In view of the current results and the previous work, the effect of hydrogen on fatigue crack growth near-threshold appears to depend on several factors. One of the most important is the availability of hydrogen ahead of the growing crack. The apparent absence of enhanced cracking effects in gaseous hydrogen near-threshold may reflect the hydrogen availability as controlled by rate of hydrogen adsorption and the diffusion distance in front of the crack tip. Once hydrogen becomes available at the crack tip through cathodic charging prior to testing or by the increase in the triaxial state of stress at the crack tip, as in the case of the high growth regime, increased susceptibility to cracking appears.
|Original language||English (US)|
|Title of host publication||Perspect in Hydrogen in Met|
|Number of pages||4|
|ISBN (Print)||0080348130, 9780080348131|
|State||Published - Jan 1 1986|