Competitive growth of stable and metastable Fe- C- X eutectics: Part I. experiments

Magnin, P; Kurz, W.

doi:10.1007/bf02645199

Cited by 47 publications

(11 citation statements)

References 5 publications

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“…In general, μ is a constant depending on the composition of the cast iron [11] through: (1) the slope of the liquidus lines; (2) the volume fraction; (3) the Gibbs-Thomson coefficients for eutectic phases; (4) the contact angles between eutectic solid phases and the liquid; and (5) the liquid diffusivity. Unfortunately, there is a lack of information in the published literature on this subject.…”

Section: The Growth Coefficient μmentioning

confidence: 99%

“…Thus, it is not possible to know the effect of the chemical composition on μ. Table 4 shows the results on the exhibited Ti for various carbon contents in the experimental melts [11]. In addition, Figure 10 shows the exhibited Q, ΔTm and NF values.…”

Section: The Growth Coefficient μmentioning

confidence: 99%

“…In the published literature, there are only a few attempts aimed at elucidating the mechanisms responsible for the chill of cast iron [3,[8][9][10][11]. Besides, none of the proposed hypotheses take into account the complexity of the solidification process.…”

Section: Introductionmentioning

confidence: 99%

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Role of Alloying Additions in the Solidification Kinetics and Resultant Chilling Tendency and Chill of Cast Iron

Fraś

López

Kawalec

et al. 2015

Metals

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The present work describes the effect of the solidification processing and alloy chemistry on the chilling tendency index, CT, and the chill, w, of wedge-shaped castings made of cast iron. In this work, theoretical predictions were experimentally verified for the role of elements, such as C, Si, Mn, P and S, on the cast iron CT. In addition, inoculation and fading effects were considered in the experimental outcome. Accordingly, the graphite nucleation coefficients, Ns, b, the eutectic cell growth coefficient, μ, and the critical cooling rate, Qcr, for the development of eutectic cementite (chill) were all determined as a function of the cast iron chemistry and time after inoculation. In particular, it was found that increasing the Mn and S contents, as well as the time after inoculation lowers the critical cooling rate, thus increasing the chilling tendency of the cast iron. In contrast, C, Si and P increase the critical cooling rate, and as a result, they reduce the cast iron CT and chill.

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Section: The Growth Coefficient μmentioning

confidence: 99%

Section: The Growth Coefficient μmentioning

confidence: 99%

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Role of Alloying Additions in the Solidification Kinetics and Resultant Chilling Tendency and Chill of Cast Iron

Fraś

López

Kawalec

et al. 2015

Metals

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“…Due to this, the effects of chemical composition and inoculation practice on the CT have been particularly addressed, both experimentally and theoretically ( [5][6][7][8][9], and references therein). Moreover, the influence of some alloying elements on the competition between the gray and white eutectics has been studied in directional solidification experiments by measuring the associated transition velocities [10,11]. A heat-transfer/microstructural model has been developed to predict the evolution of proeutectic austenite, white iron eutectic, and gray iron eutectic during solidification of hypoeutectic GCI where the phase distribution predicted with the model has been compared to the measured phase distribution inferred from the variation in hardness within the casting sample [12].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of the Gray-to-White Transition during Solidification of a Hypereutectic Gray Cast Iron: Application to a Stub-to-Carbon Connection Used in Smelting Processes

Urrutia

Celentano

Gunasegaram

2017

Metals

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This work reports on experimental and numerical results of the gray-to-white transition (GWT) during solidification of a hypereutectic gray cast iron (GCI) in a casting test using a stub-to-carbon (STC) connection assembly. Since in this process non-uniform cooling rates are produced, the mechanical properties are expected to spatially vary due to the development of different microstructures along the thimble. The twin aims of this work were to (1) experimentally validate the GWT prediction capabilities of the microstructural model proposed earlier by the authors in the rodding process of a hypereutectic GCI-STC, and (2) estimate, from the numerically obtained microstructure and ultimate tensile strength (UTS), the local hardness of the alloy after the numerical predictions of the microstructure were experimentally validated. To this end, the final microstructure at different points of the thimble and the hardness profile along its radial direction were measured for validation purposes. Moreover, this rodding process was simulated using an extension of a thermal microstructural model previously developed by the authors and the GWT was superimposed on that simulation. The computed results encompass cooling curves, the evolution of gray and white fractions, eutectic radii and densities and, in addition, the hardness profile. A detailed discussion of the experimental and numerical results is presented. Finally, the computed GWT was found to adequately reproduce the experimental data.

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“…[14][15][16] However, -Fe 3 C eutectic or dendrite + -Fe 3 C eutectic alloys have not received much attention due to extreme brittleness of the Fe 3 C phase. Recently, enhanced mechanical properties, in particular, enhanced plasticity have been reported by properly designing dendrite + eutectic composite structure in FeZr and Fe-Nb alloy systems through the following strategy, i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Addition on the Microstructural Evolution and Mechanical Properties in Hypo-Eutectic Fe-Zr(-Nb) Alloys

et al. 2010

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The effect of carbon addition on the microstructure and mechanical properties of Fe-Zr and Fe-Zr-Nb ultrafine eutectic-dendrite composites has been investigated. Addition of carbon leads to the formation of iron solid solution strengthened by carbon interstitials and carbide particles encapsulated by -Fe dendrites preferentially nucleated on the carbides. Consequently, the ultrafine eutectic Fe-5Zr-5Nb-0.3C (mass%) alloy exhibits high compressive strength ($1:2 GPa) and large plastic strain ($24%). The present study suggests another effective way to enhance the mechanical properties of Fe-based nano-eutectic alloys.

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Competitive growth of stable and metastable Fe- C- X eutectics: Part I. experiments

Cited by 47 publications

References 5 publications

Role of Alloying Additions in the Solidification Kinetics and Resultant Chilling Tendency and Chill of Cast Iron

Role of Alloying Additions in the Solidification Kinetics and Resultant Chilling Tendency and Chill of Cast Iron

Modeling and Simulation of the Gray-to-White Transition during Solidification of a Hypereutectic Gray Cast Iron: Application to a Stub-to-Carbon Connection Used in Smelting Processes

Effect of Carbon Addition on the Microstructural Evolution and Mechanical Properties in Hypo-Eutectic Fe-Zr(-Nb) Alloys

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