Optimization of homogenization for a low alloyed AlMgSi alloy

Birol, Yücel

doi:10.1016/j.matchar.2013.03.013

Cited by 37 publications

(22 citation statements)

References 17 publications

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“…It is well documented that a suitable homogenization cycle may strongly facilitate the down-stream recrystallization of Al sheet [10][11][12][13][14][15][16]. The size and number density of pre-existing dispersoids can be altered by different homogenization conditions.…”

Section: Introductionmentioning

confidence: 99%

The influence of microchemistry on the softening behaviour of two cold-rolled Al–Mn–Fe–Si alloys

Huang

Wang

et al. 2014

Materials Science and Engineering: A

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Abstract:The influence of microchemistry on the softening behaviour of two cold-rolled AlMn-Fe-Si alloys with different initial amounts of Mn (0.4 and 1.0 wt%, respectively) is studied.In addition to their as-cast conditions, the supersaturated Al-Mn-Fe-Si alloys were appropriately homogenized at two different conditions, which together produce three different states of microchemistry for each alloy, i.e. solutes and second-phase particles. Samples with different microchemistry states were then cold-rolled before subsequent back-annealing at different temperatures for the two alloys. The softening and concurrent precipitation behaviours of the samples have been monitored by hardness and electrical conductivity measurements respectively, and the final microstructure in terms of grain structure and texture has been characterized by EBSD. It is clearly demonstrated that the amount of Mn and the actual microchemistry state as determined by the homogenization procedure strongly influence the softening behaviour. Both a fine dispersion of pre-existing dispersoids and strong concurrent precipitation may slow down the recrystallization kinetics considerably and give a very coarse grain structure and textures commonly associated with dispersoids effects, although some are slightly atypical.2

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Section: Introductionmentioning

confidence: 99%

The influence of microchemistry on the softening behaviour of two cold-rolled Al–Mn–Fe–Si alloys

Huang

Wang

et al. 2014

Materials Science and Engineering: A

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“…Com o aumento da rotação para 1600rpm uma produtividade maior foi atingida. Isso ocorre devido ao fato de que, mesmo que o tratamento térmico seja eficiente, solubilizando e homogeneizando as partículas na matriz de alumínio, se o resfriamento não for feito de forma adequada, as partículas anteriormente solubilizadas, serão re-precipitadas aumentando a dureza e diminuindo a ductilidade das ligas [7]. Nesse contexto pode-se observar que quanto menor a fração de precipitados maior a produtividade na extrusão.…”

Section: Efeito Da Taxa De Resfriamentounclassified

“…Se a velocidade de resfriamento for muito lenta, pode implicar na re-precipitação de compostos que já foram solubilizados na etapa anterior de homogeneização, a literatura relata que os solutos silício e magnésio são retidos na matriz de alumínio para velocidades de arrefecimento maiores que 500°C/h. Para taxas de resfriamento menores que 250°C/h a precipitação de Mg2Si é considerável e ocorre uma diminuição da dureza [7]. Neste contexto este trabalho se propôs avaliar a influência do tratamento térmico de homogeneização de resfriamento sobre a microestrutura e desempenho industrial de extrusão de uma liga de alumínio 6060.…”

Section: Introductionunclassified

Influência Do Tratamento Térmico De Homogeneização Sobre a Microestrutura E Desempenho Durante Extrusão De Uma Liga De Alumínio 6060

