On the Implication of Hydrogen on Inter-granular Fracture
| Autor: | C. Savall, P. Laghoutaris, Juan Creus, J. Chene, Frantz Martin, Xavier Feaugas, Abdelali Oudriss, J. Bouhattate |
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| Přispěvatelé: | Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 (LaSIE), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude de la Corrosion Aqueuse (LECA), Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Physico-Chimie (DPC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Hydrogen [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] chemistry.chemical_element 02 engineering and technology Trapping [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] 01 natural sciences nickel hydrogen embrittlement 0103 physical sciences Physics::Atomic Physics ComputingMilieux_MISCELLANEOUS Grain boundary strengthening 010302 applied physics hydrogen mobility Metallurgy General Medicine 021001 nanoscience & nanotechnology Grain size Intergranular fracture Nickel chemistry trapped hydrogen Chemical physics Grain boundary 0210 nano-technology Hydrogen embrittlement grain-boundaries |
| Zdroj: | Procedia Materials Science (Elsevier) Procedia Materials Science (Elsevier), 2014, 3, pp.2030-2034. ⟨10.1016/j.mspro.2014.06.327⟩ Procedia Materials Science (Elsevier), Elsevier, 2014, 3, pp.2030-2034. ⟨10.1016/j.mspro.2014.06.327⟩ |
| ISSN: | 2211-8128 |
| DOI: | 10.1016/j.mspro.2014.06.327⟩ |
| Popis: | The intergranular fracture promoted by hydrogen ingress in the material depends on densities and organizations of defects near grain boundaries. Particularly, we illustrate first the relation between the grain boundary character and the different defects and trapping sites stored, and their consequences on hydrogen transport and segregation. High-angle Random boundaries (R) are considered as a disorganized phase where the hydrogen diffusion is accelerated, while the Special boundaries (Coincident Site Lattice, CSL) constitute a potential zone for hydrogen trapping due to the high density of trapping sites as dislocations and vacancies. The predominance of one phenomenon depends on several parameters, such as the grain size, the probability of grain boundaries connectivity, the grain boundaries energy and the excess of free volume. Additionally, our experiments confirm that hydrogen promotes vacancies formation, probably in grain boundaries. In a second part, we have explored the role of the Random grain boundaries on damage assisted by hydrogen. Tensile strengthening is reduced under hydrogen flux when the fraction of random grain boundaries increases. These results support the idea that hydrogen flux promotes intergranular fracture more than the hydrogen concentration. |
| Databáze: | OpenAIRE |
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