Computational modeling of a 3D matrix of duplex stainless steel and its ultimate strength in function of the sigma phase evolution

Santos, Ana Gabriela Conceição dos; Ignácio, Nathan Fernandes; Fernandes, Maisa Silva; Baía, Diego Magalhães; Moreira, Fernanda Nascimento; Assis, Weslley Luiz da Silva; Rios, Paulo Rangel

doi:10.1016/j.jmrt.2021.09.051

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…There has been significant development of computational process modelling in steel industry all around the world, as described by the publications from different research groups [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The models described in those studies are capable of providing important insights into the process development and they can be utilized in steel production.…”

Section: Discussionmentioning

confidence: 99%

“…Colorado School of Mines group has developed several models for microstructure evolution to enhance industrial processing [9][10]. Numerical modelling tools are also developed by several other research groups [11][12][13][14]. The benefit of the numerical process modelling is to reduce the expensive production trials and to provide understanding of the most important factors affecting the metallurgical industrial processes.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modelling of Thermo-Mechanical Processes in Steels - An Overview and Recent Progress

Pohjonen

Ilmola

Seppälä

et al. 2023

MSF

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Numerical modelling tools provide valuable means to quantitatively control thermomechanical processing. Several modelling tools have been applied and developed at University of Oulu during previous years, such as finite element models for hot rolling, recrystallization models, heat transfer and conduction model, coupled with phase transformation, as well as cellular automata and phase field models for simulating phase transformation during cooling. This article describes the overall development and recent progress of the developed numerical modeling tools.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Thermo-Mechanical Processes in Steels - An Overview and Recent Progress

Pohjonen

Ilmola

Seppälä

et al. 2023

MSF

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“…Sigma (σ) phase is one of the most studied deleterious phases that can be present on DSS and SDSS [12,13,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Temperature Time Transformation (TTT) diagrams show that this phase is usually formed in the 800-950°C temperature range [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

DL-EPR vs. LSV-KOH: from simple detection of deleterious phases to analysis of morphology and high accuracy on determination of sigma phase in UNS S32750 stainless steel

Sampaio

Furtado

Ignácio

et al. 2022

Corrosion Engineering, Science and Technology

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An optimised electrochemical technique, linear sweep voltammetry (LSV) in KOH solution (LSV-KOH) was confronted with the double loop electrochemical Potentiokinetic reactivation (DL-EPR) to verify which is the best technique to quantify deleterious phases (DP) in a UNS S32750 super duplex stainless steel. DL-EPR presented an error in determination of deleterious phases in the range of 6.9-100%. LSV-KOH show a better accuracy in quantification of deleterious phases volume fractions, the error range for LSV-KOH was 2.4-26.2%. When the morphology of sigma changes from lamellar to divorced, was observed modifications on LSV-KOH voltammograms. In specimens where lamellar morphology is present, the voltammograms show two peaks curve. Meanwhile, in specimens where occurred also divorced precipitation of sigma the voltammograms changes to a 3 peaks curve. This feature is due to the dissolution of sigma phase boundaries which has different compositions according to the form of sigma precipitation.

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A Comparison of Sigma Phase Formation in Solubilized Hyper Duplex Stainless Steel and Super Duplex Stainless Steel Filler Metals

Acuna,

Riffel,

Ramirez

2024

Metall Mater Trans A

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This study focuses on the kinetic analysis of sigma phase formation in filler metal wires on Super Duplex Stainless Steel (SDSS) and Hyper Duplex Stainless Steel (HDSS). Precipitation data reveal that in the solubilized microstructure, sigma phase kinetics are more prominent in SDSS. This increased susceptibility is attributed to the greater number of nucleation sites, which is facilitated by the larger interface area/volume and the higher chromium content in the ferrite. The difference in interface area/volume is significantly more influential in determining kinetics than the composition difference, with nucleation sites playing a central role. The sigma phase transformation in both materials was modeled using the JMAK kinetic law. The JMAK plots exhibit a transition in kinetic mechanisms, evolving from discontinuous precipitation to diffusion-controlled growth. In SDSS, the JMAK values indicate “grain boundary nucleation after saturation,” followed by “thickening of large plates.” In contrast, HDSS values point to “grain edge nucleation after saturation,” followed by “thickening of large needles.” The higher kinetics in SDSS are characterized by a smaller nucleation activation energy of 56.4 kJ/mol, in contrast to HDSS's 490.0 kJ/mol. CALPHAD-based data support the JMAK results, aligning with the maximum kinetics temperature of SDSS (875 °C to 925 °C) and HDSS (900 °C to 925 °C). Therefore, the JMAK sigma phase kinetics effectively describe the experimental data and its dual kinetics behavior, even though CALPHAD-based TTT calculations often overestimate sigma formation.

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Computational modeling of a 3D matrix of duplex stainless steel and its ultimate strength in function of the sigma phase evolution

Cited by 6 publications

References 9 publications

Numerical Modelling of Thermo-Mechanical Processes in Steels - An Overview and Recent Progress

Numerical Modelling of Thermo-Mechanical Processes in Steels - An Overview and Recent Progress

DL-EPR vs. LSV-KOH: from simple detection of deleterious phases to analysis of morphology and high accuracy on determination of sigma phase in UNS S32750 stainless steel

A Comparison of Sigma Phase Formation in Solubilized Hyper Duplex Stainless Steel and Super Duplex Stainless Steel Filler Metals

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