Pacheco¹,

Faria²,

Dias³

2018

ABM Proceedings

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ResumoDevido à carência de tarugos de alumínio 6060 com boa qualidade e baixo custo de produção no mercado de extrusão do Brasil, surge a necessidade de encontrar soluções práticas que resultem em um melhor desempenho das ligas na indústria da extrusão. Este trabalho, portanto, tem o objetivo de estudar a influência do tratamento térmico de homogeneização e da taxa de resfriamento pós-tratamento na microestrutura de uma liga de alumínio 6060, assim como as suas implicações na indústria de extrusão. Tarugos cilíndricos da liga de alumínio 6060, com diâmetro de sete polegadas, foram fabricados e submetidos a diferentes ciclos de tratamentos térmicos em um forno industrial do tipo bambury com a finalidade de dissolver e homogeneizar as partículas de segunda fase na matriz de alumínio. As variáveis de tratamento térmico investigadas neste estudo foram o tempo de residência e a taxa de resfriamento. Os tarugos termicamente tratados foram, em seguida, amostrados para caracterização microestrutural e para a execução de testes industriais de extrusão. Os resultados obtidos indicaram que existe uma significativa diferença microestrutural entre as amostras, que consistiu principalmente na variação das frações de precipitados de Mg 2 Si na matriz. Foi possível concluir que a produtividade na extrusão depende fortemente da fração desses precipitados. Palavras-chave: Ligas de alumínio 6060; Tratamento térmico de homogeneização; Taxa de resfriamento; Extrusão. INFLUENCE OF HOMOGENIZATION HEAT TREATMENT ON MICROSTRUCTURE AND PERFORMANCE DURING EXTRUSION OF AN ALUMINUM ALLOY 6060 AbstractDue to the low availability of aluminum billet 6060 with good quality and low production cost in Brazil market extrusion, there is a need to find practical solutions that result in improvements in extrusion performance of this alloy. This work aims to study the influence of the homogenization heat treatment on microstructure of an aluminum alloy 6060 as well its implications in the extrusion industry. Cylindrical billets of aluminum alloy 6060 with seven inch diameter were manufactured and submitted to different cycles of heat treatment in an industrial Bambury furnace in order to dissolve and redistribute the second phase particles in the aluminum matrix. The evaluated heat treatment parameters were the residence time and cooling rate. The heat-treated billets were then sampled for microstructural characterization and extrusion testing in an industrial scale. The results indicated that there is a significant difference between the microstructural samples, consisted mainly on the variation of Mg 2 Si precipitates fractions in the matrix. It was concluded that productivity in extrusion strongly depends on the fraction of these precipitates.

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“…[9] A thick shell zone can affect the surface quality of the extruded products. [10] An as-cast billet should have minimum surface segregation and shell zone in addition to fine secondary phases, fine grains, and cells which are uniformly distributed. [6] If the surface zone is of unacceptable quality scalping of the outer layer is necessary, however, this is a costly treatment and needs to be avoided unless especially strong demands are set on the billet quality.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on the Surface Structure of 6082 Al Alloys

Bayat

Carlberg

2017

Metall Mater Trans A

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The b-Al 5 FeSi intermetallic phase and coarse Mg 2 Si particles have negative effects on extrudability and workability of 6xxx Al alloys billets. To achieve extruded products with a high surface quality, the as-cast billets are heat-treated before extrusion. During heat treatment, the undesired intermetallic particles, i.e., b-AlFeSi platelets are transformed to rounded a-Al(FeMn)Si intermetallic phases. Although the heat treatment of the bulk areas of the 6xxx Al alloys has been the focus of many previous studies, the process of phase transformation at the very surface has not been paid the same attention. In this study, microstructures of a homogenized billet of a 6082 alloy at the area very close to the surface were investigated. By comparing the X-ray diffraction patterns (XRD) of heat-treated samples as a function of different holding times, the gradual phase transformations could be followed, and using GDOES and map analysis by EDX, the alloying elemental redistribution was analyzed. Partial remelting and porosity growth was detected, and transformation rates were faster than in bulk material and from what is known from industrial processes.

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Optimization of homogenization for a low alloyed AlMgSi alloy

Cited by 37 publications

References 17 publications

The influence of microchemistry on the softening behaviour of two cold-rolled Al–Mn–Fe–Si alloys

The influence of microchemistry on the softening behaviour of two cold-rolled Al–Mn–Fe–Si alloys

Influência Do Tratamento Térmico De Homogeneização Sobre a Microestrutura E Desempenho Durante Extrusão De Uma Liga De Alumínio 6060

Influence of Heat Treatment on the Surface Structure of 6082 Al Alloys

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