Is Thermal Analysis Able to Provide Carbon and Silicon Contents of Cast Irons?

Regordosa, Anna; Lacaze, Jacques; Sertucha, Jon; Castro-Roman, M. J.; Torre, Urko de la; Dezellus, Olivier

doi:10.1007/s40962-022-00799-5

Cited by 7 publications

(13 citation statements)

References 9 publications

(17 reference statements)

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“…However, nearer to 4 wt.%, the previous data suggest a steeper slope with increase in the Si content than the current work. The present results would thus be at change with respect to the predicted evolution (see Figure 1-b) while older results are in line with them [1]. This discrepancy is illustrated with figure 9b where the decreasing solid line represents the metastable austenite-cementite eutectic temperature in the Fe-C-Si system as calculated with the TCFE8 databank [10] that ends at the three-phase austenite-cementite-SC eutectic at 1074.4°C and 4.5 wt.% Si.…”

Section: Discussionsupporting

confidence: 86%

“…A regular and close evolution of the values is observed for these two cups, even for high silicon contents. In this figure are also shown the data evaluated in a previous work which was limited to 3.8 wt.% Si [1]. For silicon contents below 3.5 wt.%, the previous and current data sets agree well with each other.…”

Section: Discussionsupporting

confidence: 80%

“…The occurrence of this invariant eutectic is emphasized with the horizontal solid line in the graph. Note that this temperature for the three-phase ternary eutectic is slightly lower than the one appearing in The solid curve in Figure 9-b could be fitted by a second order polynomial of the silicon content, that was then shifted downwards by 8°C as in the previous work [1]. The temperature along the dashed line in figure 9-b that corresponds to the metastable eutectic as evaluated with a thermal analysis cup is thus given as:…”

Section: Discussionmentioning

confidence: 81%

“…From the metallographic observations presented above, it is concluded that recalescence of high-silicon alloys is related to precipitation of graphite/austenite eutectic cells and not related to the formation of a SC. In a previous study on thermal analysis of cast irons with silicon content of less than 3.8 wt.%, it was proposed that a record would still be valid for evaluating the metastable eutectic temperature if recalescence were lower than 5°C [1]. For such low recalescence values, it was understood that only a few cells of stable eutectic have nucleated and grown in the liquid ahead of the metastable eutectic front.…”

Section: Discussionmentioning

confidence: 99%

“…Thermal analysis is used as part of quality control during the preparation of the cast irons prior to mold casting and various commercial systems are available. Thermal analysis can potentially be used to estimate both carbon and silicon content as described in a previous work for eutectic and slightly hypereutectic alloys (referring to the stable system) [1].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Silicon on the Metastable Eutectic Temperature of Fe–C–Si Alloys

Torre

Sertucha

Regordosa

et al. 2023

Metall Mater Trans B

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An attempt has been made to establish experimentally the temperature along the metastable eutectic in the Fe-C-Si system, down to the invariant three phase eutectic involving austenite, cementite and an iron silico-carbide. This was carried out by standard thermal analysis using cups with a coating rich in tellurium that is known to impede graphite growth. It turned out that evaluating the metastable temperature is possible up to a silicon contents of 3.8 wt.%, beyond which the driving force for graphite growth becomes so high that the development of stable eutectic cells can no more be hindered. This is quite unfortunate for melt control on the foundry floor but triggers further study for understanding and describing graphite shape in cast irons.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Silicon on the Metastable Eutectic Temperature of Fe–C–Si Alloys

Torre

Sertucha

Regordosa

et al. 2023

Metall Mater Trans B

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Kinetic Effects on the Austenite Carbon Equivalent and Eutectic Carbon Equivalent of Silicon Cast Irons

Lacaze

2022

Inter Metalcast

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The so-called carbon equivalent of austenite liquidus (CEL) and eutectic carbon equivalent (CE) that are used in cast iron metallurgy are known as linear functions of the composition. This paper first reminds how CEL and CE expressions are obtained from the knowledge of the relevant equilibrium phase diagram, emphasizing that they are not the same quantities. To account for the observed differences between these expressions and the experimental ones, it has been proposed in the literature to add kinetic terms to the equilibrium expressions. This is first discussed by considering austenite liquidus data for cast irons with 1 wt.% to 3 wt.% silicon, from which the appropriateness of the CEL is confirmed while also evidencing the role of austenite growth undercooling. Then, experimental results on the solidification onset of near eutectic (slightly hypo-and mildly hyper-eutectic) and strongly hyper-eutectic cast irons are considered for discussing the significance of CE. For this second part, alloys that solidify in the stable system were considered whose results show again the role of austenite growth undercooling, but also that of graphite growth undercooling. The effects of addition of magnesium and of inoculation are discussed.

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Effect of Molybdenum Contents on Microstructure and High-Temperature Wear Behavior of SiMo Ductile Iron

2023

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High-silicon and molybdenum (SiMo) ductile iron is a common heat-resistant alloy that may be exposed to high-temperature wear during service in many of its applications. The wear behavior of four SiMo ductile iron alloys was evaluated at different temperatures up to 750 °C. This research focuses on the influence of various Mo contents on the microstructure, structural stability, and hence, the wear performance of such alloys. Thermodynamic calculations proposed the phase diagrams, critical transformation temperatures, and phase volume fractions in all samples by means of Thermo-Calc software. The dilatometry measurements were carried for confirming the theoretical results of Thermo-Calc thermodynamic calculations. The results revealed that the microstructure of SiMo ductile cast iron consists of nodular graphite and a ferrite matrix with carbides embedded in the fine precipitates at the grain boundary regions. The type of carbides and the nature of these fine precipitates are discussed according to EDX and SEM results. Adding molybdenum enhanced the wear performance of SiMo by decreasing the weight loss by about 40–70% compared to a Mo-free alloy. This is due to the increased molybdenum carbides, which increase hardness and improve wear resistance in SiMo alloys. The high temperatures have a negative effect on reducing the wear resistance at 250 °C. On the other hand, the wear resistance unexpectedly started to increase at higher temperatures of 500 °C and 750 °C because of the contribution of oxidative wear with abrasive wear by forming a protective oxide layer. Furthermore, the obtained results supported the idea that adding molybdenum improves wear resistance at high temperatures. Hence, SiMo has the potential to be wear-resistant material in wider applications requiring high-temperature wear resistance.

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Is Thermal Analysis Able to Provide Carbon and Silicon Contents of Cast Irons?

Cited by 7 publications

References 9 publications

Effect of Silicon on the Metastable Eutectic Temperature of Fe–C–Si Alloys

Effect of Silicon on the Metastable Eutectic Temperature of Fe–C–Si Alloys

Kinetic Effects on the Austenite Carbon Equivalent and Eutectic Carbon Equivalent of Silicon Cast Irons

Effect of Molybdenum Contents on Microstructure and High-Temperature Wear Behavior of SiMo Ductile Iron

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