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Hydrogen-induced γ → ɛ transformation and the role of ɛ-martensite in hydrogen embrittlement of austenitic steels

✍ Scribed by S.M. Teus; V.N. Shyvanyuk; V.G. Gavriljuk

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
307 KB
Volume
497
Category
Article
ISSN
0921-5093

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✦ Synopsis

The fraction of hydrogen-induced H martensite and mechanical properties of hydrogen-charged austenitic steels were studied as a function of their chemical composition. It is shown that alloying elements affect the intensity of ␥ → H transformation due to their influence on stacking fault energy. A decisive role of dislocation splitting in the H formation is also confirmed by results obtained on differently oriented single crystals. Due to hydrogen-caused ␥ → transformation, the hydrogen charging changes the relation between the "soft" and "hard" crystallographic orientations of single crystals. It is obtained that, at variance with the generally accepted "pseudo-hydride" concept of hydrogen embrittlement, the hydrogen-induced H martensite increases resistance of austenitic steels to hydrogen-caused brittleness.

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