Hydrogen embrittlement susceptibility of tempered 9%Cr–1%Mo steel
| Autor: | Pierre Laghoutaris, J. Chêne, E. Herms, Loïc Marchetti |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Scanning electron microscope Metallurgy Energy Engineering and Power Technology chemistry.chemical_element Trapping Condensed Matter Physics Cathodic protection Fuel Technology Brittleness chemistry Composite material Current density Hydrogen embrittlement Tensile testing |
| Zdroj: | International Journal of Hydrogen Energy. 36:15880-15887 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2011.08.096 |
| Popis: | The influence of the subsurface hydrogen activity on the hydrogen embrittlement (HE) susceptibility of a tempered 9%Cr–1%Mo ferritic-martensitic steel (T91) has been studied by constant extension rate tests (CERT) performed under cathodic charging during straining at 20 °C. Changes in the hydrogen activity on the surface were obtained by varying the cathodic current density imposed during a tensile test completed to fracture. The broken samples were observed by scanning electron microscopy (SEM). The results show a strong dependence of the extent of the brittle zone with the subsurface hydrogen activity. This effect could be attributed to an enhancement of the apparent diffusion coefficient of hydrogen when increasing H activity. Increasing H activity could enhance both the trapping rate on pre-existing and strain-induced traps and H dragging by moving traps such as dislocations. |
| Databáze: | OpenAIRE |
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