Microstructural refinement of 355 aluminium alloys by ultrasonic melt treatment (UST)
Leandro Cassio de Paula, Eugenio Jose Zoqui
ARTIGO
Inglês
Agradecimentos: The authors would like to thank the Brazilian research funding agencies FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo—Project 2015/22143-3), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico—PQ 304921/2017-3) and CAPES (Coordenação de Aperfeiçoamento...
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Agradecimentos: The authors would like to thank the Brazilian research funding agencies FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo—Project 2015/22143-3), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico—PQ 304921/2017-3) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001) for providing financial support for this study. The authors are also indebted to the Faculty of Mechanical Engineering at the University of Campinas and Sonitron Ultra Sônica Ltda;FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo—Project 2015/22143-3; CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico—PQ 304921/2017-3 and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001
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Chemical grain refining of high-silicon-content aluminium alloys, such as 355 alloy, is impaired by the high silicon content. One solution is the use of ultrasonic melt treatment (UST). This study sought to determine the duration of UST and type of horn (steel or Ti) required to achieve optimal...
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Chemical grain refining of high-silicon-content aluminium alloys, such as 355 alloy, is impaired by the high silicon content. One solution is the use of ultrasonic melt treatment (UST). This study sought to determine the duration of UST and type of horn (steel or Ti) required to achieve optimal grain refining in these alloys. Samples produced by conventional casting underwent UST for different times with steel and Ti horns and were compared with as-cast samples. For all the conditions studied, analysis of the samples showed that UST is an effective grain refining technique and yields satisfactory values of average grain size and primary and secondary dendrite arm spacing (lambda(1), lambda(2)) as well as low porosity. The chemical composition of the samples was analysed by SEM-EDS mapping and point analysis to identify the intermetallic phases before and after UST. Best results were achieved after only 20 s of UST with a steel horn. UST for this length of time with a steel horn produced a homogeneous microstructure and possible homogeneous mechanical properties. Grain size was 160 mu m; primary dendrite arm spacing, or dendrite cell size, was 130 mu m; secondary arm spacing was approximately 18 mu m; and Vickers hardness was approximately 95 HV
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FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2015/22143-3
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
304921/2017-3
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
001
Fechado
Microstructural refinement of 355 aluminium alloys by ultrasonic melt treatment (UST)
Leandro Cassio de Paula, Eugenio Jose Zoqui
Microstructural refinement of 355 aluminium alloys by ultrasonic melt treatment (UST)
Leandro Cassio de Paula, Eugenio Jose Zoqui
Fontes
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SN applied sciences Vol. 1, no. 5 (May, 2019), n. art. 394 |