Naslov
EBSD ANALIZA ACIKULARNOG I BAINITNOG FERITA U ZAVARIMA ČELIKA ISO 3183 X80M U OVISNOSTI O UDJELU CO2 U ZAŠTITNOM PLINU PRI MAG ZAVARIVANJU
(EBSD Analysis of accicular and bainite ferrite in ISO 3183 X80M steel dependingof CO2 content in shielding gas in MAG welding)

Autori
Šolić, Sanja ; Godec, Matjaž ; Schauperl, Zdravko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Zbornik radova/Proceedings of the 41st CWS International conference Zavarivanje - Welding 2016 / Bauer, Branko ; Garašić, Ivica - Zagreb : Hrvatsko društvo za tehniku zavarivanja, 2016, 11-19

ISBN
978-953-7518-04-2

Skup
41st CWS International conference Welding - Zavarivanje 2016

Mjesto i datum
Opatija, Hrvatska, 08.06.2016. - 11.06.2016

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
EBSD; acikularni ferit; MAG zavarivanje; udarna žilavost; ISO 3183 X80M
(EBSD; acicular ferrite; MAG welding; impact toughness; ISO 3183 X80M)

Sažetak
EBSD analysis (Electron backscattered diffraction) is technique for the microstructure –crystallography analysis, which is usually employed for phase analysis and the orientation of crystals. With this technique it is possible to identify and index all seven crystallographic systems and it is used for determining the crystal orientation, the phase identification, grain boundaries, morphology etc. In recent years there have been increasing demands for better properties of pipelines steels mainly for higher strength together with better toughness. Those properties can be generally improved by controlling the chemical composition of steel as well as optimizing production parameters, but many studies have shown also a direct connection between the microstructure and mechanical properties which means that it is necessary to optimize the welding parameters in order to achieve with the required strength and toughness which is better the welds of the steel. The microstructure of acicular ferrite in welds proved to be an optimal microstructure with excellent combination of high strength and good toughness. The good combination of properties is the result mainly due to the relatively high density of dislocations and the fine-grained nature of the acicular ferrite structure with high angle grain boundaries. In this paper, the influence of the amount of CO2 in the shielding gas of MAG welding on the acicular ferrite and its morphology, as well as on the formation and the amount of other microstructural phases that formed in the welds was investigated. The results showed that the EBSD analysis is very good tool for the exact characterization of the microstructural phases in welds. Also, optimization of parameters is essential for obtaining the largest possible amount of acicular ferrite in welds which consequently have a direct impact on the increase of the toughness of welds.

Izvorni jezik
Hrvatski

Znanstvena područja
Strojarstvo, Temeljne tehničke znanosti

POVEZANOST RADA