取向电工钢再结晶织构的演变行为研究

发布时间：2018-05-18 16:07

本文选题：取向电工钢 + 立方织构　；参考：《辽宁科技大学》2015年硕士论文

【摘要】：取向电工钢作为一种重要的软磁材料,已经成为电力、电子和军事工业中不可或缺的软磁材料,主要应用于各类变压器的铁芯。取向电工钢的制造工艺和设备复杂,成分控制严格,杂质含量要求极低,制造工序长和影响因素多,因此,其产品质量的好坏常被作为衡量一个国家特殊钢制造技术水平的重要标志,并且取向电工钢又被称为钢材中的“艺术品”。目前商业化生产的取向电工钢都具有高斯织构的,而本文中所研究的取向电工钢是具有立方织构,由于取向的特殊性,使得取向电工钢在横向和轧向都是易磁化的,所以具有非常重要的研究意义。冷轧是连接热轧与再结晶退火的关键工序,也是决定再结晶织构和组织演变特征的关键因素之一。二次再结晶过程对于取向电工钢获得高取向度的立方织构有着非常重要的影响,因此,探索有效调控取向电工钢形变织构以及初次再结晶织构的方法,是发展取向电工钢先进技术的方向;二次再结晶过程中如何有效控制微观组织的转变对研究取向电工钢立方织构的形成有着重要的意义。本文以鞍山钢铁集团公司生产的普通取向电工钢为研究对象,在实验室条件下,采用冷轧、真空管式炉气氛退火的方式,借助微观织构分析方法——EBSD技术分析从热轧板到最终成品过程中立方织构的如何形成的、二次再结晶过程中第二相粒子是如何影响立方织构形成的,通过对观察结果进行分析得到了如下的结论:(1)采用纵横交叉轧制的二次冷轧法和中间退火的方法,得到了厚度为0.3mm、取向较为集中的、以(100)[001]立方织构为主的双取向硅钢。(2)从热轧板到二次冷轧完成,电工钢板中的织构类型由{001}110到{111}112再到{111}110,经过中间退火后的六道次织构类型变成了{001}100,在再结晶退火过程中,主要的织构类型为γ纤维织构,随着再结晶温度的升高,立方织构先消失而后强度逐渐增高。(3)二次冷轧工艺为电工钢板提供了大量的(100)面织构,再结晶退火过程中形成的γ纤维织构为立方织构的形成提供了充足的能量,高温净化退火过程中,(100)[001]取向晶粒的低的表面能,使立方织构晶粒的选择性优先生长,吞并其他晶粒。(4)通过对立方织构和晶界特征分布的情况分析看,随着温度的升高,立方织构附近特征晶界Σ13b增多,而Σ5、Σ7数量减少,说明Σ5晶界具有较高的迁移率,对立方织构形成有利。同时对再结晶过程的钢板进行微观组织观察发现,在晶界处出现了细小的第二相粒子,如Al N,这些粒子晶界附近溶解与固溶,产生了钉扎效应,阻碍了晶界的长大,这些因素都为立方织构晶粒的异常长大了提供了有利条件。
[Abstract]:As an important soft magnetic material, oriented electrical steel has become an indispensable soft magnetic material in power, electronics and military industries. It is mainly used in the core of various transformers. The manufacturing process and equipment of oriented electrical steel are complex, the composition is strictly controlled, the impurity content is very low, the manufacturing process is long and the influence factors are many, therefore, The quality of its products is often regarded as an important symbol to measure the manufacturing technology level of special steel in a country, and the oriented electrical steel is also called "art" in steel. At present, the oriented electrical steels produced commercially all have Gao Si texture, and the oriented electrical steels studied in this paper have cubic texture. Because of the particularity of orientation, the oriented electrical steels are magnetized in both transverse and rolling directions. So has the very important research significance. Cold rolling is the key process to connect hot rolling and recrystallization annealing, and it is also one of the key factors to determine the characteristics of recrystallization texture and microstructure evolution. The secondary recrystallization process plays an important role in obtaining high orientation cubic texture of oriented electrical steel. Therefore, the methods of controlling deformation texture and primary recrystallization texture of oriented electrical steel are explored. It is important to study the formation of cubic texture of oriented electrical steel how to control the transformation of microstructure effectively in the process of secondary recrystallization. In this paper, the common oriented electrical steel produced by Anshan Iron and Steel Group Co., Ltd is taken as the research object. Under the condition of laboratory, the cold rolling and vacuum tube furnace atmosphere annealing are adopted. With the help of microtexture analysis method, EBSD technique is used to analyze how the cubic texture is formed in the process from hot rolled plate to final product, and how the second phase particles affect the formation of cubic texture in the process of secondary recrystallization. Through the analysis of the observation results, the following conclusion is drawn: 1) by using the secondary cold rolling method and the intermediate annealing method, the thickness is 0.3 mm and the orientation is more concentrated. The double orientation silicon steel with [001] cubic texture is finished from hot rolling plate to secondary cold rolling. The texture type of electrical steel plate changes from {001} 110 to {111} 112 to {111} 110. The six times texture type after intermediate annealing becomes {001} 100. During recrystallization annealing, The main texture type is 纬 -fiber texture. With the increase of recrystallization temperature, the cubic texture disappears first and then the strength increases gradually. The 纬 -fiber texture formed during recrystallization annealing provides sufficient energy for the formation of cubic texture. In the process of high temperature purification annealing, the low surface energy of [001] oriented grain makes the selective growth of cubic texture preferential. Annexation of other grains. (4) from the analysis of the distribution of opposite square texture and grain boundary characteristics, it can be seen that with the increase of temperature, the characteristic grain boundary 危 13b near cubic texture increases, while the number of 危 5 and 危 7 decreases, which indicates that 危 5 grain boundary has higher mobility. The opposite square texture is favorable. At the same time, the microstructure of the recrystallized steel plate was observed. It was found that small second phase particles, such as Al N, dissolved and dissolved near the grain boundary, which resulted in pinning effect and hindering the growth of grain boundary. These factors provide favorable conditions for the abnormal growth of cubic texture grains.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.1

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