Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
INFLUENCE OF PRESSURE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ALLOY AL-0.35% SI-0.40% MG MANUFACTURED BY SQUEEZE CASTING PROCESS
Submission Author:
Regina Bernardo , PB
Co-Authors:
Diego Lima, Fernando Araujo, Ronaldo Marques, Claudio Siqueira, Regina Bernardo
Presenter: Regina Bernardo
doi://10.26678/ABCM.COBEM2017.COB17-1302
Abstract
In the "Squeeze Casting" process the liquid metal is placed in a mold and subjected to a permanent pressure, applied through a hydraulic press, until complete solidification. The high pressure used in the process refines the microstructure, which results in an improvement of the mechanical properties in general. In addition, parts that are solidified through this technique present superior weldability, better surface finish, better responses to the heat treatment, among other benefits. The present work aims to analyze the influence of pressure on the microstructure and mechanical properties (Vickers microhardness) of the alloy. For this purpose, the composition adopted was Al-0.35% Si-0.40% Mg, solidified by the squeeze casting process using pressures of 0 MPa, 50 MPa, 100 MPa and 150 MPa, with pressing time of 5 Seconds. It was generally observed that with increasing pressure the microstructure suffered a decrease in the secondary dendritic spacing which resulted in an increase in microhardness values.
Keywords
squeeze casting, Microhardness, Microstructure
