取向硅钢铸态组织分析

发布时间：2018-10-05 10:36

【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。
[Abstract]:The effects of water cooling and air cooling and niobium addition on the as-cast microstructure were analyzed by observing the low-power microstructure of oriented silicon steel. The as-cast microstructure was observed and characterized by SEM and metallographic microscope. The difference of as-cast structure between niobium oriented silicon steel and non niobium oriented silicon steel was analyzed. The experimental results show that the as-cast structure of niobium bearing billet treated by air cooling has very large columnar crystal with a volume fraction of about 64. The fine crystal area in the surface layer is very thin and the center is smaller equiaxed crystal. The structure of niobium-bearing billet treated by water cooling is mainly central equiaxed crystal, the volume fraction of which is about 78%, and the columnar crystal is not obvious. Under the same water cooling condition, the grain size of the as-cast structure without niobium is larger than that containing niobium, and the columnar crystal is more obvious than that of the blank containing niobium. The volume fraction of central equiaxed crystal is less (about 41%), which indicates that the addition of niobium can make the grain of billet more uniform and finer.
【作者单位】：河北联合大学冶金与能源学院;
【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)
【分类号】：TG142.1

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