Hydrogen Permeation in X65 Steel under Cyclic Loading
This experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels. Experimental tests were performed to study hydrogen diffusion under applied cyclic loading. The permeation curves were fitted by considering literature models in order to evaluate the ro...
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| Format: | Article |
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MDPI AG
2020-05-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/10/2309 |
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| author | Marina Cabrini Luigi Coppola Sergio Lorenzi Cristian Testa Francesco Carugo Diego Pesenti Bucella Tommaso Pastore |
| author_facet | Marina Cabrini Luigi Coppola Sergio Lorenzi Cristian Testa Francesco Carugo Diego Pesenti Bucella Tommaso Pastore |
| author_sort | Marina Cabrini |
| collection | DOAJ |
| description | This experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels. Experimental tests were performed to study hydrogen diffusion under applied cyclic loading. The permeation curves were fitted by considering literature models in order to evaluate the role of trapping—both reversible and irreversible—on the diffusion mechanism. Under loading conditions, a marked shift to the right of the permeation curves was noticed mainly at values exceeding the tensile yield stress. In the presence of a relevant plastic strain, the curve changes due to the presence of irreversible traps, which efficiently subtract diffusible atomic hydrogen. A significant reduction in the apparent diffusion coefficient and a considerable increase in the number of traps were noticed as the maximum load exceeded the yield strength. Cyclic loading at a tensile stress slightly higher than the yield strength of the material increases the hydrogen entrapment phenomena. The tensile stress causes a marked and instant reduction in the concentration of mobile hydrogen within the metal lattice from 55% of the yield strength, and it increases significantly in the plastic field. |
| first_indexed | 2024-03-10T19:46:28Z |
| format | Article |
| id | doaj.art-34ac4a77b7e048f5991a910dc8926bac |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T19:46:28Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-34ac4a77b7e048f5991a910dc8926bac2023-11-20T00:46:10ZengMDPI AGMaterials1996-19442020-05-011310230910.3390/ma13102309Hydrogen Permeation in X65 Steel under Cyclic LoadingMarina Cabrini0Luigi Coppola1Sergio Lorenzi2Cristian Testa3Francesco Carugo4Diego Pesenti Bucella5Tommaso Pastore6Department of Engineering and Applied Sciences, University of Bergamo, 24129 Bergamo, ItalyDepartment of Engineering and Applied Sciences, University of Bergamo, 24129 Bergamo, ItalyDepartment of Engineering and Applied Sciences, University of Bergamo, 24129 Bergamo, ItalyDepartment of Engineering and Applied Sciences, University of Bergamo, 24129 Bergamo, ItalyDepartment of Engineering and Applied Sciences, University of Bergamo, 24129 Bergamo, ItalyDepartment of Engineering and Applied Sciences, University of Bergamo, 24129 Bergamo, ItalyDepartment of Engineering and Applied Sciences, University of Bergamo, 24129 Bergamo, ItalyThis experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels. Experimental tests were performed to study hydrogen diffusion under applied cyclic loading. The permeation curves were fitted by considering literature models in order to evaluate the role of trapping—both reversible and irreversible—on the diffusion mechanism. Under loading conditions, a marked shift to the right of the permeation curves was noticed mainly at values exceeding the tensile yield stress. In the presence of a relevant plastic strain, the curve changes due to the presence of irreversible traps, which efficiently subtract diffusible atomic hydrogen. A significant reduction in the apparent diffusion coefficient and a considerable increase in the number of traps were noticed as the maximum load exceeded the yield strength. Cyclic loading at a tensile stress slightly higher than the yield strength of the material increases the hydrogen entrapment phenomena. The tensile stress causes a marked and instant reduction in the concentration of mobile hydrogen within the metal lattice from 55% of the yield strength, and it increases significantly in the plastic field.https://www.mdpi.com/1996-1944/13/10/2309low-alloyed steelcathodic protectionhydrogen permeationelasto–plastic deformation |
| spellingShingle | Marina Cabrini Luigi Coppola Sergio Lorenzi Cristian Testa Francesco Carugo Diego Pesenti Bucella Tommaso Pastore Hydrogen Permeation in X65 Steel under Cyclic Loading Materials low-alloyed steel cathodic protection hydrogen permeation elasto–plastic deformation |
| title | Hydrogen Permeation in X65 Steel under Cyclic Loading |
| title_full | Hydrogen Permeation in X65 Steel under Cyclic Loading |
| title_fullStr | Hydrogen Permeation in X65 Steel under Cyclic Loading |
| title_full_unstemmed | Hydrogen Permeation in X65 Steel under Cyclic Loading |
| title_short | Hydrogen Permeation in X65 Steel under Cyclic Loading |
| title_sort | hydrogen permeation in x65 steel under cyclic loading |
| topic | low-alloyed steel cathodic protection hydrogen permeation elasto–plastic deformation |
| url | https://www.mdpi.com/1996-1944/13/10/2309 |
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