Hydrogen trapping mechanism of different duplex stainless steels alloys

Evaluation of hydrogen trapping mechanisms during performance of different hydrogen fugacity in a lean duplex stainless steel

“…Additional reflection observed was ascribed to the ε H -martensite, a hydrogen-containing hcp solid solution, which appears as a result of the combination between hydrogen induced in the g phase and plastic deformation [3,22e25]. These observations were already seen in cathodic charged DSS alloys [3,11,25,26]. A similar result is also seen in hydrogen cathodic charged Ti based alloys, where hydrogen increases the lattice parameter and can lead to second phase's precipitation [27].…”

Tensile Properties of an Electrolytically Hydrogen Charged Duplex Stainless Steel Affected by Strain Rate

“…1) On the other hand, their low resistance to hydrogen embrittlement (HE) is one of the main problems in maximizing the service life of DSSs in industry. [2][3][4] It is believed that for duplex stainless steels, embrittlement involves a combination of mechanisms of mainly HEDE (Hydrogen Enhanced Decohesion) in ferrite and mainly HELP (Hydrogen Enhanced Local Plasticity) in the austenitic phase. 5,6) When the susceptibility of metallic materials to HE is phenomenologically studied, usually tensile tests are carried out for the specimens pre-charged with hydrogen and/ or in the hydrogen charging environment, and the degree of degradation in ductility (tensile strength in very severe case) [7][8][9][10] is investigated with fractographic analysis and/or crack path analysis.…”

Hydrogen Distribution in a Duplex Stainless Steel Investigated by Means of Hydrogen Microprint Technique

“…[18][19][20] The hydrogen atoms in steels have been roughly divided into two categories: one is non-diffusive hydrogen atom strongly trapped by stable trapping sites such as precipitates and inclusions, and the other is diffusive hydrogen atom that are in the interstitial site of the matrix or lightly trapped by less stable sites such as dislocations and grain boundaries. [21][22][23][24][25] The most important issue is the behaviour of diffusive hydrogen in the microstructure that affects the failure: whether it is in the interstitial lattice site or lightly trapped by some lattice defects, and where the diffusion path is. Acquiring such information is extremely difficult by common analysing technique such as scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDXS), since hydrogen is small in quantity and its X-ray cannot be detected.…”