柱状晶区

双辊薄带凝固组织中柱状晶区所占比例对薄带质量有非常重要的影响。

The quality of twin roll thin strip is greatly effected by the columnar zone proportion in solidification structure of thin strip .

本文在已建数学模型的基础上，模拟预测了浇铸温度、铸辊转速、熔池高度等工艺参数对双辊薄带凝固组织中柱状晶区比例的影响。

On the basis of mathematical model developmented , the effects of teeming temperature , height of molten pool and angular velocity of roll on columnar zone proportion in solidification structure of twin roll thin strip have been predicted .

随着振动的加强，纯Al中心的等轴晶区逐渐增大，边缘部位的柱状晶区逐渐减小，当振击力达到81.87N时整个试样端面全部变为等轴晶。

With vibration strengthening , the zone of equiaxed grain gradually increases and the zone of column grain gradually decreases . When the power of vibration reached 81.87N , the grains of aluminum became equiaxed grain in full section of casting .

测试结果表明：CVD-W生长组织具有三个生长区，分别是等轴晶区、混合生长晶区和柱状晶区；

The test result shows that there are three growing zones in micro-structure of CVD-W : region of equiaxed grain , region of mixed grain and region of columnar grain .

结果还表明，铸件柱状晶区的形成与生长并不要求高的温度梯度。

The results also show the formation and growth of column crystals demand no higher temperature gradient .

焊缝柱状晶区的组织由沿柱状晶界分布的先共析铁素体+侧板条铁素体+块状铁素体+针状铁素体组成；

The microstructure of weld seam columnar grain are composed of proeutectoid ferrite 、 FSA 、 massive ferrite and acicular ferrite .

应用建立的微观组织模型，研究了三种工艺参数对柱状晶区宽度的影响。

By use of this model , the effects of process parameters on the width of columnar grain zone were studied .

结果表明：脉冲电流能够扩大纯铝铸锭的等轴晶区、缩小柱状晶区，并使晶粒尺寸细化。

The results showed that pulse current can enlarge equiaxed crystal area , narrow columnar crystal area and refine crystal pure Al ingot .

发现沿定向凝固生长方向微观组织依次呈现细等轴晶区柱状晶区粗等轴晶区的演化规律。

It is found that along the growth direction microstructure consist of fine equiaxed grain zone , columnar grain zone and coarse equiaxed grain zone in turn .

凝固组织中的等轴晶尺寸和柱状晶区内的二次枝晶臂间距随磁通量密度增加而减小。

Both the grain size of equi - axed grain and the secondary dendrite arm spacing in columnar grain region decreased with the increase of magnetic flux density .

而且，随着搅拌电压的增大，柱状晶区越小，等轴晶区越大，晶粒越细小；

And with the increase of agitation voltage , the columnar crystal area will become larger and the isometric crystal area will become smaller , thus smaller crystal grains ;

温度场改变后，合金铸锭组织改为四部分组成：细晶区；柱状晶区；柱状晶与等轴晶混合晶区和标准等轴晶区。

After the temperature change : ingot microstructure of Al-5 % Cu alloy consisted of four part : fine grain region 、 columnar grain region 、 columnar grain and equiaxed grain mixed region 、 equiaxed grain region .

碳原子向晶界扩散引起界面附近钢侧柱状晶区，铁原子向钛中扩散引起界面附近钛侧无晶界区与针状马氏体区，钢表面脱碳加速这一过程的进行。

Columnar crystal areas are generated near the interface by carboatomic diffusing in to grain boundary , and acicular martensitic areas are generated near the interface by Fe atoms diffusing to Ti , and decarburation on steel surface promotes the process .

通过进一步优化工艺参数，减少了圆管坯内部裂纹，扩大中心等轴晶区，缩短柱状晶区，使圆管坯质量得以改善，从而提高了圆管坯的穿孔性能，减少钢管内折。

Optimize the technology data ulteriorly , reduce crack on the interior round billet , enlarge the center equiaxial crystal area and shorten columnar crystal face to amend the quality of round billet . According to improve the perforation capability , reduce the steel tube from inflexed .

焊缝区组织主要为等轴晶和树枝柱状晶，熔合区组织主要为柱状晶。

The crystallizing morphology on the weld seam was equiaxed grains and dendrites and that on the fusion area were columnar crystals .

研究结果表明，在激光作用下，相应于不同的温度范围涂层形成了熔凝区（柱状晶）、烧结区（团絮状组织）和残留等离子区（层状结构）。

The results showed that the coating formed the melted zone ( columnar grains ), the sintered zone ( nodular structure ) and re - mained plasma-sprayed zone ( lamellar structure ) according to the different temperature range .