取向硅钢铸态组织分析  

Analysis on Oriented Silicon Steel Cast Structure

作　　者：张思佳[1] 冯运莉[1] 尹晓盼 

机构地区：[1]河北联合大学冶金与能源学院,河北唐山063009

出　　处：《热加工工艺》2015年第22期27-30,36,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51274083);河北省高等学校创新团队领军人才培育计划(LJRC007);河北省自然科学基金资助项目(E2013209228)

摘　　要：通过观察取向硅钢的低倍组织,分析水冷和空冷及铌的加入对铸态组织的影响,并结合金相显微镜、扫描电镜对铸态组织进行了观察及表征。对比分析了含铌取向硅钢与不含铌取向硅钢的铸态组织的差异。试验结果表明:经空冷处理的含铌铸坯其铸态组织有非常明显粗大的柱状晶,所占体积分数约64%,表层的细晶区很薄,中心是更细小的等轴晶。而采用水冷处理的含铌铸坯组织以中心等轴晶为主,所占体积分数约78%,柱状晶较小不明显。经相同水冷条件,不含铌的铸坯得到的铸态组织中其晶粒尺寸比含铌的偏大,其柱状晶比含铌铸坯的明显,中心等轴晶所占体积分数较少(约41%),说明铌的加入能使铸坯晶粒更均匀细小。By observing oriented silicon steel low magnification,effects of two different cooling rates （quenching and air-cooled） and niobium content on cast structure were analyzed. Combined with TEM and SEM, cast structure was observed and characterizated. Differences of cast microstructure between oriented silicon steel with Nb and the oriented silicon steel without niobium were analyzed. The results show that after air-cooled, the cast structure of the test steel with Nb has very significant coarse columnar crystals. Volume fraction of coarse columnar crystals is about 64%. Surface layer fine-grained zone is thin and equiaxial crystal is much finer in center. After quenching the cast structureofthe test steel with Nb has main center equiaxial crystals The volume fraction of center equiaxial crystals is 78%. Columnar crystals are less and small. The grains of cast structure in oriented silicon steel without niobium are bigger than the grains in oriented silicon steel with Nb when they are both quenched. The volume fraction of center equiaxial crystal is about 41%. The addition of niobium can make cast grains more uniform and finer.

关 键 词：取向硅钢 低倍组织 显微组织 SEM照片 

分 类 号：TG142.33[一般工业技术—材料科学与工程]