A study was made of H-induced defects in this stainless steel by measuring the variable energy Doppler-broadening energy spectra of positron annihilation. The defect profiles of the S-parameter, from Doppler-broadening energy spectra, were analyzed as a function of positron incident energies of up to 30keV (about 1μm deep). The results showed that the H damage exhibited significant variations with depth, between surface and bulk, and depended strongly upon the H-charging conditions (current density, charging time). It was suggested that an increase in the S-parameter near to the surface, after H-charging, arose mainly from the formation of H damage (voids). The increase in the S-parameter in the bulk, after H charging, arose mainly from the production of structural defects (dislocations). The defect densities (such as the dislocation density in the bulk), which were introduced by H charging, were estimated in some cases on the basis of a simple trapping model.

Hydrogen-Induced Defects of AISI316 Stainless Steel Studied by Variable Energy Doppler Broadening Energy Spectra. Y.C.Wu, Y.C.Jean: Physica Status Solidi A, 2004, 201[5], 917-22