Welding Heat Input Influence on UNS S82441 Lean Duplex Stainless Steel Corrosion Resistance Assessed by Scanning Vibrating Electrode Technique (SVET)

Pauli, Evandro Armini de; Cotting, Fernando; Casanova, Jaime; Aoki, Idalina Vieira; Brandi, Sérgio Duarte

doi:10.1007/s11665-018-3721-z

J. of Materi Eng and Perform

2018

DOI: 10.1007/s11665-018-3721-z

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Welding Heat Input Influence on UNS S82441 Lean Duplex Stainless Steel Corrosion Resistance Assessed by Scanning Vibrating Electrode Technique (SVET)

Evandro Armini de Pauli

Fernando Cotting

Jaime Casanova

et al.

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Cited by 2 publications

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Heat-Affected Zone Characterization of X2CrNiN22-2 Lean Duplex Stainless Steel by Metallographic and Electrochemical Techniques

Varbai

2023

J. of Materi Eng and Perform

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This research aimed to investigate the heat-affected zone of lean duplex stainless steel grade X2CrNiN22-2. Different heat-affected zone microstructures and grain morphologies were developed by Gleeble simulations. The governing microstructures were evaluated by metallographic techniques and electrochemical corrosion measurements. It was found that the 1200-800 °C cooling time significantly affects the microstructure, austenite content, and corrosion properties. The average austenite content in the case of 1 s cooling time is 30.7 ± 1%, which increased with the longer cooling times up to 38.6 ± 0.9%. The rapid cooling times resulted in a more ferritic microstructure, which promoted nitride precipitation in the ferrite grains. The nitride precipitations acted as nucleation sites for pitting initiation in 3.5 wt.% NaCl solution. The lowest pitting potential was measured in the case of the most rapidly cooled sample: 573 ± 31 mV, while the balanced, annealed microstructure had much better pitting corrosion resistance, showing a pitting potential of 1308 ± 62 mV vs. the Ag/AgCl (KCl sat.) reference electrode. The results of this research can be used in designing welding parameters for the welding of the X2CrNiN22-2 lean duplex stainless steel. Graphical Abstract

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Heat-Affected Zone Characterization of X2CrNiN22-2 Lean Duplex Stainless Steel by Metallographic and Electrochemical Techniques

Varbai

2023

J. of Materi Eng and Perform

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A Comparison Between Air and In-Service Welding on Oxygen Concentration and Microinclusions in E7018-1 Weld Metal

Souza¹,

Alves²,

Dalpiaz

et al. 2021

Journal of Pressure Vessel Technology

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In the maintenance of in-service pipelines, the use of covered electrodes is usual due to several factors such as the flexibility of welding in hard-to-reach places and its low cost. During in-service welding of pipelines, the line remains in operation, which implies more rigorous temperature gradients that can result in microstructures more susceptible to failure. The objective of this work is to relate the welding current and cooling conditions, commonly used in-service welding, with the oxygen content and the volumetric fraction of microinclusions. In this step, the effect on the oxygen content and the volumetric fraction of microinclusions are analyzed based on experimental results using the technique of factorial experiments. Bead-on-plate samples were welded under two cooling conditions, air and cooling with water, and two nominal welding currents, 86 A and 98 A. The increase in oxygen content was observed with increasing welding current and with the cooling rate. In addition, the more rigorous cooling rate reduced the mean microinclusions size, which can suppress the formation of acicular ferrite and, consequently, reduce the toughness and the ultimate stress limit of weld metal.

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Welding Heat Input Influence on UNS S82441 Lean Duplex Stainless Steel Corrosion Resistance Assessed by Scanning Vibrating Electrode Technique (SVET)

Cited by 2 publications

References 8 publications

Heat-Affected Zone Characterization of X2CrNiN22-2 Lean Duplex Stainless Steel by Metallographic and Electrochemical Techniques

Heat-Affected Zone Characterization of X2CrNiN22-2 Lean Duplex Stainless Steel by Metallographic and Electrochemical Techniques

A Comparison Between Air and In-Service Welding on Oxygen Concentration and Microinclusions in E7018-1 Weld Metal

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