Microsegregation of manganese and silicon in high manganese ductile iron

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

doi:10.1179/mst.1997.13.10.813

Cited by 8 publications

(6 citation statements)

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“…The figure shows how after 5 h partial melting homogenization process; Mn and Si concentration profile is rather uniform when compared with chemical composition of the as-cast specimens. In the figure, the results of solid state homogenization at 980 • C for 10 h [8] is also added for a better comparison. The figure shows that homogenization at solid state does not effectively change alloying elements segregation while PMH process after a shorter period leads to an almost uniform alloying elements concentration.…”

Section: Resultsmentioning

confidence: 99%

“…Segregation of alloying elements has adverse effect on the mechanical properties of ductile iron and ADI [6,7]. As a consequence of non-homogenized distribution of alloying elements in ductile iron, different regions of iron has different phase diagrams, therefore, austenitization temperature varies from near nodular graphite to intercellular region [3,8]. Segregation of substitutional elements causes carbon segregation in the intercellular region after austenitization which in turn changes kinetics of austempering process in different regions and reduces heat treatment processing window [3,7].…”

Section: Introductionmentioning

confidence: 99%

“…Segregation of substitutional elements causes carbon segregation in the intercellular region after austenitization which in turn changes kinetics of austempering process in different regions and reduces heat treatment processing window [3,7]. It was shown that the conventional solid state homogenization does not effectively reduces alloying elements segregation even after a long high-temperature austenitization [8][9][10][11]. Purdy et al applied partial melting homogenization (PMH) process successfully for homogenization of NiSnCu alloys [12].…”

Section: Introductionmentioning

confidence: 99%

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Homogenization of ductile iron using partial melting aided by modeling

Nili‐Ahmadabadi

Mosallaiee-Pour

2004

Materials Science and Engineering: A

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Homogenization of ductile iron using partial melting aided by modeling

Nili‐Ahmadabadi

Mosallaiee-Pour

2004

Materials Science and Engineering: A

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“…In ductile iron, graphite promoting elements segregate around graphite nodules while carbide promoting elements segregate in the intercellular regions. [2][3][4][5][6][7][8] It has also been shown that the conventional solid state homogenisation does not effectively reduce alloying elements segregation even after a long period of high temperature austenitisation. 1,7,9,10 Purdy et al applied partial melting homogenisation (PMH) process successfully for homogenisation of NiSnCu alloys.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6][7][8] It has also been shown that the conventional solid state homogenisation does not effectively reduce alloying elements segregation even after a long period of high temperature austenitisation. 1,7,9,10 Purdy et al applied partial melting homogenisation (PMH) process successfully for homogenisation of NiSnCu alloys. 11 The same process was applied to different manganese content ductile iron, successfully homogenising the matrix with reasonable mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Development of high Mo carbide free thick section nodular cast iron by partial melting homogenisation

Rahgozar

Nili‐Ahmadabadi

Forghani

2013

Materials Science and Technology

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Sufficient hardenability is required for thick section ductile irons which are the subject of heat treatments. Molybdenum is known as one the best hardenabilty promoter elements; however, it is not common to use it in an extensive content because it segregates severely and promotes the carbide precipitation in the intercellular regions. These carbides have a detrimental effect on the mechanical properties of casting such that keeping the Mo content to a minimum as much as possible is recommended. In this study, a 1·24 pct molybdenum ductile iron which provides sufficient hardenability for about 75 mm thick section iron was used to investigate the precipitated carbides in the intercellular regions and their annihilation by partial melting homogenisation (PMH) process to get a homogenous and carbide free structure. Heating for 9 h at 1090°C was the most successful procedure to annihilate all carbides. Carbides were then extracted and subjected to scanning electron microscopy, energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, with the results showing that chemical composition of (Fe, Mo, Si)3C is of the same structure as that of Fe3C in which some iron atoms are replaced by Mo and Si. The optimum PMH treated ductile iron was austempered at 370°C for different periods after austenitising at 900°C for 2 h. The hardness tests and microstructural study by optical, scanning electron microscopy and EDS analysis revealed a carbide free and fully homogenised austempered ductile iron.

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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 8 publications

References 0 publications

Homogenization of ductile iron using partial melting aided by modeling

Homogenization of ductile iron using partial melting aided by modeling

Development of high Mo carbide free thick section nodular cast iron by partial melting homogenisation

Study of microsegregation buildup during solidification of spheroidal graphite cast iron

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