Microstructure of Near-liquidus Semi-continuously Casting 6061 Aluminum Alloy

Wang Na1; Zhou Zhimin2; Lu Guimin3; Zhao Dazhi1

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Microstructure of Near-liquidus Semi-continuously Casting 6061 Aluminum Alloy
Vol. 29, Issue 6, Pages: 508-511(2009)
Published： 2009 ，
DOI：

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[1]王娜,周志敏,路贵民,赵大志.工艺条件对6061铝合金近液相线铸造微观组织的影响[J].特种铸造及有色合金,2009,29(06):508-511+484.

Wang Na1, Zhou Zhimin2, Lu Guimin3, et al. Microstructure of Near-liquidus Semi-continuously Casting 6061 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):508-511(2009)
[1]王娜,周志敏,路贵民,赵大志.工艺条件对6061铝合金近液相线铸造微观组织的影响[J].特种铸造及有色合金,2009,29(06):508-511+484. DOI：

Wang Na1, Zhou Zhimin2, Lu Guimin3, et al. Microstructure of Near-liquidus Semi-continuously Casting 6061 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):508-511(2009) DOI：

摘要

采用近液相线半连续铸造技术

制备了120mm×1600mm的6061铝合金半固态坯料

考察了铸造温度、铸造速度和冷却强度对铸锭组织的影响。结果表明

合金熔体在常规铸造温度（720℃）下获得的铸锭组织是粗大的枝晶

且组织极不均匀;在近液相线温度（657℃）下保温后铸造的铸锭组织均匀、细小、近球形。一次冷却强度的降低、二次冷却强度的增大均有利于均匀、细小的近球形组织的形成;铸造速度达到150mm/min时可以获得细小、均匀、近球形的6061半固态坯料组织。

Abstract

The semi-solid 6061 aluminum alloy billets with 120 mm in diameters and 1600 mm in length were prepared by near-liquidus semi-continuously casting.Effects of pouring temperature

pulling velocity and cooling rate on microstructure of the ingot were analyzed.The results indicate that the microstructure of ingot poured at 720 ℃ exhibits coarse dendrite with heterogeneous distribution

while that of poured at 657 ℃ exhibits homogeneous fine near-globular structure.The uniform and fine near-globular structure in the ingot can be easily formed with decreasing in firstly cooling rate and then increasing in cooling rate.In addition

the semi-solid 6061 aluminum alloy billets with uniformly fine near-globular structure can be observed with casting velocity of 150 mm/min.Near-liquidus semi-continuously casting is an effective method for preparing 6061 aluminum alloy semi-solid billets.