Superalloy
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Directional Diffusion and Effect Factors of the Elements during Creep of Nickel-Base Single Crystal Superalloys
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Phase Transformation Behavior of Boron Containing 9% Cr Heat Resistant Steels
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Heat Treatment and Oxidation Characteristics of Nb-20Mo-15Si-5B-20(Cr,Ti) Alloys from 700 to 1400°C
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Dynamic Recrystallization Behavior of GH4586 Superalloy during Hot Compression
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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Directional Diffusion and Effect Factors of the...

Directional Diffusion and Effect Factors of the Elements during Creep of Nickel-Base Single Crystal Superalloys

Abstract:

By means of the calculation of the elements diffusion mobility, an investigation has been made into the influence of the elements interaction on the rates of the elements diffusion and  phase directional coarsening during creep of single crystal superalloys. Results show that the elements diffusion and  phase directional coarsening during creep are related to the applied stressed and elastic modulus. And the rate of  phase directional coarsening is enhanced with the applied stresses. Due to the interaction between the elements, the rates of the elements diffusion and  phase directional coarsening decrease with the increment of the elements Ta+Mo gross and Ta/W ratio. In the diffusion field of the elements during creep, the Al, Ta atoms with bigger radius are diffused to {100} planes to form the N-type rafted structure along the direction vertical to the applied stress axis, and the change of the strain energy density in the interfaces of the cubic  phase is thougth to be the driving force of the elements diffusion.

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

2339-2344

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.2339

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Online since:

January 2010

Authors:

Su Gui Tian, Ming Gang Wang, Xing Fu Yu, Xu Dong Lu, Ben Jiang Qian

Keywords:

Creep, Diffusion Mobility, Element Interaction, Nickel-Base Single Crystal Superalloy, γ' Phase Directional Coarsening

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