caa a22 4500 463224450 CHVBK 20180405153222.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10853-006-0549-y doi (NATIONALLICENCE)springer-10.1007/s10853-006-0549-y Effects of hydrogen on the mechanical properties of a 2 1/4Cr-1Mo steel [Elektronische Daten] [Paula Siquara, Carlos Eckstein, Luiz de Almeida, Dilson dos Santos] This paper explores the effects of hydrogen on the mechanical properties of a 2 1/4Cr-1Mo steel. The results for both microstructural conditions, as received and aged, indicated a loss of ductility after hydrogen charging treatment, but the yield strength and ultimate tensile strength remained unaltered. The fractograph analysis revealed that the fracture mode was modified by the hydrogen. The steel in the as-received condition showed craters and fisheyes on the fracture surface. The aged steel showed a brittle appearance associated with cleavage facets and small portion of areas with dimples. The hydrogen diffusivity and solubility were investigated using electrochemical permeation technique. It was observed that the hydrogen diffusivity decreased from 2.3±0.4×10−10m2s−1 in the as-received condition to 5.7±0.1×10−11m2s−1 in the aged condition. The hydrogen solubility showed an increase for the aged condition in comparison to the as received sample. Both phenomena can be attributed to carbide evolution during aging, resulting in an increase of the carbide/matrix interfacial area. Springer Science+Business Media, LLC, 2007 Siquara Paula PEMM - COPPE/UFRJ, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut Eckstein Carlos CENPES-Petrobras, Cidade Universitária, Rio de Janeiro, RJ, Brazil aut de Almeida Luiz PEMM - COPPE/UFRJ, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut dos Santos Dilson PEMM - COPPE/UFRJ, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2261-2266 0022-2461 42:7<2261 2007 42 10853 https://doi.org/10.1007/s10853-006-0549-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0549-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Siquara Paula PEMM - COPPE/UFRJ, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Eckstein Carlos CENPES-Petrobras, Cidade Universitária, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- de Almeida Luiz PEMM - COPPE/UFRJ, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- dos Santos Dilson PEMM - COPPE/UFRJ, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2261-2266 0022-2461 42:7<2261 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer