MgO涂层对Hi-B钢织构与抑制剂的影响

研究了MgO涂层对Hi-B钢高温退火过程中组织织构与抑制剂的影响。借助磁性能测试仪测试其磁性能,使用金相显微镜(OM)观察试样组织,借助扫描电子显微镜(SEM)和EBSD技术进行抑制剂观察和织构检测,利用投射电子显微镜(TEM)及能谱仪(EDS)进行能谱分析。结果表明:氧化镁涂层能延缓抑制剂粒子的分解,保持较高的粒子分布密度,进而抑制初次再结晶晶粒的粗化,提高二次再结晶的开始温度。另一方面涂层能影响二次再结晶过程。无涂层样品与氢气直接接触,较多接近{110}面织构而与〈001〉晶向偏差较大的晶粒发生了异常长大,导致二次再结晶晶粒数量更多,尺寸更小且Goss织构比较散漫。有涂层样品Goss织构更加锋锐且磁性能更优。

Effect of MgO coating on texture and inhibitor of Hi-B steel

The effects of the MgO coating on the microstructures and inhibition of the Hi B steel during high temperature annealing were investigated. The performance was measured by magnetic performance tester, the microstructure of the sample was observed by optical microscope (OM), the inhibitor observation and texture detection were performed by the scanning electron microscope (SEM) and EBSD techniques, using transmission electron microscope (TEM) and energy disperse spectroscopy (EDS) for energy spectrum analysis. The results show that the magnesium oxide coating can delay the decomposition of the inhibitor particles and maintain a high particle distribution density, thereby suppressing the coarsening of the primary recrystallized grains and increasing the starting temperature of the secondary recrystallization. On the other hand, the coating can affect the secondary recrystallization process. The uncoated sample is in direct contact with hydrogen, and the crystal grains which are close to the {110} surface texture and have a large deviation from the 〈001〉 crystal orientation are abnormally grown, resulting in more secondary recrystallized grains, smaller grain size and more dispersed Goss texture. The Goss texture of the coated sample is sharper and the magnetic properties are better.