Improvement of tensile strength and corrosion resistance of high-silicon cast irons by optimizing casting process parameters

Kim, B. H.; Shin, Ju Hyun; Lee, S. M.; Moon, B.M.

doi:10.1007/s10853-006-1081-9

Cited by 13 publications

(16 citation statements)

References 4 publications

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“…While Fe-high chromium alloys have at least 11.5% of Cr for good corrosion resistance, in Fe-high silicon alloys, the best compositions were noticed around 15% of silicon 12 . However, one of the reasons to avoid the high use of silicon in iron based alloys is related to the embrittlement generated 13,14 . Rare earths, like cerium and yttrium, are also used to improve oxidation resistance in Fe-based alloys [15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Kinetics Oxidation and Characterization of Cyclically Oxidized Layers at High Temperatures for FeMnSiCrNiCe and FeSiCrNi Alloys

et al. 2017

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Conventional stainless steels are used in cyclic oxidation, but the high amount of Cr and mainly Ni increase the price of these alloys. The objective of the present study was to assess the cyclic oxidation resistance of FeSiCrNi and FeMnSiCrNiCe alloys in comparison to AISI 304 and AISI 310 stainless steels by evaluating the oxidation kinetics and using characterization techniques to determine the oxides formed. The alloys were melted in induction furnaces and cast in sand molds. Cyclic oxidation tests were carried out in an automated oven in cycles of one hour for heating and maintenance at high temperature (850, 950 or 1050 ºC) and 10 minutes for cooling. To characterize the oxidized layers, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS) analysis were performed. The oxidation kinetics were determined. The results showed that the studied alloys presented better results than AISI 304 at 850 ºC, but at 1050 ºC, AISI 310 presented the best results. At 950 ºC, the FeSiCrNi alloy presented layer detachment and FeMnSiCrNiCe presented a higher rate of mass variation than AISI 310, both without oxide detachment. For both alloys, formation of chromium and manganese oxides with parabolic rate of mass gain occurred.

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Section: Introductionmentioning

confidence: 99%

Kinetics Oxidation and Characterization of Cyclically Oxidized Layers at High Temperatures for FeMnSiCrNiCe and FeSiCrNi Alloys

et al. 2017

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“…Aço HH. 1993); e a liga com silício, mais conhecida pela resistência à corrosão em meios ácidos, apresenta fragilidade inerente à matriz, dado o alto teor de silício (KIM et al, 2007, e CASTRO, et al, 2011. Ainda assim, considerou-se viável o estudo, dado o baixo custo das ligas.…”

Section: Artur Mariano De Sousa Malafaiaunclassified

Oxidação cíclica em alta temperatura de ligas ferrosas fundidas de baixo custo

Malafaia¹

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“…Titanium is added to the gray cast iron to increase strength and improve wear resistance, due to the friction coefficient decrease caused and the presence of hard titanium carbides (Ref 14,15). Molybdenum is used in high-silicon cast iron to allow corrosion resistance in environments of hydrochloric and hydrofluoric acids ( Ref 1,2,4,6,8,9). However, regarding nitric acid, molybdenum does not present any improvement, sometimes causing a decrease in the corrosion resistance (Ref 10).…”

Section: The Increase In the Carbon Level Decreases The Tensile Strenmentioning

confidence: 99%

“…High-silicon cast irons are basically ternary Fe-C-Si alloys recommended for applications to which high corrosion resistance is required (Ref [1][2][3][4][5][6][7][8][9][10]. Such characteristic is achieved due to the formation of a protective coating of hydrated silicon oxide on the materialÕs surface (Ref 1).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Annealing Heat Treatment and Cr, Mg, and Ti Alloying on the Mechanical Properties of High-Silicon Cast Iron

Castro

Rossino

Malafaia

et al. 2010

J. of Materi Eng and Perform

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The influence of annealing on the mechanical properties of high-silicon cast iron for three alloys with distinct chromium levels was investigated. Each alloy was melted either with or without the addition of Ti and Mg. These changes in the chemical composition and heat treatment aimed to improve the materialÕs mechanical properties by inhibiting the formation of large columnar crystals, netlike laminae, precipitation of coarse packs of graphite, changing the length and morphology of graphite, and rounding the extremities of the flakes to minimize the stress concentration. For alloys with 0.07 wt.% Cr, the annealing reduced the impact resistance and tensile strength due to an enhanced precipitation of refined carbides and the formation of interdendritic complex nets. Annealing the alloys containing Ti and Mg led to a decrease in the mechanical strength and an increase in the toughness. Alloys containing approximately 2 wt.% Cr achieved better mechanical properties as compared to the original alloy. However, with the addition of Ti and Mg to alloys containing 2% Cr, the chromium carbide formation was inhibited, impairing the mechanical properties. In the third alloy, with 3.5 wt.% of Cr additions, the mechanical strength improved. The annealing promoted a decrease in both hardness and amount of iron and silicon complex carbides. However, it led to a chromium carbide formation, which influenced the mechanical characteristics of the matrix of the studied material.

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Improvement of tensile strength and corrosion resistance of high-silicon cast irons by optimizing casting process parameters

Cited by 13 publications

References 4 publications

Kinetics Oxidation and Characterization of Cyclically Oxidized Layers at High Temperatures for FeMnSiCrNiCe and FeSiCrNi Alloys

Kinetics Oxidation and Characterization of Cyclically Oxidized Layers at High Temperatures for FeMnSiCrNiCe and FeSiCrNi Alloys

Oxidação cíclica em alta temperatura de ligas ferrosas fundidas de baixo custo

Influence of Annealing Heat Treatment and Cr, Mg, and Ti Alloying on the Mechanical Properties of High-Silicon Cast Iron

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