Microstructure, Corrosion Resistance, and Hardness of Simulated Heat-Affected Zone of Duplex UNS S32205 and Superduplex UNS S32750 Stainless Steels

Pecly, P. H. R.; Almeida, Brígida Bastos de; Pérez, Gerónimo; Pimenta, Alexandre Dias; Tavares, Sérgio Souto Maior

doi:10.1007/s11665-022-07784-3

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…The GBA and the WA were the predominant austenite phase forms in the analysed joint both on the face and fusion side ( Figure 4 ). Similar observations of the microstructure of weld metal and HAZ were reported by other researchers [ 3 , 5 , 11 , 15 ]. The GBA nucleates and grows at the ferrite–ferrite boundary as energy-privileged sites.…”

Section: Research Results and Analysissupporting

confidence: 90%

“…The austenite and ferrite grains were elongated in the rolling direction of plastic deformation. The microstructure of the test material was typical of this steel grade [ 4 , 11 , 14 ]. The volume percentage of ferrite in the base material was approx.…”

Section: Research Results and Analysismentioning

confidence: 99%

“…The volume percentage of the austenite formed depends on the chemical composition of the steel, the cooling rate after heat treatment and/or welding process and the diffusion rate of diffusing elements. The increase in the cooling rate in the weld zone and HAZ can lead to a higher content of metastable ferrite due to inadequate time for transformation of ferrite phase to austenite phase [ 11 , 16 , 19 ]. Numerous austenite particles in the form of the WA ( Figure 5 ) also indicates a high cooling rate in these areas of the weld.…”

Section: Research Results and Analysismentioning

confidence: 99%

“…The similar high TS values for duplex steel welded joints were observed in, but not limited to, Refs. [ 5 , 11 , 15 ]. Metastable ferrite in duplex steels is responsible for strength properties; hence, its higher content will result in an increase in these properties.…”

Section: Research Results and Analysismentioning

confidence: 99%

“…The increase in the proportion of ferrite in these areas can lead to deterioration of the plastic properties and decrease in the corrosion resistance of the welded joint. On the other hand, welding made with too high heat input can contribute to the precipitation and growth of unfavourable hard and brittle phases due to the extension of the HAZ residence time at above 280 °C [ 7 , 8 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties and Microstructure of Austenite—Ferrite Duplex Stainless Steel Hybrid (Laser + GMAW) and SAW Welded Joint

et al. 2023

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The purpose of the research was to develop a technology for producing thick-walled duplex steel welded joints. The material used in the research was X2CrNiMoN22 duplex steel in the form of a 15 mm thick plate. The welded joint was produced by the modern, high-performance Hybrid Laser Arc Welding (HLAW) method. The HLAW method involves welding a joint using a laser, the Gas Metal Arc Welding (GMAW) method and the Submerged Arc Welding (SAW) method. The HLAW method was used to make the root pass of the double butt welded joint, while the filler passes were made by the SAW method. The obtained welded joint was subjected to non-destructive and destructive testing. The non-destructive and macroscopic tests allowed the joint to be classified to the quality level B. Microscopic examinations revealed the presence of ferritic–austenitic microstructure in the base material and the weld, with different ferrite content in specific joint areas. The analysed joint had high strength properties (tensile strength (TS) ~ 790 ± 7 MPa) and high ductility of weld metal (~160 ± 4 J) heat-affected zone (~216 ± 26 J), and plasticity (bending angle of 180° with no macrocracks). At the same time, hardness on the cross-section of the welded joint did not exceed 280 HV10.

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