Naslov
Permeation Properties of Hydrogen Entrapped in TRIP steel

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

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

Izvornik
The 59th Annual Meeting of the International Society of Electrochemistry - Abstracts, Sevilla, Spain, 2008. / - , 2008

Skup
The 59th Annual Meeting of the International Society of Electrochemistry

Mjesto i datum
Sevilla, Španjolska, 07.09.2008. - 12.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
TRIP steel; hydrogen diffusion; microstructure; hydrogen embrittlement

Sažetak
Corrosion of steel in acid solutions results not only in the Fe-ion release, but also in evolution of atomic hydrogen which enters the crystall lattice and could affect the mechanical reliability of metal construction. The microstructure of steel „ responds“ to absorbed hydrogen in a way that H-atoms and molecules are captured in different traps. Once being captured, hydrogen weakens the cohesive strength between the microconstituents and strongly diminishes ductility of metal. Therefore, in this study the permeation properties of hydrogen were investigated in steels known to have excellent strength-ductility combinations due to TRIP (transformation induced plasticity) effect. The enhanced ductility of TRIP steels is ascribed to the presence of retained austenite that transforms into martenzite during plastic straining. Diffusion properties of absorbed H were investigated by electrochemical permeation technique in a two-compartment cell with steel membrane between cathodic H-entry side (2M H2SO4) and anodic H-exit side (1M NaOH). Experiments have shown that charging with hydrogen gave characteristic transient behaviour depending on microstructural characteristics. From the number of hydrogen permeability-time curves, diffusion coefficient was determined by the tlag method. An average D-value obtained (3.0x 10-7 cm-2/s) is smaller than usually observed by other conventional steels of the same strength level. Permeation current density and diffusivity obtained are interpreted based on the trapping theory so as to reveal the infuence of microstructure on hydrogen uptake in TRIP steel.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

POVEZANOST RADA