Simulation of Temperature and Flow Field by Three Dimension Finite Element Method for Castex Process of AS Wire

Convefltionalextrudingtechnologiesmostlyatilizethelinearmovementofchiefcylinderinhydraulicpressurecrocktopushthemetalintheextrudingcontainertodeformplastically.Inordertorealizecontinuousextensioningottheingotextrusiontechnology(extrusionwithoutremain...     

连续铸挤Al-5Ti-1B合金线的组织与晶粒细化效果

采用连续铸挤成形Al-5Ti-1B合金线,采用光学显微镜和扫描电镜分析了Al-5Ti-1B合金线的显微组织和晶粒细化效果,并与A1-5Ti-1B合金锭进行了比较.结果表明,连续铸挤 Al-5Ti-1B合金线中TiAl3 相呈细小圆块状,分布均匀,TiB2粒子弥散分布于铅基体;而Al-5Ti-1B合金锭中TiA13相呈粗大板条状,TiB2 粒子偏聚于铝晶界呈粗大团块状.Al-5Ti-1B合金线对纯铝的晶粒细化效果优于Al-5Ti-1B合金锭,纯铝加入A1-5Ti-1B合金线5 min后,晶粒尺寸达到最小.     

Al-5Ti-1B合金线对纯铝的晶粒细化作用

采用电磁搅拌连续铸挤Al-5Ti-1B合金线对纯铝进行细化试验,研究了熔体静置时间、合金线添加量以及添加温度对晶粒细化效果的影响。结果表明,熔体静置时间为5min时,合金线的细化效果较好,静置时间在120min之内,细化效果未出现明显衰退现象;随着合金线添加量的增加,细化后纯铝的晶粒尺寸逐渐减小;细化温度为700～730℃时,Al-5Ti-1B合金线具有较好的细化效果,温度为690℃时,晶粒局部粗大,温度为740℃时,细化后纯铝晶粒尺寸较大。     

Experiment Study on Castex Process of AS Wire

In order to optimize the Castex process of AS wire, the systematic experiments have been done for differed process parameters with self-made DZJ-II 350 Castex machine. The parameters, such as casting temperature of aluminum, flow of cooling Water, extrusion ratio and the gap between the surface of wheel and that of the mould, have been mainly studied. The results show that with the increase of casting temperature or rotating speed of wheel the measured length of liquid metal zone increases too. However, the length of liquid metal zone decreases with the increase of the flow of cooling water Moreover, the relationship between the extrusion ratio and the extrusion power is studied.     

CASTEX FORCE OF AS WIRE IN BONDING ZONE

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电磁搅拌连续铸挤Al-5Ti-1B合金的组织与晶粒细化效果

采用电磁搅拌连续铸挤工艺成形Al-5Ti-1B合金线,利用等离子体发射光谱仪、光学显微镜、X射线衍射仪和扫描电镜研究了Al-5Ti-1B合金线的组织与晶粒细化效果,并与Al-5Ti-1B合金锭进行了比较。结果表明,通过中间包电磁搅拌和连续铸挤成形过程中半固态剪切搅拌和剧塑性变形作用,可细化TiAl3相尺寸,改善TiB2粒子的分布状态,TiAl3相为细小块状,TiB2粒子弥散分布于α-Al基体中。Al-5Ti-1B合金线的晶粒细化能力增强,纯铝中添加0.2%的Al-5Ti-1B合金线静止5min,晶粒平均尺寸可细化至223μm,静止180min,晶粒平均尺寸为316μm。     

NUMERICAL SIMULATION ON DEFORMATION CHARACTERISTICS OF AS WIRE BY CASTEX

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