Microsegregation of manganese and silicon in high manganese ductile iron

Owhadi, A.; Hedjazi, J.; Davami, P.; Fazli, M.; Shabestari, J. M.

doi:10.1179/026708397790285485

Cited by 4 publications

(10 citation statements)

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“…Microsegregation in cast irons is of importance as it affects the mechanical and chemical properties of cast iron not only directly, but also indirectly by its interplay with microstructure evolution. Negative segregation of graphitizers (Si, Al, Cu, Ni) and positive segregation of cementite stabilizers (Mn, Cr, Mo, V) is known to decrease the stable graphiteaustenite eutectic transformation temperature and promote formation of detrimental intercellular carbides in the last stage of solidification, while local impoverishment of nodularizers (Mg, Ce) may affect the graphite morphology [9][10][11][12] . High concentration gradients of specific substitutional elements such as Ni and Si have been claimed to reduce the carbon diffusion flux and thus favour detrimental chunky growth [15] .…”

Section: Introductionmentioning

confidence: 99%

3D phase-field computations of microsegregation in nodular cast iron compared to experimental data and Calphad-based Scheil-prediction

2020

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The redistribution of solute elements during processing of a nodular cast iron alloy was simulated for the first time comprehensively over time and 3D space. Numerical predictions had so far been limited to 1D models, neglecting local morphological aspects and commonly also diffusion and growth in solid-state. Application of the standard multi-phase-field method was hindered by the inherent simplifying assumption of equal and constant molar volume, causing artificial piling-up of solute and biased kinetics during modelling of graphite growth. A recently developed volumetric multi-phase-field approach now accounts for the changing partial molar volume of the individual elements. The Calphad-based phase-field study was benchmarked to experimental cooling and nodule density data, and the predicted as-cast distributions were validated by experimental segregation analysis. The combined numerical and experimental findings were furthermore used as a basis to discuss simplifying assumptions commonly made in 1D Scheil-type models.

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Section: Introductionmentioning

confidence: 99%

3D phase-field computations of microsegregation in nodular cast iron compared to experimental data and Calphad-based Scheil-prediction

2020

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“…Manganese segregates severely in inter graphite area and be in last to freeze (LTF) region [3,7,21,22]. This region is enriched with positive segregation elements such as Mn and Cr [23].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Microstructure of Heat Treated High Manganese Austenitic Cast Iron

et al. 2016

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Abstract. The effect of manganese addition and annealing heat treatment on microstructure of austenitic cast irons with high manganese content (Mn-Ni-resist) were investigated. The complex relationship between the development of the solidification microstructures and buildup of microsegregation in Mn-Ni-resist was obtained by using microstructure analysis and EDS analysis. The annealing heat treatment was applied at 700°C up to 1000°C to investigate the effect of the annealing temperature on the microstructure. This experiment describes the characterization of microsegregation in Mn-Ni-reist was made by means of point counting microanalysis along the microstructure. With this method, the differences of silicon, manganese and nickel distribution in alloys solidified in the microstructure were clearly evidenced. The results show microstructure consists of flake graphite embedded in austenitic matrix and carbides. There is segregation of elements in the Late To Freeze (LTF) region after solidification from melting. Manganese positively with high concentration detected in the LTF region. As for heat treatment, higher annealing temperature on the Mn-Ni-resist was reduced carbide formation. The higher annealing temperature shows carbide transformed into a smaller size and disperses through the austenitic matrix structure. The size of carbide decreased with increasing annealing temperature as observed in the microstructure.

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“…Using the possibilities of automatic system such as chromium and manganese, which segregate analysis, Feest et al [12] characterized the silicon segregation positively during stable solidification. Other authors [3][4][5][6][7][8][9][10] in white and gray cast irons by use of a multipoint microagree on these general features. It is worth emphasizing that probe analysis.…”

Section: Introductionmentioning

confidence: 99%

“…In this line of studies, this work presents an attempt for a long time because of their influence on the properties to describe the complex relationship between the developof cast products. [1][2][3][4][5][6][7][8][9][10][11] Microsegregations affect the microment of the solidification microstructures and buildup of structure resulting from the solidification step, namely, the microsegregation in spheroidal graphite (SG) cast irons by gray (stable) to white (metastable) eutectic transition, but coupling an experimental investigation and a modeling also the solid-state transformations during cooling or heat approach. treatments.…”

Section: Introductionmentioning

confidence: 99%

Study of microsegregation buildup during solidification of spheroidal graphite cast iron

Selig¹,

Lacaze

2000

Metall Mater Trans B

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This work presents an attempt to describe the complex relationship between the development of the solidification microstructures and buildup of microsegregation in spheroidal graphite (SG) cast irons by coupling an experimental investigation and a modeling approach. Experimental characterization of microsegregation in cast iron was made by means of point counting microanalysis along a grid. With this method, the differences of silicon distribution in alloys solidified in the stable system, the metastable system, or in both systems were clearly evidenced. The distribution of manganese in alloy solidified in the stable system was also investigated. It has been, in particular, observed that alloys solidified in the stable (respectively, metastable) system present significant negative (respectively, positive) segregation of silicon, and that alloys solidified in both systems are much less segregated. The solidification path of these alloys has been conveniently reproduced by means of predictions made with a physical model accounting for the nature of the alloy, either hypoeutectic or hypereutectic, and for the sensitivity to temperature and composition of the partition coefficient of alloying elements.

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Microsegregation of manganese and silicon in high manganese ductile iron

Cited by 4 publications

References 0 publications

3D phase-field computations of microsegregation in nodular cast iron compared to experimental data and Calphad-based Scheil-prediction

3D phase-field computations of microsegregation in nodular cast iron compared to experimental data and Calphad-based Scheil-prediction

Investigation on Microstructure of Heat Treated High Manganese Austenitic Cast Iron

Study of microsegregation buildup during solidification of spheroidal graphite cast iron

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