Naslov
Hydrogen diffusivity in TRIP steel sheet

Autori
Malina, Jadranka ; Begić Hadžipašić, Anita ; Malina, Marijan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
EUROMAT 2011-Abstracts, Montpellier, France / - , 2011

Skup
European Congress on Advanced Materials and Processes

Mjesto i datum
Montpellier, Francuska, 12.09.2011. - 15.09.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
TRIP steel; diffusible hydrogen; permeation; microstructure

Sažetak
High strength low alloyed structural steels exposed to different service conditions often are in contact with aggressive working media. In corrosive electrolytes, Fe-dissolution is accompanied by the evolution of hydrogen which enters the crystal lattice and became the main cause of hydrogen embrittlement, known as one of the most dangerous manifestation of stress corrosion cracking. This phenomenon is particularly dangerous in high strength low alloyed steels as H-atoms enter the crystal lattice and reduce the cohesive strength of metal. The weakened construction undergoes the sudden failure under the stresses fairly lower than those predicted by calculations. With the aim to understand the interaction between hydrogen and microstructure of novel multiphase TRIP steels characterized by transformation induced plasticity, in this study the diffusion properties of H-atoms deliberated during steel corrosion in sulphuric acid solution have been investigated.Experiments were performed by electrochemical permeation technique in a two- compartment cell with the TRIP steel membrane between the ingress cell where H-atoms enter the steel and exit cell in which diffusible hydrogen is going out. At this side of a membrane H-atoms permeated through the steel are converted into H+- ions (potentiostatic control), giving the characteristic flux transients, J = f (t).Results have shown that multiphase microstructure of TRIP steel is the main factor influencing H- permeability shown in the figure, and can be related to diffusion characteristics (diffusion coefficient D, stationary flux Jss, subsurface concentration C0) calculated from permeation curves.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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