Effect of tungsten on the oxidation of alumina-forming austenitic stainless steel

Ha, Heung Yong; Kim, Sung Dae; Park, Jun Yong; Jang, Min‐Ho; Lee, Tae‐Ho

doi:10.1186/s42649-019-0014-4

Cited by 5 publications

(4 citation statements)

References 35 publications

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“…This is how the prolongation of time to oxide breakaway is achieved. As reported by the authors of [20], apart from the decreasing oxide thickness, the most significant change in W alloying was the increased proportion of secondary phase at the oxide/matrix interface and also in the matrix.…”

Section: Introductionsupporting

confidence: 55%

“…Similarly, Si distribution changed with oxidation time. Its bright regions in Figure 5h indicated a higher concentration at the inner-oxide-layer/matrix interface [20]. Furthermore, the authors of [37] confirmed that long-term oxidation resulted in stable Si oxides' formation and their segregation at the oxide/metal-matrix interface.…”

Section: Eds Sem Maps Of Marbn Steel Oxide Layer After Oxidation At 6...mentioning

confidence: 80%

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Experimental Study of the Evolution of Creep-Resistant Steel’s High-Temperature Oxidation Behavior

et al. 2023

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This study shows that in an atmosphere containing water vapor, the oxide layer on the surface of the 9CrNB steel MarBN (Martensitic 9Cr steel strengthened by Boron and MX Nitrides) was formed by an outer layer of hematite Fe2O3 and Cr2O3 and an inner two-phase layer of Fe3O4 and Fe3O4 + (Fe, Cr)2O4, which was confirmed by XRD analysis. Part of the layer consisted of nodules and pores that were formed during the increase in oxides when the present H2O(g) acted on the steel surface. The diffusion mechanism at temperatures of 600 and 650 °C and at longer oxidation times supported the “healing process” with a growing layer of Fe oxides and the presence of Cr and minor alloying elements. The effects of alloying elements were quantified using a concentration profile of the oxide layer based on quantitative SEM analysis, as well as an explanation of the mechanism influencing the structure and chemical composition of the oxide layer and the steel-matrix–oxide interface. In addition to Cr, for which the content reached the requirement of exceeding 7.0 wt. % in the inner oxide layer, W, Co, Mn, and Si were also found in increased concentrations, whether in the form of the present Fe-Cr spinel oxide or as part of a continuously distributed layer of Mn2O3 and SiO2 oxides at the steel-matrix–oxide interface. After long-term high-temperature oxidation, coarser carbides of the M23C6 type (M = Fe,W) significantly depleted in Cr were formed at the oxide-layer/matrix interface. In the zone under the oxide layer, very fine particles of MC (M = V, Nb, and to a lesser extent also Cr in the particle lattice of the given phase) were observed, with a higher number of particles per unit area compared to the state before oxidation. This fact was a consequence of Cr diffusion to the steel surface through the subsurface zone.

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Section: Introductionsupporting

confidence: 55%

Section: Eds Sem Maps Of Marbn Steel Oxide Layer After Oxidation At 6...mentioning

confidence: 80%

Experimental Study of the Evolution of Creep-Resistant Steel’s High-Temperature Oxidation Behavior

et al. 2023

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“…In addition, for 22Cr-25Ni high chromium AFA steels, Nan Dong et al [ 110 ] found that through the first principles analysis, silicon could improve the oxidation resistance by increasing the adhesion of interface among the multi-layer oxide scale (Fe/Al 2 O 3 /Cr 2 O 3 ). The enhancement of tungsten on oxidation resistance mainly lies in the limitation of W-rich secondary phase to oxygen diffusion precipitated from the metal and oxygen interface [ 111 ].…”

Section: Corrosion Resistancementioning

confidence: 99%

Research Progress of Alumina-Forming Austenitic Stainless Steels: A Review

et al. 2022

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The development of Alumina-Forming Austenitic (AFA) stainless steel is reviewed in this paper. As a new type of heat-resistant steel, AFA steel forms an alumina protective scale instead of chromia in a corrosive environment. This work summarizes the types of developed AFA steels and introduces the methods of composition design. Various precipitates appear in the microstructure that directly determine the performance at high temperatures. It was found that alloy elements and the heat treatment process have an important influence on precipitates. In addition, the corrosion resistance of AFA steel in different corrosive environments is systematically analyzed, and the beneficial or harmful effects of different elements on the formation of alumina protective scale are discussed. In this paper, the short-term mechanical properties, creep properties and influencing factors of AFA steel are also analyzed. This work aims to summarize the research status on this subject, analyze the current research results, and explore future research directions.

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“…Modifying these two parameters determines the steel microstructures and associated mechanical performance for a given corrosive environment e.g., water, oxygen, or humid environment [12][13][14][15][16][17][18][19][20]. Along-with steel composition [21], employing different heat-treatment processes is a facile route to improve not only the microstructure stability but also the corrosion properties [22]. Hence, the systematic study on the relation between the two parameters and the microstructures is vital for the upcoming AI era.…”

Section: Introductionmentioning

confidence: 99%

Microstructural, mechanical, and electrochemical analysis of carbon doped AISI carbon steels

Ishtiaq

Inam

Tiwari

et al. 2022

Preprint

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The effect of carbon doping contents on the microstructure, hardness, and corrosion properties of heat-treated AISI steel grades of plain carbon steel was investigated in this study. Various microstructures including coarse ferrite-pearlite, fine ferrite-pearlite, martensite, and bainite were developed by different heat treatments i.e. annealing, normalizing, quenching, and austempering, respectively. The developed microstructures, micro-hardness, and corrosion properties were investigated by a light optical microscope, scanning electron microscope, electromechanical (Vickers Hardness tester), and electrochemical (Gamry Potentiostat) equipment, respectively. The highest corrosion rates were observed in bainitic microstructures (2.68 – 12.12 mpy), whereas the lowest were found in the fine ferritic-pearlitic microstructures (1.57- 6.36 mpy). A direct correlation has been observed between carbon concentration and corrosion rate, i.e. carbon content resulted in an increase in corrosion rate (2.37 mpy for AISI 1020 to 9.67 mpy for AISI 1050 in annealed condition).

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Effect of tungsten on the oxidation of alumina-forming austenitic stainless steel

Cited by 5 publications

References 35 publications

Experimental Study of the Evolution of Creep-Resistant Steel’s High-Temperature Oxidation Behavior

Experimental Study of the Evolution of Creep-Resistant Steel’s High-Temperature Oxidation Behavior

Research Progress of Alumina-Forming Austenitic Stainless Steels: A Review

Microstructural, mechanical, and electrochemical analysis of carbon doped AISI carbon steels

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