ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The presence of hydrogen in steel decreases its toughness and formability leading tohydrogen embrittlement. To understand the failure mechanisms of steel due to the presence ofhydrogen, a profound insight in the hydrogen household of the steel is needed. This includes a studyof the solubility, the diffusion and the trapping of hydrogen. Next, the absorption and desorptionbehavior during and after electrolytic charging must be well determined. This was investigated inthis research for steels with various types of traps, e.g. dislocations, microcracks, grain boundariesand precipitates such as TiC and Ti4C2S2. The samples were cathodically charged at three differentcurrent densities: 0.8mA/cm2; 8.3mA/cm2 and 62.5mA/cm2. It was noticed that the cathodic currentdensity used for hydrogen loading had a great influence on the results. Observation of the samplesby scanning electron microscopy (SEM) showed that at the highest current density major damage ofthe surface had occurred. Hence it was decided to study more systematically the influence ofcharging current density on the resulting surface aspect and on hydrogen absorption and desorption.The hydrogen charging kinetics, maximum hydrogen solubility and hydrogen desorption behaviorhave also been evaluated for the different current densities during charging
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.816.pdf
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