Predicting dendrite arm spacing and their effect on microporosity formation in directionally solidified Al-Cu alloy

Melo, Mírian de Lourdes Noronha Motta; Rizzo, E.M.S.; Santos, Rogério Gonçalves dos

doi:10.1007/s10853-005-0659-y

Cited by 40 publications

(30 citation statements)

References 40 publications

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“…The results indicate that the heat transfer coefficients obtained by cooled mold are much larger, stabilizing at values around of 3000W m -2 K (MELO et al, 2005).…”

Section: Heat Transfer Coefficient In the Metal/mold Interfacementioning

confidence: 92%

“…The determination of heat transfer coefficient in the metal/mold interface was done using the experimental temperature at different positions in the metal and the mold inserted into a numerical model which simulates the solidification process in a cylindrical mold. For this, we used a model developed by Melo et al (2005). Figure 3 shows the results obtained for the variation of heat transfer coefficient in the metal/mold interface.…”

Section: Heat Transfer Coefficient In the Metal/mold Interfacementioning

confidence: 99%

“…analysis of solidification in cylindrical molds is complex due to heat flow which causes a divergent solidification front circular converging to a central point ( SOUZA et al, 2005a and b;SANTOS et al, 2001). During solidification with the formation of the gap of this air interface, the heat transfer coefficient can rapidly decrease, making the removal of heat and slowing down the solidification process of the liquid metal.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of microstructure has been the subject of several studies of many researchers including Melo et al (2005) who studied the effects of secondary dendrite spacing in the formation of microporosity in Al-Cu alloy, where the variation of dendrite spacing during solidification was determined using the variations in temperature, the speed of advance of the tip of the dendrite, the local solidification time and the thermal gradient from front dendritic obtained by numerical model (MELO et al, 2007;SOUZA et al, 2005a).…”

Section: Introductionmentioning

confidence: 99%

“…Several other researchers via the solidification metals, studied the microstructures resulting from unidirectional solidification radial and under the most diverse geometries, temperature conditions and chemical compositions (GÜNDÜZ;ÇARDILI, 2002;SANTOS et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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A Comparative study of solidification of Al-Cu alloy under flow of cylindrical radial heat and the unidirectional vertically

et al. 2014

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ABSTRACT. In spite of technological importance of solidification of metallic alloys under radial heat flow, relatively few studies have been carried out in this area. In this work the solidification of Al 4.5 wt% Cu cylinders against a steel massive mold is analyzed and compared with unidirectional solidification against a cooled mold. Initially temperature variations at different positions in the casting and in the mold were measured during solidification using a data acquisition system. These temperature variations were introduced in a numerical method in order to determine the variation of heat transfer coefficient at metal/mold interface by inverse method. The primary and secondary dendrite arm spacing variations were measured through optical microscopy. Comparisons carried out between experimental and numerical data showed that the numerical method describes well the solidification processes under radial heat flux.Keywords: unidirectional solidification, radial heat flow, heat transfer coefficient, aluminum alloy.Estudo comparativo da solidificação da liga Al-Cu sob fluxo de calor radial cilíndrico e unidirecional ascendente RESUMO. A despeito da importância tecnológica da solidificação de ligas metálicas sob fluxo de calor radial, relativamente poucos estudos estão sendo realizados nessa área. Neste trabalho, a solidificação da liga Al-4,5%Cu em molde de aço radial cilíndrico é analisada e comparada com a solidificação unidirecional em molde resfriado. Inicialmente, a variação de temperatura em diferentes posições no metal e no molde foram medidas durante a solidificação usando um sistema de aquisição de dados. Essas variações de temperatura foram introduzidas num método numérico para determinar a variação do coeficiente de transferência de calor na interface metal/molde pelo método inverso. Os espaçamentos interdendríticos são determinados a partir das micrografias. Comparações entre variações e temperaturas calculadas numéricas e experimentalmente comprovaram que o método numérico descreve satisfatoriamente o processo de solidificação.Palavras-chave: solidificação unidirecional, fluxo de calor radial, coeficiente de transferência de calor, ligas alumínio.

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“…The results indicate that the heat transfer coefficients obtained by cooled mold are much larger, stabilizing at values around of 3000W m -2 K (MELO et al, 2005).…”

Section: Heat Transfer Coefficient In the Metal/mold Interfacementioning

confidence: 92%

Section: Heat Transfer Coefficient In the Metal/mold Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Comparative study of solidification of Al-Cu alloy under flow of cylindrical radial heat and the unidirectional vertically

et al. 2014

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Numerical and experimental analysis of microstructure formation during stainless steels solidification

et al. 2007

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The aim of this work is to examine microstructure formation during the solidification of unidirectional solidified AISI 304 stainless steel. Numerical and experimental results indicate that this numerical model allows a precise analysis of the AISI 304 stainless steel microstructure formation. This model determines temperature profiles, position of liquid and solid isotherms, thermal parameters (thermal gradients, tip rate movement, rate cooling), and finally, the secondary inter dendritic spacing. This model was tested by comparing the experimental values results, and thus a reasonable correlation was found.

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On the influence of carbon on secondary dendrite arm spacing in steel

Pierer¹,

Bernhard²

2008

J Mater Sci

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Predicting dendrite arm spacing and their effect on microporosity formation in directionally solidified Al-Cu alloy

Cited by 40 publications

References 40 publications

A Comparative study of solidification of Al-Cu alloy under flow of cylindrical radial heat and the unidirectional vertically

A Comparative study of solidification of Al-Cu alloy under flow of cylindrical radial heat and the unidirectional vertically

Numerical and experimental analysis of microstructure formation during stainless steels solidification

On the influence of carbon on secondary dendrite arm spacing in steel

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