Meso-microstructural computational simulation of the hydrogen permeation test to calculate intergranular, grain boundary and effective diffusivities
| Autor: | Sathiskumar Jothi, S. G. R. Brown, N. Winzer, T.N. Croft |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 2015 |
| Předmět: |
010302 applied physics
Materials science Hydrogen Mechanical Engineering Metals and Alloys chemistry.chemical_element 02 engineering and technology Intergranular corrosion 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences Grain size Crystallography chemistry Mechanics of Materials 0103 physical sciences Materials Chemistry Grain boundary diffusion coefficient Grain boundary Crystallite Composite material 0210 nano-technology Electron backscatter diffraction |
| Zdroj: | Journal of Alloys and Compounds. 645:S247-S251 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2014.12.247 |
| Popis: | Hydrogen induced intergranular embrittlement has been identified as a cause of failure of aerospace components such as combustion chambers made from electrodeposited polycrystalline nickel. Accurate computational analysis of this process requires knowledge of the differential in hydrogen transport in the intergranular and intragranular regions. The effective diffusion coefficient of hydrogen may be measured experimentally, though experimental measurement of the intergranular grain boundary diffusion coefficient of hydrogen requires significant effort. Therefore an approach to calculate the intergranular GB hydrogen diffusivity using finite element analysis was developed. The effective diffusivity of hydrogen in polycrystalline nickel was measured using electrochemical permeation tests. Data from electron backscatter diffraction measurements were used to construct microstructural representative volume elements including details of grain size and shape and volume fraction of grains and grain boundaries. A Python optimization code has been developed for the ABAQUS environment to calculate the unknown grain boundary diffusivity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect