<i>In situ</i> study of sigma phase formation in Cr–Co–Ni ternary alloys at 800°C using the long duration experiment facility at Diamond Light Source

Connor, Leigh D.; Christofidou, Katerina A.; Jones, N.G.; Baker, Annabelle R.; Tang, C. C. H.; Guérin, Samuel; Stone, Howard J.

doi:10.1107/s1600577518009475

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…The lower limit in volume fraction that can be detected by SAS depends strongly on the contrast, however as a rule of thumb it lies roughly between 0.01 and 0.1 %. When dealing with larger precipitates of significant volume fraction (>1%), in-situ X-ray diffraction (XRD) is more adapted [39][40][41][42]. It gives a more direct access to the volume fraction when the crystal structure of the precipitates is known and in cases where the material's texture is sufficiently random.…”

Section: In-situ Techniquesmentioning

confidence: 99%

Precipitation kinetics in metallic alloys: Experiments and modeling

2021

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Section: In-situ Techniquesmentioning

confidence: 99%

Precipitation kinetics in metallic alloys: Experiments and modeling

2021

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“…The microstructural arrangement of intermetallic σ presents a ternary phase whose formation is based on high chromium content 11 . This phase's precipitation mainly takes place at the ferrite/austenite interface and it is often generated by increased chromium diffusion from the ferritic phase to the grain boundary [12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Sigma Phase Detection in Duplex Stainless Steel Based on Correlation to Current and Potential in Micro Electrode Electrochemical of Surface

Forteski,

Helleis,

Valt

et al. 2024

Mat. Res.

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Duplex stainless steels are widely used due to their good mechanical properties and corrosion resistance. However, they are susceptible to microstructural fragility related to harmful transformations taking place in intermetallic phases, such as the sigma phase. These transformations reduce mechanical properties like toughness and corrosion resistance. The current study aims to analyze the effect of different thermodynamic-and electrochemical-reactive phases based on using both linear sweep voltammetry tests as non-destructive tests, as well as the concept of microelectrodes. This technique is capable of detecting small amounts of intermetallic phases at the UNS-S31803 duplex stainless steel surface. Results have evidenced the influence of reduced electrode-solution exposure area on improving sensitivity for deleterious phase analyses. Peak potential and current peak recorded direct correlation to sigma phase concentration and it enabled detecting very low sigma-phase surface concentration, at the order of 0.04%. The study has shown improved sensitivity of linear sweep voltammetry tests used to detect harmful phases in duplex stainless steels.

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“…Larger resistance furnaces have been used for X-ray diffraction experiments, notably Linkam furnaces used on a number of beamlines (Connor et al, 2018). These are capable of reaching high temperatures (1500 C) and ramp rates (200 C min À1 ) (Oversluizen et al, 1995;Bras & Ryan, 1998) and seem like a good option for solid state measurements, though the enclosed system may limit sample environment options.…”

Section: Introductionmentioning

confidence: 99%