Influence of severe plastic deformation in phase transformation of superduplex stainless steels

Llorca-Isern, Núria; Biserova-Tahchieva, Alisiya; López-Jiménez, Isabel; Calliari, Irene; Cabrera, J.M.; Roca, A.

doi:10.1007/s10853-018-2984-y

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…In order to analyse any further precipitation after the carburizing process, short holding time post-thermal treatments were carried out at 830 ± 2 • C to carburize samples followed by water quenching. These conditions of thermal treatment were selected in order to compare the results to previous precipitation research [20].…”

Section: Methodsmentioning

confidence: 99%

Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS

2020

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In this study, the effect of a plasma ion carburizing process to duplex and superduplex stainless steels (DSS and SDSS), at 925 °C for a long time, as thermochemical process influencing the microstructural evolution is presented. The objective is to analyse the diffusion elements’ influence on the precipitation of secondary phases after additional short thermal treatment. A comparison among the different treatments was performed after the resulting microstructures were analysed by Field Emission—Scanning Electron Microscope. Precipitation of secondary phases—sigma (σ), chi (χ), nitrides and carbides—seemed to occur during the treatments in a similar way for both steels (DSS and SDSS), although they showed a different morphology and precipitation mode. General corrosion behaviour of untreated and treated samples was investigated by potentiodynamic tests in order to prove their corrosion resistance. It was found that an improvement of the surface protection after the plasma carburizing process occurred.

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Section: Methodsmentioning

confidence: 99%

Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS

2020

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“…After the plasma nitriding process, thermal treatment at 830 • C for up to 3 min was carried out for the superduplex stainless steels. This treatment was selected in order to compare the precipitation of secondary phases before and after nitriding and the influence of a large concentration of nitrogen in that precipitation [58,59]. As observed in the images from backscattered electron microscopy (BSE) of SDSS plate cross-section (Figure 2a,b), precipitates of chromium nitride are identified inside the expanded ferrite phase.…”

Section: Surface Modification Technologiesmentioning

confidence: 99%

Duplex and Superduplex Stainless Steels: Microstructure and Property Evolution by Surface Modification Processes

Biserova-Tahchieva

Llorca-Isern

Cabrera

2019

Metals

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The paper presents an overview of diffusion surface treatments, especially nitriding processes, applied to duplex and superduplex stainless steels in the last five years. Research has been done mainly to investigate different nitriding processes in order to optimize parameters for the most appropriate procedure. The scope has been to improve mechanical and wear resistance without prejudice to the corrosion properties of the duplex and superduplex stainless steels. Our investigation also aimed to understand the effect of the nitriding layer on the precipitation of secondary phases after any heating step.

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“…DSS inherits outstanding toughness and weldability from its austenite parts and also combines the mechanical robustness, chloride resistance, and high corrosion resistance from its ferrite counterparts. The yield strength of DSS is approximately twice that of austenitic stainless steel, and it shows preponderant resistance to pitting corrosion [11][12][13]. Martensitic stainless steel exhibits high strength, high hardness, and low wear rate, but the poor corrosion properties due to its high carbon content extremely limits its wide use in some highly corrosive environments [14,15].…”

Section: Articlementioning

confidence: 99%

On the microstructure and mechanical properties of silver-bearing antibacterial CD4MCu duplex stainless steels: Solid solution temperature

Xiang¹,

Liu²,

Chen³

et al. 2019

mat express

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The Ag-bearing antibacterial stainless steel has attracted substantial attention in the field of bacterial proliferation prevention. In this study, a Cu–Ag alloy was incorporated into a CD4MCu duplex stainless steel (DSS) to produce a good antibacterial property. The Ag-bearing CD4MCu duplex stainless steel samples were conducted solid solution treatment at various temperatures. The effects of the solid solution temperature on the microstructure, mechanical and corrosion properties, as well as silver ion release characteristics and antibacterial properties were investigated. Results show that apart from the original α, γ phases, Ag-bearing phases were formed in all samples after solid solution at different temperatures. The volume fraction of α and Ag-bearing phases decrease with increasing solution temperature. The tensile strength, hardness, elongation, and corrosion resistance first decrease and then increase along with the increase in the solid solution temperature. The heat treatment conducted at 1150 °C increases the strength, the hardness, the pitting corrosion resistance, and the antimicrobial capability simultaneously. The antibacterial rates of all the Ag-bearing CD4MCu duplex stainless steel samples after solid solution treatment are above 99%, indicating their good anti-bacterial capabilities.

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Influence of severe plastic deformation in phase transformation of superduplex stainless steels

Cited by 8 publications

References 12 publications

Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS

Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS

Duplex and Superduplex Stainless Steels: Microstructure and Property Evolution by Surface Modification Processes

On the microstructure and mechanical properties of silver-bearing antibacterial CD4MCu duplex stainless steels: Solid solution temperature

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