Resistance of nanocrystalline vis-à-vis microcrystalline Fe–Cr alloys to environmental degradation and challenges to their synthesis

Raman, R.K. Singh; Gupta, Rajeev; Koch, Carl C.

doi:10.1080/14786435.2010.484402

Cited by 32 publications

(24 citation statements)

References 33 publications

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“…3-Grain growth in Fe-10Cr nanocrystalline alloy at 773 K, 873 K, and 973 K (500°C, 600°C, and 700°C). [106] …”

Section: B Synthesis Of Nanocrystalline Alloysmentioning

confidence: 99%

“…This influence is enhanced at 623 K and 673 K (350°C and 400°C). (b) Both nc and mc alloys follow parabolic kinetics in the initial period (as was evidenced by the weightgain 2 vs time plots [106] ). But, during subsequent oxidation, nc Fe-10Cr alloy showed a considerable departure from the parabolic behavior whereas mc alloy continued to follow parabolic kinetics.…”

Section: B Alumina Forming Nanocrystalline Alloys/coatingsmentioning

confidence: 99%

“…[204][205][206][207] The low-Cr alloys (15 to 60 lm) suffer predominant and extensive oxidation [196] along grain boundaries, and a decrease in grain size increases this internal oxidation. [206,207] Singh Raman et al [106] have demonstrated a profound role of nanocrystalline (nc) structure in improving the oxidation resistance of Fe-Cr binary alloys. Figure 19 shows a comparison between the oxidation kinetics of nanocrystalline vis-a´-vis microcrystalline Fe-10Cr alloy in the temperature range 573 K to 673 K (300°C to 400°C).…”

Section: B Alumina Forming Nanocrystalline Alloys/coatingsmentioning

confidence: 99%

“…Recent studies have shown that the effect of reducing the grain size to nanocrystalline regime can significantly improve the high temperature oxidation resistance of Fe-based alloys due to the enhanced diffusion of beneficial alloying elements to the alloy surface facilitating the formation of a protective oxide layer. [8,106] Most metals/alloys are thermodynamically reactive in various environments like polluted water, saline, acidic or alkaline solutions. [104,105] A metal/alloy when exposed to a corrosive environment can undergo active dissolution, passivation or localized corrosion.…”

Section: Corrosion/oxidation Of Nanocrystalline Metals and Alloysmentioning

confidence: 99%

“…2-XRD profiles for ball-milled nanocrystalline Fe-10Cr alloy annealed at 873 K (600°C) for different time periods. [106] temperature employing a pressure of 3 GPa. Compacted pellets were sintered for 1 hour at 873 K (600°C), which further improved the density (close to 100 pct of the theoretical density).…”

Section: B Synthesis Of Nanocrystalline Alloysmentioning

confidence: 99%

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Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

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The extremely fine grain size of nanocrystalline (nc) metallic alloys results in significantly different mechanical, electrochemical and oxidation properties as compared to the coarse-grained alloys of the same composition. Although the synthesis and attractive mechanical properties of nanocrystalline materials have been investigated and reviewed in great depth, the high temperature oxidation and electrochemical corrosion of these materials has received limited attention. The difference in the active dissolution and passivation behavior of nc alloys as compared to their microcrystalline counterparts varies for each alloy system. However, a unified theory explaining these phenomena still eludes us. In this context, this article reviews the progress in the electrochemical corrosion behavior of different nanocrystalline alloys, and hence, develops a better understanding of the effect of grain size, composition, interfacial phenomena and selective dissolution on corrosion of nanocrystalline alloys. This review also presents the role of nanometric grain size and the associated increase in grain boundary diffusion on the high temperature oxidation of nc alloys. The attractive possibility of enhanced oxidation resistance at lower alloying additions as compared to the coarse-grained alloys has been discussed. Although the primary focus of the article is on ferrous alloy systems, however, the lead studies on the role of ultrafine grain size in oxidation/corrosion behavior of other alloys systems have also been reviewed.

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“…3-Grain growth in Fe-10Cr nanocrystalline alloy at 773 K, 873 K, and 973 K (500°C, 600°C, and 700°C). [106] …”

Section: B Synthesis Of Nanocrystalline Alloysmentioning

confidence: 99%

Section: B Alumina Forming Nanocrystalline Alloys/coatingsmentioning

confidence: 99%

Section: B Alumina Forming Nanocrystalline Alloys/coatingsmentioning

confidence: 99%

Section: Corrosion/oxidation Of Nanocrystalline Metals and Alloysmentioning

confidence: 99%

Section: B Synthesis Of Nanocrystalline Alloysmentioning

confidence: 99%

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Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

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Synergy of Nanocrystallinity, Temperature, and “the Third Element Effect” for Uncommon Oxidation Resistance of Fe‐Cr‐Al Alloys

Raman,

Kumar,

Bakshi

2024

Small

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Nanocrystalline structure, oxidation temperature, and “The Third Element Effect” are among the factors that can profoundly govern the characteristics of the oxide scales that develop on oxidation‐resistant alloys, thereby, their synergistic effect can considerably influence alloys’ oxidation kinetics. As a result of the synergy, certain iron‐chromium‐aluminium (Fe‐Cr‐Al) alloy showed superior oxidation resistance at 800 °C than at 700 °C (whereas oxidation resistance commonly decreases with the increase in temperature). The superior resistance at higher temperatures is considerably enhanced when the structure of the alloy is nanocrystalline vis‐à‐vis the common microcrystalline structure. Nanocrystalline alloy oxidizes at a negligible rate (c.f., its microcrystalline counterpart). The characterization of the oxide scale demonstrates that the oxidation temperature governs the formation of the protective oxide scale with/without the assistance of the “Third element Effect”. The findings may potentially have considerable commercial implications.

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Design of Heterogeneous Lamella Microstructure of 316L Austenitic Stainless Steel and Effect of Aging on Its Mechanical Behavior and Corrosion Properties

Liu,

Li,

Gao

et al. 2024

steel research int.

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316L austenitic stainless steel (ASS) with a heterogeneous structure exhibits favorable mechanical properties at room temperature, promising excellent application potential. However, the thermal stability of 316L ASS with heterogeneous lamella structure (HLS) has not been adequately addressed yet. Herein, an HLS of 316L ASS is fabricated through 78% cold rolling followed by annealing at 750 °C for 13 min. The detailed investigation focuses on the influence of microstructure evolution on the mechanical properties and corrosion resistance of the alloy after aging at temperatures ranging from 350 to 550 °C for 100 h. The results show that a notable quantity of residual martensite persists even after annealing at high temperatures for a brief duration. The dislocation density of the test steel is reduced after long‐term aging treatment, and the residual martensite is further reversed into austenite during aging. In addition, the aging treatment also promotes further growth of nanocrystalline/ultrafine‐grained, which weakens the heterogeneous characteristics of HLS 316L ASS, resulting in a slight decrease in mechanical properties. However, the decrease in defect density and the enhancement of recrystallization degree are beneficial for eliminating most of the corrosion‐sensitive areas in the cold‐deformed structure, thereby improving the corrosion resistance.

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Resistance of nanocrystalline vis-à-vis microcrystalline Fe–Cr alloys to environmental degradation and challenges to their synthesis

Cited by 32 publications

References 33 publications

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Synergy of Nanocrystallinity, Temperature, and “the Third Element Effect” for Uncommon Oxidation Resistance of Fe‐Cr‐Al Alloys

Design of Heterogeneous Lamella Microstructure of 316L Austenitic Stainless Steel and Effect of Aging on Its Mechanical Behavior and Corrosion Properties

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