Microcracking Dynamic in Hydrogenated Austenitic Steels

Quantitative X-ray phase analysis of surface layers

“…(~') martensite (Holzworth & Louthan, 1968). Diffractograms of the cathodically charged specimen obtained with low-penetrating Cu K~ and high-penetrating Co K0¢ radiations revealed considerable differences in the intensities of the diffraction peaks (Mathias, Katz & Nadiv, 1978). This means that a considerable variation of the phase composition takes place within a thin surface layer of the specimen.…”

Effects of high-pressure hydrogen charging on the structure of austenitic stainless steels

“…Their proposed pseudo-binary phase diagram of the austenite-hydrogen system (referred to both steel compositions) includes a miscibility gap-similar to the palladium-hydrogen [11] and nickel-hydrogen [12] systems. However, Mathias et al [3] and Gavriljuk et al [6] 0921-5093/$ -see front matter © 2004 Elsevier B.V. All rights reserved. doi:10.1016/j.msea.2004.06.017 observed a continuous expansion of the austenite lattice due to hydrogen charging of 304 and 310 stainless steels, without any miscibility gap in the austenite-hydrogen phase diagram.…”

“…In numerous studies, the formation of hcp -martensite in 304-and 310-type austenitic stainless steels was observed as a result of hydrogen charging [3][4][5][6][7][8]. It was also reported that bcc ␣-martensite is formed during the outgassing of hydrogen from 304 stainless steel, whereas no ␣-martensite was detected in 310 stainless steel [7].…”

“…X-ray diffraction studies on cathodically hydrogen-charged austenitic stainless steels have been performed to investigate possible phase transformations due to hydrogen loading [1][2][3][4][5][6][7][8][9][10]. The austenitic stainless steels of AISI type 304 (composition close to Fe/Cr18/Ni10) and AISI type 310 (composition close to Fe/Cr25/Ni20) have been studied most extensively in this context.…”

Phase transitions at the crack tip in titanium-modified type 316 stainless steel cathodically hydrogen charged

“…The relative stability of the austenite 7(fc c)-phase is characterized by its tendency to transform to martensite as a result of strain or subzero cooling. The effect of hydrogen on the 7 austenite stability is that it decreases the 7-phase stability and thus may induce transformation of the 7-phase to e and/or c~'-martensite phases [10][11][12][13][14][15], expanded austenite (7*) and expanded martensite (e*) [8,[16][17][18] or metastable hydrid phases [19,20].…”