ENCIT 2020

18th Brazilian Congress of Thermal Sciences and Engineering

TAILORING OF TRANSIENT THERMAL PARAMETERS AND MICROSTRUCTURE VIA UPWARD SOLIDIFICATION OF THE EUTECTIC Al12.6Si ALLOY (wt.%)

Submission Author: Thiago Costa , PA
Co-Authors: Thiago Costa, Fernando Rocha, Ailton Gualdez de Oliveira , Thiago Costa, ARIELLY ASSUNÇÃO PEREIRA, Otávio Rocha
Presenter: Thiago Costa

doi://10.26678/ABCM.ENCIT2020.CIT20-0262

 

Abstract

Casting Al-Si alloys are the most widely used as cast products in the automotive industries. In this sense, to perform a thermal and microstructural analysis with the eutectic Al12.6Si alloy (wt.%), an as-cast ingot of the aforementioned alloy was obtained via transient upward solidification, using a water-cooled directional solidification device. Solidification conditions were evaluated by means of growth and cooling rates (VL and TR, respectively) and by secondary dendrite arm spacing (2). Optical microscopes have been used to characterize the microstructure and an image processing system as well as a software have been used for measurement of 2. An association between 2, VL and TR has been elaborated, and mathematical expressions of types 2=A.(VL and TR)-n have been proposed to characterize the variation of secondary dendritic spacing as a function of solidification thermal parameters. A comparison with the literature for hypoeutectic Al-Si alloys has been conducted.

Keywords

Unsteady-state horizontal solidification, Transient thermal parameters, eutectic AlSi alloy

 

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