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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Effect of original microstructures on microstructural evolution of A2017 semi-solid alloy billets during reheating
WANG Shun-cheng(王顺成), CAO Fu-rong(曹富荣), WEN Jing-lin(温景林)

School of Materials and Metallurgy, Northeastern University, 
Shenyang 110004, China

Abstract:The microstructural evolution of the A2017 semi-solid alloy billets provided with rheocasting and extruding/extending forming by shearing-cooling-rolling(SCR) technology during reheating in semi-solid state was investigated. The microstructural differences and their generation causes for both billets were also analyzed. The results show that during reheating, the grains of rheocasting billets grow up and spheroidize gradually with the prolongation of isothermal holding time, the eutectic liquid phase at low melting point forms mainly among the grains. However, the grains of the extruding/extending forming billets grow up abnormally through grain coalescence in the initial stage of the reheating, the entrapment of large amount of liquid within grains occurs, and the grain sizes in the reheating billets are coarse and inhomogeneous. Compared with extruding/extending forming billets, rheocasting billets have smaller and uniform grains in reheating microstructure and can rapidly form liquid phase among grains. Therefore, rheocasting billets are more suitable for the semi-solid forming than the extruding/extending forming billets.

 

Key words: semi-solid metal; rheocasting; extruding/extending forming; reheating; microstructural evolution; aluminum alloy

ISSN 1672-7029
CN 43-1423/U

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