电工钢中柱状晶尺寸及退火工艺对{100}织构的影响  

Effects of columnar grain sizes and annealing process on the heredity of {100} texture in Fe-3% Si electrical steel

作　　者：丁磊[1] 邵媛媛[1] 杨平[1] 毛卫民[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2013年第8期111-117,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(51071024)

摘　　要：利用EBSD技术研究了电工钢中不同的柱状晶尺寸及退火工艺下{100}织构的演变规律。结果表明,初始晶粒尺寸的影响最显著。细小柱状晶热轧后经过常化处理,组织已均匀,但中心层有强{100}织构。粗大柱状晶中{100}织构的遗传性强,常化及中间退火后,中心层仍有粗大的以{100}取向为主的晶粒;脱碳退火后才能完成组织均匀化和织构梯度的弱化。常化时的升温速度也对织构演变存在影响,低的升温速度有利于{100}织构的保留,但升温速度的影响没有初始晶粒尺寸及退火次数的影响显著。细小柱状晶样品经过热轧及三次退火工艺适合制备取向电工钢。Evolution of t {100} texture of different columnar grains and annealing process was investigated in electrical steels with the help of EBSD technique. The results show that the effect of initial grain size is the strongest. The initial fine-grained specimen shows uniform mierostructure after the normalizing process, while { 100} grains appear preferentially in the central layer of sheets. The heredity of t 1001 texture in the initial coarse-grained specimen is more significant. { 100 t mainly-oriented coarse grains still exist in the central layer after the normalizing and intermediate annealing process and homogeneous microstructure and weak texture gradient are obtained after the decarburizating annealing process. The heating rate of normalizing also affects texture evolution and a low heating rate is beneficial to the retention of {100} texture. However, the effect of heating rate is less significant than that of both of the number of annealing process and initial grain size. Initial fine-grained specimen is suitable for the preparation of grain-oriented electrical steels after hot rolling and three annealing process.

关 键 词：电工钢 柱状晶 织构 退火 

分 类 号：TM275[一般工业技术—材料科学与工程]