Solidification thermal parameters and dendritic growth during the horizontal directional solidification of Al-7wt.%Si alloy

Rem: Revista Escola de Minas

Diego De Leon Brito Carvalho²  Thiago Antônio Paixão De Sousa Costa¹  Antonio Luciano Seabra Moreira¹  Maria Adrina Paixão De Souza Da Silva¹  José Marcelino Dias Filho¹  Daniel Joaquim Da Conceição Moutinho¹  Otávio Fernandes Lima Da Rocha¹ 

[1] ,Universidade Federal do Pará Faculdade de Engenharia Mecânica Belém Pará ,Brasil

关键词: Directional solidification;    unsteady state;    primary dendrite arm spacings;    Al-Si alloys;    solidificação direcional;    regime transitório;    espaçamentos dendríticos primários;    ligas Al-Si;   

DOI  :  10.1590/S0370-44672014000300004

来源: SciELO

【 摘 要 】

The main purpose of this work is to investigate the influence of thermal parameters such as growth rate (V L) and cooling rate (T R) on the primary dendrite arm spacings (λ1) during the horizontal transient directional solidification of Al-7wt.%Si hypoeutectic alloy. The primary dendrite spacings were measured along the length of the samples and correlated with these thermal parameters. The variation of dendrite spacings is expressed as a power law function of V L and T R given by the formulas λ1 = 55(V L)-1.1 and λ1 = 212 (T R)-0.55, respectively. A comparative study between the results of this work and those from the literature proposed to investigate these dendrite spacings during the upward and downward vertical directional solidification of Al-7wt.%Si alloy is also conducted. Finally, the experimental data are compared with some predictive dendritic models from the literature.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License