Microstructural and thermoanalytical characterization of super duplex stainless steel - UNS S32760-F55

Khoshnaw, Fuad; Marinescu, Cornelia; Sofronia, Ancuta; Munteanu, Cornel; Marcu, Mihai; Barbulescu, Laura Eugenia; Ciobota, Cristina Florentina; Cojocaru, Elisabeta Mirela; Tănăsescu, Speranţa; Paraschiv, Alexandru

doi:10.1016/j.mtcomm.2021.102644

Cited by 6 publications

(3 citation statements)

References 30 publications

(33 reference statements)

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“…The second endothermic peak occurred at 1063 °C for the thick powder, 1027 °C medium powder, and 959 °C thin powder, and all these peaks are followed by small crystallization peaks (exothermic peaks). When compared with the literature, [ 29 ] and added to the XRD test, those peaks should correspond to the intermetallic sigma phase and M 7 C 3 carbides. The cooling curves of the second cycle (Figure 7b) showed the same behavior as in the first cycle.…”

Section: Resultsmentioning

confidence: 99%

Characterization of a 2205 Duplex Steel Modified with Boron Obtained via Powder Metallurgy

Morita Terceiro,

Soyama

2023

steel research int.

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Stainless steels are commonly used when a good balance between mechanical properties and corrosion resistance is required. Usually, to increase wear resistance, hard particles are added (carbides, borides, nitrides, and others) to the more ductile matrix (ferrite or austenite). The addition of boron to steels leads to the formation of primary and eutectic borides, which harden the material as solidified. Therefore, herein, the viability to prepare a modified 2205 duplex steel with 2.5 wt% of boron through powder metallurgy is investigated. The boron addition is performed in the atomization step. In addition, the effect of temperature in the sintering process is investigated, as well as the characterization of microstructure formation, phase transformations, and mechanical properties. The specimens are prepared from a prealloyed metal powder with three different granulometries: thick (250–500 μm), medium (106–180 μm), and thin powders (<45 μm). Shaping is conducted by cold uniaxial compaction with sintering in a controlled Ar atmosphere. An optimal sintering temperature of 1200 °C is identified for all granulometries studied. However, the highest densification of >85% is observed with medium powder with an increase of nearly 40% in microhardness in comparison to the reference 2205 steel.

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Section: Resultsmentioning

confidence: 99%

Characterization of a 2205 Duplex Steel Modified with Boron Obtained via Powder Metallurgy

Morita Terceiro,

Soyama

2023

steel research int.

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“…The UNS S32760, which is considered an SDSS, meets these requirements thanks to the mixture of both austenite and ferrite which leads to a material with excellent mechanical properties and corrosion resistance. In addition, it typically contains 25% Cr and 7% Ni-doped with a small amount of N, (0.3%) providing improved corrosion properties, and allowing its use in the marine environment [2]. However, cracks could be generated in welding neck flanges made of SDSS during hot forming and thus, its workability at high temperatures could be limited under certain conditions [3].…”

Section: Introductionmentioning

confidence: 99%

Study of forming defects and failure occurrence in the radial-axial rolling of super duplex stainless steel rings

Murillo-Marrodán

2023

Materials Research Proceedings

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Abstract. Welding neck flanges are commonly manufactured by radial-axial ring rolling (RARR). The service conditions of these elements are very demanding (mechanical loads and corrosive environments). For this reason, materials such as super duplex stainless steel (SDSS) are used, which could present workability problems under certain process conditions. In this work, a study of forming defects and failure occurrence in the RARR of SDSS flanges has been proposed. Firstly, a finite element model of the industrial RARR process was developed and validated. Then, a multivariate factorial analysis based on a virtual design of experiments was performed to identify the determinant parameters of the process. The diameter of the mandrel was identified as the most determinant parameter. An increase in diameter reduces the probability of developing underfilling defects and the development of cracks in the flange neck. The mandrel radial speed has no significant effect on the cracking of underfill defects while reducing the rotational speed of the king-roll could improve the uniformity of the deformation distribution in the flange section.

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“…The welding parameters of ferritic-austenitic steels must be strictly controlled. The cooling rate should be low enough to allow complete transformation of austenite in the high-temperature HAZ area (so that the ferrite grains do not grow too large) and, at the same time, high enough to avoid the formation of precipitates in the low-temperature HAZ area [14,15]. Welding may disturb the proportions of the ferritic and austenitic phases in the joint, even to above 90% ferrite.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Intermetallic Phase Precipitation in Manual Metal Arc Welded Duplex Stainless Steels

Orłowska,

Pańcikiewicz,

Świerczyńska

et al. 2023

Materials

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The article presents the influence of heat treatment on the kinetics of transformations in lean duplex LDX2101 steel and a weld made of standard duplex 2209 material, which was welded by manual metal arc welding. Changes in the microstructure, hardness, and magnetic phase content were analyzed after heat treatment was conducted at a temperature of 800 °C for a period ranging from 15 to 1440 min. Light and scanning microscopy, Vickers hardness measurements, and magnetic phase content measurements using a ferritoscope were used for the research. In the LDX2101 steel, the presence of δ-ferrite and γ austenite was identified and additional Cr2N nitrides were observed in the heat-affected zone. After heat treatment, the decomposition of δ ferrite into γ2 austenite and Cr2N nitrides was observed in both areas. In the case of weld made by the coated electrode in 2209 grade, a ferritic–austenitic microstructure with allotriomorphic austenite (γA), Widmanstätten austenite (γW), and idiomorphic austenite (γI) and δ-ferrite area with “bee swarms” of fine precipitations of chromium nitrides Cr2N and non-metallic inclusions (NMIs) of slag, formed during the welding process, are observed in the as-welded state. After heat treatment, the presence of the χ phase (after 15 min of annealing) and the σ phase (after 120 min of annealing) was additionally identified. The kinetics of intermetallic phase evolution in welds made from 2209 material were presented. The obtained results of hardness measurements and metallographic tests were correlated, which allowed for a quick check of the precipitation processes on the used element.

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Microstructural and thermoanalytical characterization of super duplex stainless steel - UNS S32760-F55

Cited by 6 publications

References 30 publications

Characterization of a 2205 Duplex Steel Modified with Boron Obtained via Powder Metallurgy

Characterization of a 2205 Duplex Steel Modified with Boron Obtained via Powder Metallurgy

Study of forming defects and failure occurrence in the radial-axial rolling of super duplex stainless steel rings

Kinetics of Intermetallic Phase Precipitation in Manual Metal Arc Welded Duplex Stainless Steels

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