Das Diffusionsverhalten von Wasserstoff in einem niedriglegierten Stahl unter Berücksichtigung des Verformungsgrades

Nonfiction, Science & Nature, Technology, Material Science
Cover of the book Das Diffusionsverhalten von Wasserstoff in einem niedriglegierten Stahl unter Berücksichtigung des Verformungsgrades by Guido Juilfs, GRIN Verlag
View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart
Author: Guido Juilfs ISBN: 9783638130912
Publisher: GRIN Verlag Publication: June 24, 2002
Imprint: GRIN Verlag Language: German
Author: Guido Juilfs
ISBN: 9783638130912
Publisher: GRIN Verlag
Publication: June 24, 2002
Imprint: GRIN Verlag
Language: German

Doktorarbeit / Dissertation aus dem Jahr 2000 im Fachbereich Chemie - Materialchemie, Werkstoffchemie, Note: 1, Technische Universität Hamburg-Harburg (GKSS Forschungszentrum), Sprache: Deutsch, Abstract: The influence of plastic strain on the diffusion behaviour of hydrogen in a low alloyed structural steel (FeE 690T) was investiated using the electrochemical permeation technique. The plastic deformation was introduced either by cold rolling or by tensile straining. It was shown, that the apparent diffusion coefficient depends on the plastic strain and on the overall hydrogen concentration, whereas the maximum hydrogen flux remained almost unchanged. These observations are interpreted in terms of variations in the dislocation density, which act as 'sinks' for the diffusable hydrogen atoms. Together with the results of a previous study on the fracture toughness of FeE 690T in the presence of hydrogen the permeation data obtained in this work suggest that the observed influence of deformation rates on the fracture mechanism can be attributed to the reduced mobility of hydrogen atoms in the plastic zone. The assumption that the hydrogen transport during monotonic straining is controlled by diffusion was confirmed by investigations concerning the formation of surface films. Using a potentiodynamic method (cyclovoltammetry) a characterisation of the surface reactions involved in permeation experiments was performed. It was shown that the nature of the passive layers forming on the surface depens on the applied potential, affecting mainly the hydrogen absorption reaction. The hydrogen entry is assumed to preferably take place at so called 'active sites' on the metal surface.

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

Doktorarbeit / Dissertation aus dem Jahr 2000 im Fachbereich Chemie - Materialchemie, Werkstoffchemie, Note: 1, Technische Universität Hamburg-Harburg (GKSS Forschungszentrum), Sprache: Deutsch, Abstract: The influence of plastic strain on the diffusion behaviour of hydrogen in a low alloyed structural steel (FeE 690T) was investiated using the electrochemical permeation technique. The plastic deformation was introduced either by cold rolling or by tensile straining. It was shown, that the apparent diffusion coefficient depends on the plastic strain and on the overall hydrogen concentration, whereas the maximum hydrogen flux remained almost unchanged. These observations are interpreted in terms of variations in the dislocation density, which act as 'sinks' for the diffusable hydrogen atoms. Together with the results of a previous study on the fracture toughness of FeE 690T in the presence of hydrogen the permeation data obtained in this work suggest that the observed influence of deformation rates on the fracture mechanism can be attributed to the reduced mobility of hydrogen atoms in the plastic zone. The assumption that the hydrogen transport during monotonic straining is controlled by diffusion was confirmed by investigations concerning the formation of surface films. Using a potentiodynamic method (cyclovoltammetry) a characterisation of the surface reactions involved in permeation experiments was performed. It was shown that the nature of the passive layers forming on the surface depens on the applied potential, affecting mainly the hydrogen absorption reaction. The hydrogen entry is assumed to preferably take place at so called 'active sites' on the metal surface.

More books from GRIN Verlag

Cover of the book Das Anselmianische Argument für die Existenz Gottes by Guido Juilfs
Cover of the book Landerziehungsheime - Von der Entstehung zur heutigen Praxis by Guido Juilfs
Cover of the book Der Außenhandel als Kriterium der ökonomischen Leistungsfähigkeit einer Volkswirtschaft by Guido Juilfs
Cover of the book The impact of environmental and climate change on Seasonal Wetlands. The Bugingo Wetland in Mayuge district by Guido Juilfs
Cover of the book Gott gegen Darwin by Guido Juilfs
Cover of the book Würfeln mit 2 Würfeln. Ist jede Augensumme gleich wahrscheinlich? (Klasse 2) by Guido Juilfs
Cover of the book The Historical Development of the Terms 'Colored', 'Negro', 'Black' and 'African-American' by Guido Juilfs
Cover of the book Der 'Ur?b?-Aufstand in Ägypten und seine Ursachen by Guido Juilfs
Cover of the book Performance Measurement- und Anreizsysteme als Instrumente des Beteiligungscontrollings. Möglichkeiten und Grenzen by Guido Juilfs
Cover of the book Fraktalgeometrie: Selbstähnlichkeit und fraktale Dimension - Teil 1 by Guido Juilfs
Cover of the book Wahlplakate 2002: Ein Vergleich von Selbst- und Fremddarstellung by Guido Juilfs
Cover of the book Bilanzierung hybrider Finanzinstrumente nach HGB und IFRS by Guido Juilfs
Cover of the book Das Assessment Center - Anspruch und Wirklichkeit im Spiegel der Validitätsdebatte by Guido Juilfs
Cover of the book Die Chronologie der älteren Merowingerzeit nach H. Ament by Guido Juilfs
Cover of the book Die unterschiedliche Komposition der beiden Dekalogfassungen im Alten Testament by Guido Juilfs
We use our own "cookies" and third party cookies to improve services and to see statistical information. By using this website, you agree to our Privacy Policy