Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第13卷    第3期    总第54期    2003年6月

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文章编号:1004-0609(2003)03-0589-05
铝合金铸轧组织的物理模拟
刘 咏, 周科朝, 林映红,王海兵

(中南大学 粉末冶金国家重点实验室, 长沙 410083)

摘 要: 设计了铝合金铸轧工艺模拟的实验装置,研究了在该试验条件下, 铝合金变形组织与工艺参数的关系。 结果表明: 按照本试验的设计, 在夹头通水冷却的Gleeble-1500热模拟机上能够得到铝的“人”字形特征的柱状晶组织, 实现铸轧组织的物理模拟过程。 铝合金模拟铸轧的显微组织对外力施加的应变速率很敏感: ε·=0.125s-1时, 变形开始与凝固过程发生耦合, 铸轧组织发生转变; 应变速率增大至ε·=0.300s-1时, 铸轧柱状晶发生等轴化。 铸轧组织的形成主要是变形作用于未凝固的液相,引起质量和热量的分布状态发生改变所致。 提高铸轧速度, 有利于铸轧组织的形成和铸轧柱状晶的等轴化, 并且使所需的轧制力减小, 有利于铸轧工艺的优化。

 

关键词: 铝合金;铸轧; 物理模拟; 显微组织

Physical simulation of roll-casting microstructure of Al alloy
LIU Yong, ZHOU Ke-chao, LIN Ying-hong, WANG Hai-bing

State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China

Abstract:An experimental instrument for simulating the roll-casting process was designed, and the effect of processing parameters on the microstructure of Al alloy was studied. Results show that with a specifically designed instrument equipped in a Gleeble-1500 Thermal Simulation Tester the typical microstructure with the characteristic of realistic roll-casting process can be obtained, and the microstructure is sensitive to the strain rate. When ε·=0.125s-1, the plastic deformation of Al alloy starts to couple with the solidification process, and the microstructure is of the roll-casting character. Whenε·=0.300s-1, the column crystals transform to equiaxed ones. The formation of roll-casting microstructure is mainly attributed to the deformation of un-solidified liquid phase, the varied distribution of mass and heat. Increasing the deformation velocity would do good to the formation of roll-casting microstructure and the equiaxed column crystals, and would decrease the rolling load.

 

Key words: roll-casting; Al alloy; physical simulation; microstr

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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