Some Behaviors and Characteristics of Decarburized Layer in Spheroidal Graphite Cast Iron

Yamada, S.; Konno, Toshiyuki; Goto, Shoji; Aso, Setsuo; Komatsu, Yoshinari

doi:10.5188/ijsmer.10.88

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…While it remains unclear if carbon oxidation takes place at the metal-oxide interface, in the oxide scale or at the oxide-gas interface, elemental carbon or the gaseous carbon oxide resulting from carbon oxidation has to diffuse through the oxide scale for decarburization to keep proceeding. This phenomenon has been observed above 700°C for low-Si cast-iron [13] and above 800°C for Hi-Si SGI [14], and its rate increases with temperature. The interaction between oxidation and decarburisation are two-fold: on the one hand, decarburisation affects the oxide morphology and the oxidation rate, as reported by Lekakh et al [10,11]; on the other hand, the formation of oxides could limit the decarburisation rate assuming that Si-rich oxides also act as an effective diffusion barrier for carbon.…”

Section: Introductionmentioning

confidence: 68%

Cyclic oxidation of high-silicon spheroidal graphite iron

et al. 2021

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Section: Introductionmentioning

confidence: 68%

Cyclic oxidation of high-silicon spheroidal graphite iron

et al. 2021

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“…The higher proportion of ferrite in these samples when compared to the original microstructure indicates the 5 h the samples have been soaked at 880 • C had a ferritizing effect, resulting in the partial conversion of the pearlitic cementite to ferrite and graphite. Furthermore, a partial decarburization process took place at the surface of the samples due to the high temperature of the oven [28], as can be seen at the lower-left part of Figure 4 as round areas corresponding to the decarburized graphite nodules (DGN). In this case, the combination of ferrite and martensite gave the quenched samples a hardness of 42 ± 3 HRC (420 HV).…”

Section: Microstructure and Hardness After Quenchingmentioning

confidence: 99%

Hardness Prediction in Quenched and Tempered Nodular Cast Iron Using the Hollomon-Jaffe Parameter

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Carrasco

Antoni

et al. 2021

Metals

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The Hollomon-Jaffe parameter is usually used to stablish a equivalence between time and temperature in a tempering treatment, but not to predict the harness of the alloy after the treatment. In this paper this last possibility has been studied. A group of cast iron samples was annealed and cooled at different rates in order to obtain samples with three different hardness values. These samples were tempered using different times and temperatures. The Hollomon-Jaffe parameter was calculated for each case and a relationship based on a logistic function between that parameter and the final hardness was stablished. This relationship was found to depend on the initial hardness and the lowest hardness achievable.

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“…As for the disappearance process of the graphite particles, the following steps are thought: The carbon atoms dissolve into the (5) Therefore, the value of Pco/Pco2 in the atmosphere of steel pot can be calculated from equation (5). The calculated values are shown in Fig.…”

Section: Decarburized Layermentioning

confidence: 99%