Almtract--Plastic deformation of ferritic stainless steel alloy AL 29-4-2 has been found to severely decrease the diffusivity and permeation of hydrogen and to increase the solubility somewhat. These changes are compared to the effects of deformation on these quantities in austenitic alloys. The dif
The effect of plastic deformation on the diffusion of hydrogen in nickel
โ Scribed by H.H Grimes
- Publisher
- Elsevier Science
- Year
- 1959
- Weight
- 560 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0001-6160
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โฆ Synopsis
The diffusion of hydrogen in elastically and plastically strained nickel has been measured by a permeability experiment with the result that no significant change of the diffusion coefficient was observed for deformations up to 10 per cent. These results are in agreement with a recent theoretical analysis of interstitial diffusion in strained systems based upon considerations of interatomic forces and strain gradients.
The diffusion coefficient calculated for hydrogen through unstrained nickel can be represented by the equation: D = 0.0095 exp (-10,30O/RT) cme/sec in the temperature interval 430"~850ยฐC. L'EFFET DE LA DEFORMATION PLASTIQUE SUR LA DIFFUSION DE L'HYDROGENE DANS LE NICKEL L'auteur a mesure, par des essais de permeabilite, la diffusion de l'hydrogene dans le nickel deform6 elastiquement et plastiquement. 11 n'a pas obtenu une modification appreciable du coefficient de diffusion pour des deformations allant jusqu'a 10 pour cent. Ces resultats sont en accord avec une analyse theorique recente de la diffusion interstitielle dans les systemes deform&s qui s'appuie sur des considerations de forces inter-atomiques et de gradients de deformations. Le coefficient de diffusion calcule pour l'hydrogene dans le nickel non deform& peut Btre represent6 par l'equation: D = 0,0095 exp (-10,30O/R!Z') cmz/sec pour un intervalle de temperature de 430 it 850ยฐC. DER EINFLUSS PLASTISCHER VERFORMUNG AUF DIE DIFFUSION VON WASSERSTOFF IN NICKEL Durch Messung der Durchlassigkeit wurde die Diffusion van Wasserstoff in elastisch und plastisch verformtem Nickel untersucht. Fiir Deformationen bis 10 Prozent ergab sich keine wesentliche Anderung des Diffusions-Koeffizienten. Das stimmt iiberein mit einer ktirzlich gemachten theoretischen Untersuchung der Zwischengitter-Diffusion in verformten Systemen, die sich auf Betrachtungen der zwischenatomaren Kriifte und des Gradienten der Verzerrung sttitzt. Der Diffusions-Koeffizient fur Wasserstoff in unverformtem Nickel liisst sich im Temperaturgebiet 430"-850" C darstellen durch: D = 0,0095 exp ( -10300/RT)cm2/sec.
๐ SIMILAR VOLUMES
tion of the alloyed hydrogen. ## Pennsylvania. Previous determinations of hydrogen diffusion rates
Slow strain-rate tensile tests have been performed on hydrogen-charged f.c.c. nickel-iron alloys. The hydrogen embrittlement observed in pure nickel is suppressed by alloying with iron so that the deformation and fracture behaviour of alloys containing 50 and 60 % o f of hydrogen at levels in the or
Hydrogen charged nickel was deformed in tension at a test temperature of 208 K to study the diffusive segregation of hydrogen during straining and the dependence of embrittlement on grain boundary hydrogen concentration and deformation rate. Tests were performed on samples in the as-quenched conditi