Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified

This study aims to correlate the influence of thermal and microstructural parameters such as growth rate and cooling rate (VL and TR) and secondary dendrite spacing (λ2), respectively, in the machining cutting temperature and tool wear on the necking process of the Al–7 wt.% Si alloy solidified in a...

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Main Authors:	Cássio A. P. Silva, Layo R. M. Leal, Emanuelle C. Guimarães, Paulo M. Júnior, Antonio L. Moreira, Otávio L. Rocha, Adrina P. Silva
Format:	Article
Language:	English
Published:	Hindawi Limited 2018-01-01
Series:	Advances in Materials Science and Engineering
Online Access:	http://dx.doi.org/10.1155/2018/9512957

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spelling	doaj-082bea3825c145c0ab60ecfd151596352020-11-24T22:49:56ZengHindawi LimitedAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/95129579512957Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally SolidifiedCássio A. P. Silva0Layo R. M. Leal1Emanuelle C. Guimarães2Paulo M. Júnior3Antonio L. Moreira4Otávio L. Rocha5Adrina P. Silva6Federal University of Pará, Augusto Correa Avenue 01, P.O. Box 479, Belém, PA, BrazilFederal University of Pará, Augusto Correa Avenue 01, P.O. Box 479, Belém, PA, BrazilFederal University of Pará, Augusto Correa Avenue 01, P.O. Box 479, Belém, PA, BrazilFederal University of Pará, Augusto Correa Avenue 01, P.O. Box 479, Belém, PA, BrazilFederal University of Pará, Augusto Correa Avenue 01, P.O. Box 479, Belém, PA, BrazilFederal Institute of Education, Science and Technology of Pará, Almirante Barroso Avenue 1155, P.O. Box 66093-020, Belém, PA, BrazilFederal University of Pará, Augusto Correa Avenue 01, P.O. Box 479, Belém, PA, BrazilThis study aims to correlate the influence of thermal and microstructural parameters such as growth rate and cooling rate (VL and TR) and secondary dendrite spacing (λ2), respectively, in the machining cutting temperature and tool wear on the necking process of the Al–7 wt.% Si alloy solidified in a horizontal directional device using a high-speed steel with a tungsten tool. The dependence of λ2 on VL and TR and dependence of the maximum cutting temperature and maximum flank wear on λ2 were determined by power experimental laws given by λ2 = constant (VL and TR)n and TMAX, VBMAX = constant (λ2)n, respectively. The maximum cutting temperature increased with increasing of λ2. The opposite occurred with the maximum flank wear. The role of Si alloying element on the aforementioned results has also been analyzed. A morphological change of Si along the solidified ingot length has been observed, that is, the morphology of Si in the eutectic matrix has indicated a transition from particles to fibers along the casting together with an increase of the particle diameters with the position from the metal/mold interface.http://dx.doi.org/10.1155/2018/9512957
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Cássio A. P. Silva Layo R. M. Leal Emanuelle C. Guimarães Paulo M. Júnior Antonio L. Moreira Otávio L. Rocha Adrina P. Silva
spellingShingle	Cássio A. P. Silva Layo R. M. Leal Emanuelle C. Guimarães Paulo M. Júnior Antonio L. Moreira Otávio L. Rocha Adrina P. Silva Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified Advances in Materials Science and Engineering
author_facet	Cássio A. P. Silva Layo R. M. Leal Emanuelle C. Guimarães Paulo M. Júnior Antonio L. Moreira Otávio L. Rocha Adrina P. Silva
author_sort	Cássio A. P. Silva
title	Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified
title_short	Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified
title_full	Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified
title_fullStr	Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified
title_full_unstemmed	Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified
title_sort	influence of thermal parameters, microstructure, and morphology of si on machinability of an al–7.0 wt.% si alloy directionally solidified
publisher	Hindawi Limited
series	Advances in Materials Science and Engineering
issn	1687-8434 1687-8442
publishDate	2018-01-01
description	This study aims to correlate the influence of thermal and microstructural parameters such as growth rate and cooling rate (VL and TR) and secondary dendrite spacing (λ2), respectively, in the machining cutting temperature and tool wear on the necking process of the Al–7 wt.% Si alloy solidified in a horizontal directional device using a high-speed steel with a tungsten tool. The dependence of λ2 on VL and TR and dependence of the maximum cutting temperature and maximum flank wear on λ2 were determined by power experimental laws given by λ2 = constant (VL and TR)n and TMAX, VBMAX = constant (λ2)n, respectively. The maximum cutting temperature increased with increasing of λ2. The opposite occurred with the maximum flank wear. The role of Si alloying element on the aforementioned results has also been analyzed. A morphological change of Si along the solidified ingot length has been observed, that is, the morphology of Si in the eutectic matrix has indicated a transition from particles to fibers along the casting together with an increase of the particle diameters with the position from the metal/mold interface.
url	http://dx.doi.org/10.1155/2018/9512957
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Influence of Thermal Parameters, Microstructure, and Morphology of Si on Machinability of an Al–7.0 wt.% Si Alloy Directionally Solidified

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