高硅钢温轧过程压下率及中间退火对组织、织构的影响

                            高硅钢温轧过程压下率及中间退火对组织、织构的影响

刘璐¹, 杨平^1*, 秦镜¹, 毛卫民^1,2, 叶丰²

（北京科技大学1. 材料科学与工程学院，2.新金属材料国家重点实验室，北京 100083）

摘 要：传统轧制法制备6.5wt.%高硅钢过程中温轧工艺具有显著不同于3 wt.% Si的电工钢的特点及组织织构特征，是开发新型基于织构优化的高硅钢的关键环节。采用EBSD技术对通过热轧、温轧、冷轧及退火工艺制备0.3mm厚的6.5wt.%Si电工钢板的组织和织构进行分析，重点研究温轧过程中的中间退火和大、小压下率组合以控制织构。结果表明，在热轧退火板是部分再结晶组织的情况下，一次性温轧或先小形变量、中间退火后再大形变量的工艺可得到更多的Goss晶粒；经过最终退火后Goss取向会发生偏转，形成部分黄铜取向，而{111}<112>取向的晶粒内形核生成近Goss取向的再结晶晶粒；大压下量轧制是最终组织中{111}取向晶粒较多的主要原因。

关键词：高硅钢；织构；温轧；组织梯度

中图分类号：TG142；TG335.1 ；TG115.21⁺5.3；TG115.23   文献标识码：A  doi:10.3969/j.1000-6281.2013.06.002

Effects of rolling reduction and intermediate annealing on the microstructure and texture of 6.5 wt.% Si electric steelduring warm rolling

LIU Lu¹，YANG Ping^1*，QIN Jing¹，MAO Wei-min^1,2，YE Feng²

(1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083;

2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China)

Abstract:Warm rolling, a key process of developing new type high-Si electrical steel based on texture optimization, has significant different characteristics from 3wt% Si steel in conventional preparing process. 0.3mm thickness 6.5wt.% Si steel, obtained by a series of processes including hot and warm rolling, intermediate annealing and then cold rolling, was analyzed from microstructure and texture by EBSD, which are utilized mainly for investigating the intermediate annealing process and the combination of large and small reductions in warming rolling with the purpose of controlling the texture. The results show that, under the condition of partial recrystallization, more Goss grains will be obtained when warm rolling without intermediate annealing was carried out or first small reduction, then intermediate annealing process, and last large reduction were performed. After final annealing treatment, Goss component will show a slight deflection, and partially convert into Brass orientation, while new recrystallized grains with the orientation close to Goss can nucleate in the deformed {111}<112> grains. There is a large number of {111} grains within the resultant microstructure due to the large reduction rolling.

Keywords：high silicon steel；texture；warm rolling；microstructure gradient

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