Characteristics of Flakes Stacked Cr2N with Many Domains in Super Duplex Stainless Steel

Lin, P.C.; Tsai, Yu-Ting; Gan, Neng-Hao; Yang, Jue; Wang, Shing-Hoa; Chang, Horng‐Yi; Lin, Tzy‐Rong; Chiu, Po-Kai

doi:10.3390/cryst10110965

Cited by 3 publications

(1 citation statement)

References 27 publications

(33 reference statements)

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“…According to the literature, to have an industrial application, an austenite volume fraction higher than 25% is mandatory [7][8][9]. Another problem related to SDSS welding is that due to the large amount of alloying element, depending on the welding parameters, carbides, nitrides, and others detrimental secondary phases can precipitate in the temperature range between 700 and 950 • C. Even a small amount of sigma phase is enough to cause a huge reduction in ductility and corrosion resistance of SDSS [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Correction of Phase Balance on Nd:YAG Pulsed Laser Welded UNS S32750 Using Cobalt Electroplating Technique

et al. 2023

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Super-duplex stainless steel (SDSS) shows high mechanical and corrosion resistance because of the balanced structure of austenite and ferrite. However, maintaining this phase ratio after welding is a challenge. The use of austenite stabilizing components is recommended to balance the microstructure. The addition of alloying elements presents a challenge because of the characteristics of Nd:YAG pulsed laser welding. An approach, which has proven to be effective, is to use metal electroplating to prepare the surfaces of the mechanical SDSS components that will be welded, therefore promoting the phase balance in the fusion zone. While the effects of metals such as nickel as an austenite stabilizer are well recognized, cobalt’s effects require more research. The present work investigated the influence of the use of cobalt addition in the joining process by preliminary electroplating on UNS S32750 SDSS Nd: YAG pulsed laser welding, specifically regarding microstructure and microhardness. Three conditions were investigated, changing the thickness of the deposited cobalt layer. The addition of cobalt modified the morphology and increased the volume fraction of austenite. An austenite volume fraction of around 48% was obtained using a 35 μm thick cobalt coating. The microhardness was affected by austenite/ferrite proportions. The microhardness dropped from about 375 HV to 345 HV as the cobalt layer’s thickness rose, being similar to that of the base metal. The effect of cobalt as an austenite stabilizer was observed, and the cobalt electroplating technique was effective to correct the phase balance on UNS S32750 laser welding.

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Section: Introductionmentioning

confidence: 99%

Correction of Phase Balance on Nd:YAG Pulsed Laser Welded UNS S32750 Using Cobalt Electroplating Technique

et al. 2023

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Investigation of Selective Laser Melting of 2205 steel precipitates and heat treatment improvement

Zhang,

Jiao,

et al. 2024

Journal of Materials Research and Technology

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Evolution of Structure and Properties of Micro-Nano Structure 2507 Duplex Stainless Steel Prepared by Aluminothermic Reduction

et al. 2022

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In this work, a large ingot of micro-nano structure 2507 duplex stainless steel was prepared in a single step using the aluminothermic reaction method. Chromium having different excess fractions were added to reaction powders to make up for evaporation loss, and the results show that the composition and structure of 2507 duplex stainless steel with a chromium excess ratio of 70% are satisfactory. The volume fraction of nanocrystalline in as-cast alloy was 41% and the average grain size was 34 nm. Additionally, the anticipated steels were rolled roughly with deformation of 40% at 1000 °C and followed by fine rolling with deformation of 30, 50 and 70%, separately, at 800 °C. Then, the effects of rolling deformation and precipitation on mechanical properties were studied in detail. Compared with the as-cast alloy, there was no phase transformation in the alloys with deformation of 30 and 50%, and they were still composed of γ and α phases, whereas the σ phase appeared in the alloy with deformation of 70%. When the deformation was 50%, the rolled alloy achieved the best performance, and the tensile strength, yield strength, and elongation were 912 MPa, 523 MPa, and 24.3%, respectively.

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Characteristics of Flakes Stacked Cr2N with Many Domains in Super Duplex Stainless Steel

Cited by 3 publications

References 27 publications

Correction of Phase Balance on Nd:YAG Pulsed Laser Welded UNS S32750 Using Cobalt Electroplating Technique

Correction of Phase Balance on Nd:YAG Pulsed Laser Welded UNS S32750 Using Cobalt Electroplating Technique

Investigation of Selective Laser Melting of 2205 steel precipitates and heat treatment improvement

Evolution of Structure and Properties of Micro-Nano Structure 2507 Duplex Stainless Steel Prepared by Aluminothermic Reduction

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