The induced electromagnetic field possesses the action of electromagnetic purification, and effectively removes formation of impurity grain, segregation, negative segregation and gas cavity. 感生磁场具有电磁净化的作用,可以有效地消除杂质颗粒以及偏析、负偏析和气孔形成的机率。
But severe dendritic segregation and macroscopic negative segregation of Sn often happen in the course of solidification for the alloy prepared by conventionally casting method because of high content of Sn. 但该合金由于合金元素Sn的含量高,采用传统的熔铸方法制备时,凝固过程中Sn易产生严重的枝晶偏析和宏观反偏析。
In the mice testicle cells chromosome aberration test, although the results were negative, the segregation of chromonemas increased with the rise of concentration of MTBE, which indicated that MTBE may have the genotoxicity. 在小鼠睾丸染色体畸变实验中,虽然实验结果为阴性,但随着MTBE剂量的增加,染色体分离有增加趋势,表明其可能存在遗传毒性。
Between two layers, it is the complex structural transitional zone. There exists Sn negative segregation in the cast structure by macro observation and the content of Sn decreases from outside to inside. 宏观上铸态组织存在Sn的反偏析,Sn的含量从外到内呈现下降趋势。
In contrast, it presented positive segregation. The positive segregation in the upper center and the negative segregation in the exterior region of the ingot are found at the same time. 还发现,在铸锭的中心靠上的区域形成正偏析,在铸锭的外部区域形成负偏析。
In the slab, the negative carbon segregation region and positive segregation in the center are observed simultaneously. 在板坯中碳的偏析同时存在负偏析区和中心正偏析。
It was shown that with the M-EMS intensity increase, the central carbon segregation in billets decreased, but the negative segregation near the edge in billets became worse. 在结晶器电磁搅拌条件下,随着二冷比水量增大,中心碳偏析减小;
With the enlargement of the columnar crystals ′ spacing interval, the positive and negative segregation extents generated by the periodic bending deformation at the liquid-solid interface of billet are enlarged. 固液界面发生周期性弯曲变形所引起的正偏析与负偏析的程度,随枝晶间距的增大而增加;
Study on the mechanism of the negative segregation band formation during CC process with EMS 连铸过程采用电磁搅拌时的负偏析带的形成机理
The results show that there is a negative segregation region of impurity in the sample. Solidification parameters G, R and G/ R have markable influence on purification property of impurity. 结果表明,在冶金级硅单向凝固试棒中,存在杂质元素的负偏析区,凝固工艺参数GL、R及GL/R对杂质元素的分凝特性有极显著的影响。
The negative impacts of the wall on people ′ s lives and the necessity of destroying it are explored, thus the poets ′ wishes for equality and harmony between people and their political ambition of opposing segregation revealed. 通过对墙给人们生活带来的负面影响和推倒墙的必要性的分析,揭示了诗人追求人人平等、和睦相处的良好愿望和反对种族隔离政策的政治抱负。
Influence of negative segregation on CC steel properties 白亮带对连铸钢性能的影响
The effect of positive segregation element Mn and negative segregation element Si on matrix microhardness distribution of grey cast iron have been investigated. 研究了正偏析元素Mn和反偏析元素Si对铸铁基体显微硬度分布的影响。
The hot ductility is improved and the rate of finished product of forgings is increased by about 3%, which are mainly because of RE enrichment at grain boundaries to dissolve the negative effect of S segregation at grain boundaries. 钢的热塑性提高,成材率提高3%左右,这些与稀土在晶界富集消除了硫在晶界的偏聚作用有关。
Some good results can be obtained while applying EMS to CC process, but the heavy negative segregation band(" white band") appears at the same time. 连铸过程中采用电磁搅拌可以产生积极的冶金效果,但同时又伴有严重的负偏析带(白亮带)的产生。
When the ingot is cooled from the mold side, A-type segregates may form in the casting and segregated channels form on the surface, while the positive and negative segregation form in the top and the bottom of the ingot, respectively. 侧向凝固的铸锭在顶部形成正偏析,在底部形成负偏析,在表面形成“沟槽”偏析,在铸锭内部形成A形偏析。
Now the negative social problems of polarization such as social polarization, community reconstruct, community segregation, employment pressure are appeared in Pudong New Area and affect its sustainable development. 当前浦东新区极化开发引发的负外部性问题如社会极化、社区重组、社区隔离、就业压力已经开始显现,并对浦东新区的社会稳定和可持续发展产生一定的影响。