一次结晶

这种两区域模型与三区域模型结晶模型的区别在于：在铸件的一次结晶过程中，铸件断面上不同时出现固相、固液相、液相三区域共存的状态。

This model is distinguished from the three-region crystal model in the process of primary crystals , in which not all exiting solid , liquid-solid , and solid at the same time on sections of casting .

研究了钼酸钠溶液在不同的pH值下，其一次结晶率与产成品纯度的关系，导出了钼酸钠生产的最佳控制工艺条件。

The article introduces the relation between first crystal rate of sodium molybdate solution and its crystal purity at different pH-value , and consequently presents the optimum condition of process control for the production of sodium molybdate .

文中用液淬法研究了耐热球墨可锻铸铁的一次结晶过程，用定量图像分析仪研究了石墨的析出量，用X射线探伤仪研究了形成缩孔缩松的倾向。

This article use the way of liquid hardening to study its first crystallization , use quantitative image analysis to study the quantity of indigenous graphite , use X-ray defectoscopy to study the tendency of shrinkage cavity and porosity forming .

实验结果表明：以水作为外相，采用HLB值大于18的复合型乳化剂，经一次结晶所得精萘的结晶点大于79.6℃，精萘质量符合国家一级精萘标准，精萘产率在90%左右。

The results show that when the mixed emulsifiers ( HLB > 18 ) is used and water as ex-ternal phase , the solidification point of pure naphthalene are higher than 79.6 ℃ and the yield of pure naphthalene are about 93 % .

铸造锌铝合金的一次结晶和组织特点

The primary crystallization and structure of zinc - aluminium foundry alloys

稀土在钢的一次结晶中的作用

Effect of Rare Earth Elements on Solidification Structure of Steels

模拟结果符合亚共晶球铁的一次结晶过程；

The result of the simulation is in accordance with the crystallization process .

亚共晶铸铁一次结晶过程的两区域结晶物理模型

A Two - Region Crystal Micro-Physical Model for the Primary Crystallization of Hypoeutectic Casts

熔核的一次结晶是点缝焊接头形成过程中的重要环节之一。

The primary crystal of molten metal is one of the important links in the process of spot and seamwelding joint .

研究了稀土氧化物对堆焊金属冲击韧度及一次结晶组织的影响。

The effect of rare earth ( RE ) oxide on impact toughness and primary structure of surfacing welding metal was investigated .

本文应用微分热分析液淬法研究了不同蠕化率蠕铁的一次结晶过程。

Using differentiated thermal analysis quenching method , the solidification process of CG cast iron with various percentage of compacted graphite particles is investigated .

实验结果表明，乙醇作溶剂一次结晶的萘产品结晶点为79.5℃，对苯并噻吩的脱除率为50%左右；

The results show that the solidification point of one step crystallization product is about 79.5 ℃ and half of the benzothiophene in crude naphthalene is removed .

电磁搅拌焊接方法，可以有效地细化焊缝一次结晶，减小焊缝金属的偏析程度，降低焊缝结晶裂纹和气孔的敏感性，提高焊缝金属的塑、韧性。

The electromagnetic stirring ( EMS ) is effective to refine the grain structure , homogenize the composition , reduce the susceptibility of weld solidification cracking and porosity , improve the ductility and toughness of weld metal .

由粗品一次萃取结晶的MC回收率超过92%。

Extracting and crystalling recovery of MC exceeds 92 % .

普通模铸造一次冷却结晶区的铸锭质量及影响

Quantity and Influences in the Casting Lies the First Area of Cooling and Crystallize in Common Mold

首次报道在微量非离子表面活性剂存在下，以3%～20%的乙醇一次快速结晶药用甘氨酸α晶体的工艺。

A new technical method of purifying the medicine glycine α crystal using nonionic surfactant and alcohol of concentration from 3 % to 20 % as crystallization solution was reported .

考虑一道次动态再结晶的二道次热轧仿真

FEM simulation of hot rolling process in the second pass considering dynamic recrystallization in the first pass

一道次动态再结晶的发生可显著消除一道次热变形产生的加工硬化，二道次热轧变形应力降低。

Dynamic recrystallization behavior during the first hot working can significantly eliminate work-hardening and the stress of second hot rolling is lower . 4 .