Homogenization of multicomponent alloys via partial melting

Purdy, G.R.; Malakhov, Dmitri V.; Guha, A.

doi:10.1361/105497101770333009

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…Although liquid pool at higher temperature has larger size, it can be postulated that at higher temperature diffusion rate is higher which consequently different size liquid pool solidify with in the same period. The same result was expressed by Purdy et al [12]. Mn concentration in each solid mesh was calculated by solving diffusion equation numerically as follows:…”

Section: Calculation Methodsmentioning

confidence: 82%

“…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]. In this study, the process was applied on ductile iron for the first time to improve segregation problem in ductile iron.…”

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: Calculation Methodsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Homogenization of ductile iron using partial melting aided by modeling

Nili‐Ahmadabadi

Mosallaiee-Pour

2004

Materials Science and Engineering: A

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“…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. 8,12,13 Partial melting heat treatment includes heating to PMH temperature and continuing the treatment isothermally for a period of specified duration.…”

Section: Introductionmentioning

confidence: 99%

“…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 8,12,13.…”

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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“…The influence of a ternary-alloy composition on TLPB has recently been investigated. [11][12][13][14] As pointed out by Sinclair et al, [11] the usual consequence of a ternary composition is that the liquid composition must continuously change during the isothermal solidification stage of the TLP processing. This requirement impacts the rate of isothermal solidification and can result in the formation of a persistent liquid with a terminal composition (i.e., complete isothermal solidification is not achieved).…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of the compositional shift in a transient liquid phase during sintering of a ternary Cu-Sn-Bi powder mixture

D’Hondt,

Corbin

2006

Metall Mater Trans A

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In this work, differential scanning calorimetry (DSC) and microstructural analysis were used to study the transient-liquid-phase sintering (TLPS) of a Cu-Sn-Bi powder mixture. During sintering, the liquid phase shifts from a Sn-rich (i.e., ϳ90 wt pct Sn) to a Bi-rich (i.e., Ͼ78 wt pct Bi) composition. In addition, the presence of Bi creates two melting events: a Sn:Bi eutectic reaction at 139 °C and a reaction involving the melting of (Bi) at 191 °C. The Sn:Bi eutectic melting event was fully transient. The melting event at 191 °C was consistent with the formation of a terminal Bi-rich liquid phase. The rate of compositional shift toward this terminal liquid phase at 260 °C was dependent on the rate of the reaction of the Sn with the Cu powder to form intermetallic phases. For mixtures made with medium and fine Cu powder, the terminal Bi-rich composition was reached after isothermal hold times of 20 and 15 minutes, respectively. This resulted in a new melting point for the mixture of 191 °C. For coarse Cu powders, the rate of the compositional shift toward a Bi-rich composition was much slower. The liquid phase remained at a hypoeutectic Sn-Bi composition estimated at 80 wt pct Sn, while the mixture maintained a melting point of 139 °C.

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Homogenization of multicomponent alloys via partial melting

Cited by 11 publications

References 19 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

Thermal analysis of the compositional shift in a transient liquid phase during sintering of a ternary Cu-Sn-Bi powder mixture

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