Effects of residual stresses on hydrogen trapping in duplex stainless steels

The results obtained showed significant changes between the domain sizes of hydrogen charged DSS to non-charged DSS; changes were even seen between gas-phase to cathodic hydrogen charged DSS. In addition, hydrogen had a major influence on the magnitude of residual stresses. At high hydrogen fugacity (cathodic), hydrogen significantly decreased the residual stress inside the sample. However, when it was desorbed at room temperature, its effect decreased. At low hydrogen fugacity (gas-phase), however, hydrogen lowered the residual stress even after aging for one month at room temperature, without gaining its initial value. The differences between hydrogen fugacity effect and non-charged DSS on microstrain will be discussed in detail.