Application of Grain Boundary Engineering to Improve Intergranular Corrosion Resistance in a Fe–Cr–Mn–Mo–N High-Nitrogen and Nickel-Free Austenitic Stainless Steel

Shi, Feng; Gao, Ruo-Han; Guan, Xianjun; Liu, Chunming; Li, Xiaowu

doi:10.1007/s40195-020-01000-8

Cited by 25 publications

(14 citation statements)

References 44 publications

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“…2, the SBs in Inconel 625 are mainly composed of Σ3 n (n=1, 2, 3) boundaries, in addition to a small amount of other low CSL boundaries, the Σ3 boundaries are dominant among these SBs. This result is similar to that of austenitic stainless steel and Inconel 600 [54][55][56] . Besides, the misorientation between the annealing twins and the parent grains is <111>/60°, which is exactly the Σ3 misorientation relationship in the CSL model.…”

Section: Gbcd Formationsupporting

confidence: 87%

Improving Intergranular Corrosion Resistance in Inconel 625 via Grain Boundary Character Distribution Optimization

Wang

Gao

et al. 2021

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The feasibility of applying the grain boundary character distribution (GBCD) optimization to Inconel 625 for improving the intergranular corrosion (IGC) resistance was studied. The GBCD was obtained and characterized by electron backscatter diffraction (EBSD) analysis, and its optimization was mainly attributed to annealing twins (Σ3) and twins related to boundaries formed during thermal-mechanical processing (TMP). Through TMP of 5% cold rolling and subsequent annealing at 1150 ℃ for 5 min, the proportion of low Σ coincidence site lattice (CSL) grain boundaries of the Inconel 625 can be enhanced to about 35.8% which mainly were of Σ3 n (n=1, 2, 3) type. There is an increase of 24.8% compared with the solution-treated sample, and simultaneously the large-size highly-twinned grain-cluster microstructure is formed. The grain-cluster is mainly composed of Σ3-Σ3-Σ9 or Σ3-Σ9-Σ27 triple junctions, which is mainly caused by boundary reactions during grain growth. Among them, the IGC resistance of Σ3 grain boundaries, Σ9 grain boundaries and random grain boundaries is sequentially weakened. With the increase of the low ΣCSL grain boundary fraction, the IGC resistance of Inconel 625 improves. The essential reason is the amount of Σ3 boundaries interrupting the random boundary network increases and the large grain-cluster arrests the penetration of IGC.

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Section: Gbcd Formationsupporting

confidence: 87%

Improving Intergranular Corrosion Resistance in Inconel 625 via Grain Boundary Character Distribution Optimization

Wang

Gao

et al. 2021

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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“…These help to block the connectivity of high-angle grain boundaries and prevent the expansion of corrosion cracks associated with such boundaries. To a certain extent, this reduces the corrosion tendency of HNS and results in improved corrosion resistance [25].…”

Section: Experimental Methodsmentioning

confidence: 99%

Corrosion Behaviors of Fe-22Cr-16Mn-0.55N High-Nitrogen Austenitic Stainless Steel in 3.5% NaCl Solution

Gao

Han

et al. 2022

Coatings

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In this study, the corrosion behavior of the high-nitrogen austenitic stainless steel (HNS) Fe-22Cr-16Mn-0.55N before and after solution treatment (ST) in 3.5% NaCl solution has been investigated. The effect of a solution temperature of 1100 °C and heat preservation for 30 min on the corrosion resistance and passive film protection of HNS steel was studied. Open-circuit potential, potentiodynamic polarization and electrochemical impedance tests were used to assess the corrosion resistance of treated and untreated steels. In addition, potentiostatic polarization and XPS techniques together with Mott–Schottky curves were applied to determine the composition and properties of the passive films. The results showed that after solution treatment, the grain size of HNS decreased and the grain became more uniform. Although corrosion occurred on HNSs both before and after treatment, solution treatment resulted in greater compactness in passive films, leading to lower carrier density, lower corrosion current density and better corrosion resistance.

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“…It is noted that not all types of low-ΣCSL boundaries exhibit strong inhibition of IGC cracks. Shi et al [ 94 ] suggested that only Σ3 twin boundaries play an effective role in the IGC resistance of Fe-20Cr-19Mn-2Mo-0.82N austenitic stainless steel, while random HAGBs and Σ9, Σ11, and Σ27 twin boundaries do not withstand IGC under the experimental conditions. Hu et al [ 79 ] improved the IGC resistance of 304 stainless steel by controlling GBCD.…”

Section: Application Of Twinning-related Grain Boundary Engineeringmentioning

confidence: 99%

A Review on Controlling Grain Boundary Character Distribution during Twinning-Related Grain Boundary Engineering of Face-Centered Cubic Materials

et al. 2023

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Grain boundary engineering (GBE) is considered to be an attractive approach to microstructure control, which significantly enhances the grain-boundary-related properties of face-centered cubic (FCC) metals. During the twinning-related GBE, the microstructures are characterized as abundant special twin boundaries that sufficiently disrupt the connectivity of the random boundary network. However, controlling the grain boundary character distribution (GBCD) is an extremely difficult issue, as it strongly depends on diverse processing parameters. This article provides a comprehensive review of controlling GBCD during the twinning-related GBE of FCC materials. To commence, this review elaborates on the theory of twinning-related GBE, the microscopic mechanisms used in the optimization of GBCD, and the optimization objectives of GBCD. Aiming to achieve control over the GBCD, the influence of the initial microstructure, thermo-mechanical processing (TMP) routes, and thermal deformation parameters on the twinning-related microstructures and associated evolution mechanisms are discussed thoroughly. Especially, the development of twinning-related kinetics models for predicting the evolution of twin density is highlighted. Furthermore, this review addresses the applications of twinning-related GBE in enhancing the mechanical properties and corrosion resistance of FCC materials. Finally, future prospects in terms of controlling the GBCD during twinning-related GBE are proposed. This study will contribute to optimizing the GBCD and designing GBE routes for better grain-boundary-related properties in terms of FCC materials.

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Application of Grain Boundary Engineering to Improve Intergranular Corrosion Resistance in a Fe–Cr–Mn–Mo–N High-Nitrogen and Nickel-Free Austenitic Stainless Steel

Cited by 25 publications

References 44 publications

Improving Intergranular Corrosion Resistance in Inconel 625 via Grain Boundary Character Distribution Optimization

Improving Intergranular Corrosion Resistance in Inconel 625 via Grain Boundary Character Distribution Optimization

Corrosion Behaviors of Fe-22Cr-16Mn-0.55N High-Nitrogen Austenitic Stainless Steel in 3.5% NaCl Solution

A Review on Controlling Grain Boundary Character Distribution during Twinning-Related Grain Boundary Engineering of Face-Centered Cubic Materials

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