Microstructure Aspects of a Newly Developed, Low Cost, Corrosion-Resistant White Cast Iron

Sain, P. K.; Sharma, C. P.; Bhargava, Anil K.

doi:10.1007/s11661-012-1524-7

Cited by 11 publications

(3 citation statements)

References 3 publications

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“…At relatively high corrosion intensity, the white cast irons with higher alloy content (especially chromium) clearly showed improved corrosion resistance and combined erosion-corrosion resistance over those with lower alloy content. Although Ni-resist irons showed good corrosion resistance to many environments and are frequently used, they lack sufficient mechanical strength and suitability at a service temperatures higher than (800°C) [10]. Single phase microstructures are most suitable in resisting corrosion for obvious reasons.…”

Section: Introductionmentioning

confidence: 99%

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

et al. 2015

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This study aims to investigate the effect of Cr/ C ratio on wear and corrosion behavior of a group of highCr white cast iron (HCCI) alloys. Three different alloys of HCCI with different chemical compositions were tested against 3.5 % NaCl, 0.5 M H 2 SO 4 , and 0.5 M NaOH solutions as corrosive media. Electrochemical polarization technique has been used to determine the corrosion current density. The microstructure characteristics of HCCI alloys were analyzed by using optical microscope, SEM, EDS, and XRD. XRD analysis reveals that the microstructure of the HCCI alloys is composed of a network of chromiumrich carbides (M 7 C 3 ) in an austenitic matrix. The abrasive wear resistance of HCCI alloys was found to be rely on their chemical composition and microstructure. The corrosion resistance of the HCCI alloys strongly depends on the Cr/C ratio and the ratio of chromium content in the M 7 C 3 carbide to that in the matrix (CrM 7 C 3 /Matrix). The experimental results of this study showed that the alloy HCCI-2 with the lower Cr/C ratio exhibited the lowest abrasive wear loss while the alloy HCCI-1 with higher Cr/ C ratio exhibited the highest abrasive wear loss. On the other hand, the HCCI-1 alloy was the most corrosion resistant and revealed the lowest current density. In addition, the corrosion current density of all specimens is elevated in 0.5 M H 2 SO 4 solution in comparison with 3.5 wt% NaCl and 0.5 M NaOH solutions.

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Section: Introductionmentioning

confidence: 99%

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

et al. 2015

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“…The cupola production technology of highstrength cast iron with nodular graphite is considered as one of the examples of production facilities allowing to utilize the wastes with high economical efficiency. This cast iron creates serious competition not only to steel, but also to substantially more expensive alloys on the base of aluminium, magnesium and titanium [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Study of aluminosilicate refractories after operation in the presence of fluorine-containing wastes

Sidorina¹,

Isagulov²,

Kashcheev³

et al. 2022

cisisr

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Samples of aluminosilicate refractory after operation in the shaft and in the hearth of a coke-gas cupola were investigated; this cupola was used for smelting of cast iron with spheroidal graphite using carbon wastes from aluminium electrolysis production as a reducing agent. Use of only fluorine-containing carbon wastes as a solid fuel in cast iron production allows to utilize hazardous man-caused wastes, improves the economic performance of production and has influence on resistance of fireclay refractories. It was established that the products acquire a distinct zone features during the service, due to penetration of the components of gas and liquid phases and the effect of low-boiling components of carbon-containing wastes. Upon that, changes in the structure along the distance from the working space are complex ones in lining thickness and in concentration of volatile components in the "cold" parts of the lining. Permanent character of the mullite content in different zones of fireclay products can be traced, as well as a slight increase in the less altered zone, despite the different service conditions. Absence of alkaline and fluoride phases in the zones of refractory products in the pores and structure of the fireclay refractory was established, due to migration of these gaseous phases into the working space of the cupola with their subsequent removal with furnace gases. Additional development of mullite in certain zones of refractory was revealed, resulting by its synthesis from alumina that did not react during fireclay refractories manufacture under the mineralizing action of a fluorine compound. Use of fluorine-containing carbonaceous wastes as a solid fuel in cast iron production makes it possible to utilize hazardous man-caused wastes, improves the economic performance of production and has slight effect on resistance of aluminosilicate refractories in the conditions of a coke-gas cupola.

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“…High-chromium complex alloyed white cast iron is one of the materials that can operate in complicated conditions; it is used in metallurgical and coke chemical industries, in mining and concentrating production, where stability of special properties in the aggressive environment at increased temperatures is required [10][11][12][13]. Its competitive market positions are based on its low production cost, absence of heat treatment and mechanical processing.…”

Section: Introductionmentioning

confidence: 99%

Influence of aluminium and niobium alloying on phase composition, structure and properties of heat- and wear-resistant cast iron of Cr-Mn-Ni-Ti system

Kolokoltsev¹,

Petrochenko²,

Molochkova³

2021

cisisr

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The paper presents the data on phase composition and structure forming for the alloys and oxide layers, on distribution of elements among the alloy structural components and oxidation surface through the depth of oxide and sub-oxide layers, on variation of wear resistance, scale resistance, growing stability and mechanical properties of cast iron of Cr-Mn-Ni-Ti-Al-Nb system depending on different aluminium and niobium content and thermal accumulating capacity of a casting mould. Complex carbides (Nb, Ti)C are forming in white cast iron during niobium alloying. Quantitative metallographic analysis of (Nb, Ti)C carbides and (Cr, Fe, Mn) 7 C 3 complex carbides was carried out on the samples with examined composition. The tests for scale resistance were conducted, structure and properties of cast iron were investigated. It was determined that chemical composition and structure of oxide layers depend on distribution of alloying elements among the alloy structural components. It was established that the areas of oxide film surface layer, which were formed on eutectics, contain mainly manganese; its concentration is more than 65 %, while Al is 4 % and Cr is 1 %. Manganese leads to increase of defects amount, such as pores, micro-cracks and vacancies, in oxide film during high-temperature gas oxidation; penetration ability of this film also increases, what has a negative effect on metal resistance to further destruction caused by oxidation. The film becomes porous, its thickness enlarges. Aluminium provides favourable influence on forming of the thin protective spinel-type films (dense substance with good metal adhesion) with minimal amount of defects; diffusion through such oxide film is very difficult. The areas of oxide layer, which were formed on austenite dendrites, contain mainly aluminium; its concentration is more than 24 %, while Mn is 16 % and Cr is 12 %. High aluminium content provides small film thickness. Joint alloying by aluminium and niobium leads to simultaneous increase of heat resistance and wear resistance. Wear resistance increased as a result of enlargement of the part of primary carbides (Nb, Ti)C with high hardness in the structure of cast iron. Composition of oxide films includes aluminium which strengthens their protective properties and rises of the alloy scale resistance. Alloying by niobium leads to secondary hardening during cooling in a casting mould. Dispersion particles of М 7 С 3 carbides are forming in solid state, thereby no structure degradation occurs during testing at increased temperatures, and growing stability rises.

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Microstructure Aspects of a Newly Developed, Low Cost, Corrosion-Resistant White Cast Iron

Cited by 11 publications

References 3 publications

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

Study of aluminosilicate refractories after operation in the presence of fluorine-containing wastes

Influence of aluminium and niobium alloying on phase composition, structure and properties of heat- and wear-resistant cast iron of Cr-Mn-Ni-Ti system

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