In-situ XRD investigation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi>σ</mml:mi></mml:math> phase precipitation kinetics during isothermal holding in a hyper duplex stainless steel

Schuster, R.; Keplinger, Andreas; Jacob, Aurélie; Kreyca, Johannes; Solyom, Laszlo; Maawad, Emad; Povoden-Karadeniz, Erwin

doi:10.1016/j.matchar.2023.113124

Cited by 6 publications

(1 citation statement)

References 22 publications

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“…The precipitation behavior, influencing factors, and effects of the sigma phase on DSS have been widely studied. [ 20–34 ] Kazuhiro reported the effects of alloying elements on the precipitation of the sigma phase in SDSS. [ 26,27 ] The authors found that Cr and Mo, which are useful for improving the corrosion resistance, can promote sigma‐phase precipitation, but the phase does not always grow rapidly.…”

Section: Introductionmentioning

confidence: 99%

Sigma‐Phase Distribution in 2507 Super Duplex Stainless Steel Continuous Casting Slabs

Chen,

Qiao,

Cheng

et al. 2023

steel research int.

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The sigma‐phase distribution in a 2507 super duplex stainless steel continuous casting slab is analyzed using microstructural analyses and thermodynamic calculations. The sigma phase contains high Cr and Mo contents, and precipitates along the phase boundary between austenite and ferrite and grows toward the interior of the ferrite phase in the continuously cast slab. The sigma‐phase fraction at the center of the width direction is higher than that in the one fourth width. Furthermore, the sigma‐phase fraction at the center of the thickness direction is higher than those at the upper and lower surfaces, which is due to the lower cooling rate at the center. The Brinell hardness (HB) at the center increases to 313 HB with an increasing sigma‐phase fraction. The sigma‐phase fraction at the one fourth thickness near the lower surface is higher than that at the one fourth thickness near the upper surface at the same cooling rate. Additionally, Mo and Ni are severely segregated in this zone. A higher Mo content influences the precipitation and stabilization of the sigma phase. Furthermore, Scheil–Gulliver calculations indicate that compositional segregation results in an increase in the sigma‐phase precipitation temperature range.

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Section: Introductionmentioning

confidence: 99%

Sigma‐Phase Distribution in 2507 Super Duplex Stainless Steel Continuous Casting Slabs

Chen,

Qiao,

Cheng

et al. 2023

steel research int.

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Significant improvement of tensile strength by deceleration of crack propagation in duplex Fe-Cr-Ni-based alloy

Dai,

Liu,

Liu

et al. 2024

J Mater Sci

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Study of Interface-Related Mechanisms in the Early Stage Precipitation of σ Phase in Hyper Duplex Stainless Steels

Jacob,

Schuster,

Solyom

et al. 2023

J. Phase Equilib. Diffus.

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This work aims to computationally explore the diffuse prerequisites for σ phase precipitation in high-alloyed duplex steels. The diffusion control for the early precipitation stage of the σ phase was studied by the Calphad thermodynamic modeling combined with the DICTRA software. Different nucleation sites, α/γ, and α/α and γ/γ grain-boundaries, were studied using thermodynamic and mobility databases developed by the present authors in previous works for high-alloyed duplex stainless steel. Simulation results were compared to experimentally obtained microstructures of aged samples. The study of the concentration profiles of the elements Cr, Mo, and Ni revealed that the precipitation is most favorable within the α phase due to fast mobility and strong thermodynamic driving force favoring the formation of the σ phase. Based on the present results, the role of the different heterogeneous sites for the precipitation of the σ phase in hyper duplex steel is discussed.

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In-situ XRD investigation of σ phase precipitation kinetics during isothermal holding in a hyper duplex stainless steel

Cited by 6 publications

References 22 publications

Sigma‐Phase Distribution in 2507 Super Duplex Stainless Steel Continuous Casting Slabs

Sigma‐Phase Distribution in 2507 Super Duplex Stainless Steel Continuous Casting Slabs

Significant improvement of tensile strength by deceleration of crack propagation in duplex Fe-Cr-Ni-based alloy

Study of Interface-Related Mechanisms in the Early Stage Precipitation of σ Phase in Hyper Duplex Stainless Steels

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