Publicación: Desenvolvimento de Tratamentos Térmicos para Peças Estruturais Injetadas em Ligas de Alumínio
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2024-10-22
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info:eu-repo/semantics/openAccess
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http://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
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Universidad Nacional de Educación a Distancia (España), Universidad de Concepción - Chile. Departamento de Ingeniería Mecánica
Resumen
Com o intuito de minimizar o peso dos veículos, cada vez mais são utlizadas peças em ligas de alumínio produzidas por fundição injetada. Contudo, devido às elevadas velocidades de injeção durante o processo de HPDC, ar fica aprisionado no metal líquido, originando porosidades nos componentes. Estas porosidades gasosas impossibilitam a realização de tratamentos térmicos devido ao fenómeno de “blistering”. Assim, o trabalho realizado centra-se no desenvolvimento de tratamentos térmicos (T5 e T6 relâmpago) em peças obtidas pelo processo de HPDC assistido por vácuo, recorrendo às ligas AlSi10MnMg e AlSi10Mg(Fe). As peças foram caracterizadas tendo em consideração a ocorrência de “blistering”, microestrutura e propriedades mecânicas alcançadas. Adicionalmente, foi avaliada a maquinabilidade da liga primária AlSi10MnMg, recorrendo a uma ferramenta com PCD produzida por fabrico aditivo, sendo esta comparada com a da liga convencional AlSi9Cu3(Fe). Para todas as combinações de parâmetros usadas no tratamento térmico de solubilização verificaram-se “blisters” nos componentes. Com o tratamento térmico T5 não houve formação de “blisters” e a resistência mecânica aumentou. Em termos de maquinabilidade da liga primária AlSi10MnMg, esta apresenta uma rugosidade superficial ligeiramente superior e forças de corte inferiores, comparativamente à liga de injeção convencional AlSi9Cu3(Fe).
In order to minimise the weight of vehicles, aluminium alloy parts produced by high pressure die casting are increasingly being used. However, due to the high injection speeds during the HPDC process, air is trapped in the liquid metal, causing porosity in the components. These gas porosities make it impossible to carry out heat treatments due to the blistering phenomenon. The work carried out therefore centres on the development of heat treatments (T5 and flash T6) on parts obtained by the vacuum-assisted HPDC process, using AlSi10MnMg and AlSi10Mg(Fe) alloys. The parts were characterised taking into account the occurrence of blistering, microstructure and mechanical properties achieved. In addition, the machinability of the AlSi10MnMg primary alloy was assessed using a PCD tool produced by additive manufacturing and compared with the one of AlSi9Cu3(Fe) conventional alloy. For all combinations of parameters used in the solution heat treatment, there were blisters in the components. With the T5 heat treatment there was no blistering and the mechanical strength increased. In terms of the machinability of the AlSi10MnMg primary alloy, it exhibits slightly higher surface roughness and lower cutting forces compared to the conventional AlSi9Cu3(Fe) injection alloy.
In order to minimise the weight of vehicles, aluminium alloy parts produced by high pressure die casting are increasingly being used. However, due to the high injection speeds during the HPDC process, air is trapped in the liquid metal, causing porosity in the components. These gas porosities make it impossible to carry out heat treatments due to the blistering phenomenon. The work carried out therefore centres on the development of heat treatments (T5 and flash T6) on parts obtained by the vacuum-assisted HPDC process, using AlSi10MnMg and AlSi10Mg(Fe) alloys. The parts were characterised taking into account the occurrence of blistering, microstructure and mechanical properties achieved. In addition, the machinability of the AlSi10MnMg primary alloy was assessed using a PCD tool produced by additive manufacturing and compared with the one of AlSi9Cu3(Fe) conventional alloy. For all combinations of parameters used in the solution heat treatment, there were blisters in the components. With the T5 heat treatment there was no blistering and the mechanical strength increased. In terms of the machinability of the AlSi10MnMg primary alloy, it exhibits slightly higher surface roughness and lower cutting forces compared to the conventional AlSi9Cu3(Fe) injection alloy.
Descripción
Organizado y patrocinado por: Federación iberoamericana de Ingeniería Mecánica y 'Universidad de Concepción - Chile. Departamento de Mecánica', FeIbIm – FeIbEM
Categorías UNESCO
Palabras clave
Fundição injetada (HPDC), Ligas de alumínio, Tratamentos térmicos, Maquinagem, High-pressure die casting (HPDC), Aluminium alloys, Heat treatments, Machining
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Centro
E.T.S. de Ingenieros Industriales
Departamento
Mecánica