EBSD analiza acikularnog i bainitnog ferita u zavarima čelika iso 3183 x80m u ovisnosti o udjelu co2 u zaštitnom plinu pri mag zavarivanju

Šolić, Sanja and Godec, Matjaž and Schauperl, Zdravko (2016) 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. In: 41st CWS International conference Welding - Zavarivanje 2016, Opatija, Hrvatska.

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Official URL: https://www.bib.irb.hr/835581

Abstract (Croatian)

Posljednjih godina sve su veći zahtjevi za što boljim svojstvima čelika za cjevovode od kojih su najznačajnija visoka čvrstoća i što bolja žilavost. Sa stajališta tih zahtjeva, kritična mjesta na cjevovodima su svakako zavari, te su mnoga istraživanja usmjerena na optimiranje parametara zavarivanja a time i mikrostrukture tih čelika. Mikrostruktura acikularnog ferita u zavarima čelika za cjevovode pokazala se kao optimalna s izvrsnom kombinacijom visoke čvrstoće i dobre žilavosti. Ta dobra kombinacija svojstava proizlazi iz kombinacije relativno visoke gustoće dislokacija i vrlo sitnih zrna tj iglica acikularnog ferita koje karakteriziraju velikokutne granice. U ovom radu istražen je utjecaj udjela CO2 u Ar pri MAG zavarivanju čelika ISO 3183 X80, na formiranje acikularnog ferita i njegovu morfologiju, te na formiranje i udio ostalih mikrostrukturnih faza koje su se pojavile u zavarima. U analizi strukture korištena je EBSD metoda (eng. electron backscattered diffraction), te je dokazano da se različitim udjelima CO2 u zaštitnom plinu značajno može utjecati na količinu acikularnog ferita.

Abstract

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.

Item Type: Conference or Workshop Item (Other)
Uncontrolled Keywords: EBSD, acikularni ferit, MAG zavarivanje, udarna žilavost, ISO 3183 X80M
Keywords (Croatian): EBSD, acicular ferrite, MAG welding, impact toughness, ISO 3183 X80M
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
TECHNICAL SCIENCE > Basic technical sciences
Divisions: 1000 Department of Materials > 1010 Chair of Materials and Tribology
200 Department of Engineering Mechanics
Date Deposited: 21 Sep 2016 08:18
Last Modified: 21 Feb 2018 14:47
URI: http://repozitorij.fsb.hr/id/eprint/6605

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