Quantitative analysis of the effect of inoculation and magnesium content on compact graphite irons — Experimental approach

Regordosa, Anna; Torre, Urko de la; Sertucha, Jon; Lacaze, Jacques

doi:10.1016/j.jmrt.2020.08.008

Cited by 11 publications

(37 citation statements)

References 12 publications

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“…2. The experimental results 17) suggest that there is little or no further nucleation of graphite during this stage, so that the number of CG cells could be fixed as the nodule count reached at the end of primary deposition. The equations describing the eutectic reaction in appendix C have been derived for single sized primary graphite, i.e.…”

Section: Physical Modellingmentioning

confidence: 96%

“…Figure 2 shows the isopleth Fe-C section at 3.65 mass% C, 0.83 mass% Cu, 0.62 mass% Mn and 2.39 mass% Si, that is representative of the final composition of the experimental alloys. The data used to draw this section have been detailed previously 17) and are summarized in appendix A. This isopleth section shows the stable diagram in solid lines with their metastable extrapolation drawn with interrupted lines.…”

Section: Physical Modellingmentioning

confidence: 99%

“…The experiments considered here have been fully described previously 17) and are only shortly presented below. A 4 ton melt prepared for casting spheroidal graphite cast iron was maintained for 8 hours under nitrogen so that the spheroidizing treatment faded slowly leading to precipitation of compacted graphite.…”

Section: Preliminary Calculationsmentioning

confidence: 99%

“…Calculations accounted for the slight changes in alloy composition and T peak from one alloy to the other which are listed in full in the previous work. 17) Hence, the only parameter that was left for describing solidification was the nucleation constant A 1 .…”

Section: Preliminary Calculationsmentioning

confidence: 99%

“…14,15) Based on the above view of CGI solidification, a physical model of solidification of CGI is described for the case of hypereutectic composition. This model is then applied to experimental results on non-inoculated alloys which have been detailed previously 16,17) and relate to solidification in small thermal analysis cups.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Analysis of Solidification of Compacted Graphite Irons – A Modelling Approach

et al. 2021

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Several X-ray topography studies which have appeared recently in the literature show compacted graphite in cast iron consisting of coarse interconnected graphite lamellas. This suggested that solidification of these alloys could be described as done for irregular eutectics by accounting for limited branching of graphite lamellas. The corresponding growth law has been inserted in appropriate mass balances for describing the successive solidification stages. Predictions of the model thus obtained have been compared to quantitative experimental information previously gained on solidification of a series of hypereutectic alloys. The deep undercooling and marked recalescence which are so characteristic of the solidification of compacted graphite cast irons in the stable system are reproduced and appear to be closely related to the limited branching of graphite lamellas in the compacted graphite cells. The competition between stable and metastable solidification could be described and leads to a decrease of the recalescence amplitude that was properly reproduced.

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Section: Physical Modellingmentioning

confidence: 96%

Section: Physical Modellingmentioning

confidence: 99%

Section: Preliminary Calculationsmentioning

confidence: 99%

Section: Preliminary Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantitative Analysis of Solidification of Compacted Graphite Irons – A Modelling Approach

et al. 2021

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When is a Cast Iron Eutectic?

et al. 2021

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Literature often mentions that cast irons that appear eutectic by thermal analysis are hypereutectic if one refers to the equilibrium phase diagram. This is a source of ambiguity and confusion. The analysis of experimental results on hypereutectic cast irons has previously shown that taking into account the solidification path during the primary precipitation of graphite makes it possible to differentiate slightly hypereutectic cast irons from very hypereutectic cast irons. This approach is applied here to a cast iron which appears eutectic when inoculated and hypoeutectic when not. Thus, it is confirmed that graphite growth only becomes effective when a minimal undercooling is reached, independently of inoculation.However, only an alloy with a carbon equivalent at the boundary between mildly and strongly hypereutectic alloys and which is inoculated can appear eutectic by thermal analysis.

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Analysis of the Rationale and Accuracy of the use of Carbon Equivalent and Thermal Analysis in the Quality Control of Cast Iron

Stefanescu

2021

Inter Metalcast

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Quantitative analysis of the effect of inoculation and magnesium content on compact graphite irons — Experimental approach

Cited by 11 publications

References 12 publications

Quantitative Analysis of Solidification of Compacted Graphite Irons – A Modelling Approach

Quantitative Analysis of Solidification of Compacted Graphite Irons – A Modelling Approach

When is a Cast Iron Eutectic?

Analysis of the Rationale and Accuracy of the use of Carbon Equivalent and Thermal Analysis in the Quality Control of Cast Iron

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