Features of Phase Transformations in Martensitic Class Steel for Oil Grade High-Strength Corrosion-Resistant Pipes

Pumpyansky, D. A.; Pyshmintsev, I. Yu.; Bityukov, S. M.; Alieva, E. S.; Gusev, A. A.; Михайлов, С. Б.; Лобанов, М. Л.

doi:10.1007/s11015-022-01270-w

Cited by 3 publications

(1 citation statement)

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“…The specific choice of the alloy depends on the operating conditions and particular requirements of each application. [12][13][14][15] Duplex stainless steels (DSS) generate significant interest in these industrial sectors because their iron-based chemical composition with high contents of chromium and nickel favors the stabilization at room temperature of the microstructure, consisting of roughly equal proportions of austenitic (γ) and ferritic (δ) phases. [16][17][18][19][20] This microstructure provides DSS with a favorable combination of mechanical and anticorrosive properties, ensuring high levels of corrosion resistance at elevated temperatures, as well as optimal toughness and ductility.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen‐Added Shielding Gas on Microstructure Evolution of Welded Joints by Gas Tungsten Arc Welding Process in Duplex Stainless Steel 2205

Rodriguez‐Vargas,

Stornelli,

Miranda Pérez

et al. 2024

steel research int.

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Duplex stainless steels (DSS), due to their high corrosion resistance, primarily attributed to their austenite‐ferrite duplex microstructure, are widely used in industrial sector such as petrolchimical and gas natural industries. Maintaining this microstructure is crucial during manufacturing processes, including welding which presents the challenge of minimizing ferritization in the heat‐affected zone (HAZ) or weld zone (WZ), as it can significantly reduce their corrosion resistance. This work aims to describe the influence of nitrogen gas in the Ar–N2 shielding atmosphere when depositing beads on 2205 DSS plates, using a gas tungsten arc welding (GTAW) process. It is observed that at low nitrogen load (98%Ar–2%N2), the austenite content reaches 49% in WZ and 29% in HAZ. When the nitrogen percentage is increased (50%Ar–50%N2), the austenite content rises to 67% and 37%, respectively. The joint is evaluated macro‐ and microstructurally to observe the atmosphere impact on weld bead geometry and microstructural development. Additionally, hardness is assessed throughout the weld bead. The work demonstrates that, with a 50%Ar–50%N2 shielding gas mixture, it is possible to limit the formation of ferrite in the WZ and HAZ of DSS during the welding process, without altering the microhardness trend of the welded joint.

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