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A Study on Microstructure, Residual Stresses and Stress

May 25, 2020 · AghaAli found that the HAZ of repair specimen is more sensitive to pitting corrosion and the corrosion sensitivity of HAZ was increased with repair number increases. As far as the corrosion resistance is concerned, repair welding can be safely employed as a means of extending the service life of the junction [ 22 ]. Characterization of Corrosion Within Friction Stir Weld Jan 02, 2020 · The susceptibility of API-X70 friction stir weld zones to corrosion in a Na2SO4 acid medium is successfully investigated using an innovative microcell setup. Microstructures were characterized by optical and electron microscopy, Vickers microhardness mapping and linear potential scan voltammetry, at micro- and macroscales.

Corrosion Behavior and Microstructural Characterization of

Mar 30, 2021 · This article aims to describe the corrosion behavior and the FS-Welded joints microstructural features conducted in API X70 steel plates. The corrosion resistance was assessed using potentiodynamic polarization tests at different welding regions, i.e., heat affected zone (HAZ), stir zone (SZ), hard zone (HZ), re-stirred zone (RSZ), and base metal (BM). Corrosion Behavior of Welded Joint of Q690 with CMT TwinJul 04, 2018 · Low alloy steel of Q690 was welded with the method of CMT Twin. The corrosion behavior of welded joint had been investigated using scanning vibrating electrode technique (SVET) in 3.5% NaCl solution. The research results showed that the appearance of the troostite increased the hardness of the heat affected zone. Furthermore, the corrosion products of different microstructure Corrosion behavior of the weld joint of X80 pipeline steel Mar 23, 2020 · Wang L W, Liu Z Y, Cui Z Y, Du C W, Wang X H and Li X G 2014 In situ corrosion characterization of simulated weld heat affected zone on API X80 pipeline steel Corros. Sci. 85 40110. Crossref Google Scholar

Effect of weld heat input on corrosion of dissimilar

Mar 01, 2020 · Effect of weld heat input on microstructural changes and corrosion performance of dissimilar welded API 5L X-42 and grade B pipeline steels is investigated in this section. As explained in the following, results showed that both microstructural changes and electrochemical conditions are responsible for the corrosion of pipeline steels under the simulated coating disbondment. Faysal Fayez Eliyan - Google ScholarCorrosion of simulated weld HAZ of API X-80 pipeline steel. F Mohammadi, FF Eliyan, A Alfantazi. Corrosion Science 63, 323-333, 2012. 115:2012:Corrosion of the Heat-Affected Zones (HAZs) of API-X100 pipeline steel in dilute bicarbonate solutions at 90 CAn electrochemical evaluation. In situ corrosion characterization of simulated weld heat Abstract. Subject to Gleeble processing, microstructures of weld heat affected zone were simulated in X80 steel. Corrosion behavior of the simulated specimen with a microstructure gradient was studied by polarization, local electrochemical impedance spectroscopy and scanning vibrating electrode technique. Microstructure of granular bainite mixed with ferrite (region B) showed the highest charge transfer

Integrity of Pipelines Transporting Hydrocarbons

May 26, 2011 · The Role for Material and Corrosion Engineering in Managing the Service-Life Integrity of Flow and Export Lines.- Protection for Natural Gas Installations Against the Corrosive Effect of Mercury by a Chemical Nickel Coating.- Corrosion Study of API 5L X60 Gas Pipelines Steels in NS 4 Simulated Soil.- Leak Detection:General Remarks and Examples.- Microstructural Analysis and Electrochemical Corrosion are characterized by the welding material, the Heat-Affected Zone, and the base steel. Corrosion of simulated weld HAZ of API X-80 pipeline steel. June 2012 · Corrosion Science. Pitting corrosion in pipeline steel weld zones Semantic Abstract Steel pipelines externally exposed to seawater pit more severely in heat-affected weld zones but longer-term quantitative data are scarce. Maximum pit depths and variability are reported for the longitudinal weld in API X56 Spec 5 L grade steel pipeline samples exposed continuously to natural Pacific Ocean seawater for 3.5 years. For the first year maximum pit depths and pit depth

Stress Corrosion Cracking of Simulated Weld Heat-Affected

The stress corrosion cracking (SCC) of a simulated weld heat-affected zone (HAZ) in X100 pipeline steel in a carbonate/bicarbonate solution was studied at the open-circuit potential (OCP) and Stress corrosion cracking of E690 steel as a welded joint The intercritical heat affected zone in the welded joint was the most vulnerable location to SCC because this zone has less strength, more negative potential, and higher corrosion current density. The M-A constituents had a detrimental effect on SCC behavior in the synergetic effect of stress concentration, micro-galvanic corrosion, and HE. Stress corrosion cracking (SCC) behavior and mechanism of E690 welded joint in simulated Corrosion of the Heat-Affected Zones (HAZs) of API-X100 Abstract This research explores for key correlations between the microstructures of API-X100 steel HAZs, simulated by Gleeble© thermal cycles, and their electrochemical corrosion behavior in dilute bicarbonate solutions at 90 °C. The potentiodynamic polarization revealed the role of ferrite of a HAZ cooled at 10 °C/s with the lowest passive currents, and those of acicular ferrite and