Nb对低温取向硅钢高斯织构演变的影响

Effect of niobium on goss texture evolution of low temperature orientation silicon steel

采用电子背散射衍射仪(EBSD)分析了Nb对取向硅钢热轧板、中间退火板、脱碳退火板及高温退火板的厚度方向晶粒尺寸、织构类型及体积分数的影响。结果表明,取向硅钢中添加Nb元素,得到纳米级NbCN与MnS与Cu_2S复合析出相,热轧板、中间退火与脱碳退火板晶粒细化。含Nb取向硅钢热轧板表层与次表层含有较高体积分数的{110}<001>Goss织构,热轧板中心层与脱碳退火板含有较高含量的γ纤维织构{111}<112>和{111}<110>。含Nb取向硅钢高温退火后Goss织构体积分数达到74.6%,而不含Nb取向硅钢Goss织构体积分数只有39.7%。

The influences of Nb on grain size at thickness direction,type and volume fraction of texture of hot rolled sheet,medium annealing sheet,decarburization annealing sheet and high temperature annealing sheet of orientation silicon steels were analyzed by electron backscatter diffractometer（ EBSD） technqiue. The results show that the nano-size precipitated phases of Nb CN,Mn S and Cu2 S are obtained by adding Nb elements in the orientation silicon steel,and the grain size of the hot rolled sheet,medium annealing sheet and decarburization annealing sheet is fine. The volume fraction of the { 110} 001 orientation grains at the surface and subsurface of the hot rolled sheet is high,and the volume fraction of { 111} 〈112〉 and { 111}〈 110〉 orientation grains at the medium place for the hot rolled sheet and decarburization annealing sheet of the niobium bearing silicon steel are higher than that of the niobium free steel. The volume fraction of Goss texture is 74. 6% for the niobium bearing steel and 39. 7% for the niobium free steel after high temperature annealing.