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José de San Martín, Argentina

Hurtado Norena C.,Institute Tecnologia Jorge Sabato | Bruzzoni P.,Comision Nacional de la Energia Atomica
Materials Science and Engineering A | Year: 2010

The influence of the microstructure on hydrogen diffusion and trapping has been studied for a modified 9%Cr-1%Mo ferritic-martensitic steel (P91) in five different metallurgical conditions ranging from as quenched martensite to annealed ferrite. The material in these different conditions has been characterized and subjected to hydrogen permeation tests. The results show a strong dependence of hydrogen trapping on the metallurgical condition and this behavior may be related to the different density and nature of carbide particles. The role of dislocations on hydrogen trapping seems to be of secondary importance in this kind of materials. © 2009 Elsevier B.V. All rights reserved. Source

Castano Rivera P.,Institute Tecnologia Jorge Sabato | Ramunni V.P.,CONICET | Bruzzoni P.,Comision Nacional de la Energia Atomica
Corrosion Science | Year: 2012

Electrochemical hydrogen permeation tests were performed on an API 5L X60 steel to study trapping and diffusion properties in the as-received (AR) and in a cold-rolled (CR) state, at 30, 50 and 70°C. Hydrogen trapping was characterized by assuming saturable traps in local equilibrium. Binding energies (ΔG) and trap densities (N) were determined by fitting a trapping theoretical model to experimental data. Both conditions AR and CR present a high density of weak traps |ΔG|<35kJ/mol, namely N=1.4×10-5 and 7.9×10-4mol/cm3 respectively. Strong trapping sites were detected (-72<ΔG<-57kJ/mol) and their densities increased markedly after cold-rolling. © 2011 Elsevier Ltd. Source

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