Fe-3%Si电工钢铸坯柱状晶织构的演变规律

EVOLUTION OF TEXTURES OF COLUMNAR GRAINS IN Fe-3%Si ELECTRICAL STEEL SLABS

采用Fe-3%Si电工钢铸坯中长轴平行于轧向的不同数量柱状晶进行了冷变形及再结晶退火,采用EBSD分析技术对柱状晶织构的转变行为进行了研究.结果表明,原始柱状晶为立方取向的单柱状晶时,大压下率一次冷轧及再结晶退火不利于立方织构的保留;小压下率二次冷轧及再结晶退火会形成强立方织构,该立方织构强烈阻碍Goss晶粒的异常长大;原始柱状晶为立方和Goss位向的双柱状晶时,大压下率冷轧条件下,Goss取向快速转向{111}<112>而有效地保留了立方取向,Goss和立方取向柱状晶之间的晶界没有强的交互作用;原始柱状晶为多种位向的多柱状晶时,柱状晶晶界能促进g织构及减少立方织构,有利于Goss晶粒异常长大.

Different numbers of columnar grains in a Fe-3%Si electrical steel slabs with their major axes being parallel to the rolling direction were used for cold rolling and recrystallization annealing. The evolution of the texture of columnar grains was followed by EBSD technique. The results show that, in the case of single columnar grain with cube orientation, cube texture is adverse to be retained in condition of primary cold rolling with high reduction and recrystallization annealing, while strong cube texture can form after secondary cold rolling with low reduction and recrystallization annealing. But the cube texture hinders strongly the abnormal growth of Goss grains.For the sample containing two columnar grains with Goss and cube orientation, the initial Goss orientation rotates to {111} 112 orientation quickly and cube texture is retained effectively during cold rolling by high reduction.The interaction between the Goss and cube columnar grains is not strong. For the multi-columnar grains with different orientations, the grain boundaries between columnar grains promote g- texture and weaken the cube texture,which is in favor of abnormal growth of Goss grains.