EVOLUTION OF MICROSTRUCTURES AND TEXTURE OF 1.3SI NON-ORIENTED ELECTRICAL STEEL IN THE TWIN-ROLL STRIP CASTING PROCESS

摘要

In this work, the influence of casting rollers which had different thermal abilities on microstructure and texture of 1.3%Si non-oriented electrical steel was investigated in a twin-roll strip casting process. The cooling capacity of copper rollers is stronger than that of steel ones, and the difference of heat transfer capacities had an obviously effect on the solidification structure and texture. The results show that the microstructures with an average grain size of ~60-200μm and ~120-320μm could be respectively obtained in strips under both copper rollers and steel rollers conditions when the melt superheats were in the range of 30 to 50°C There was a relatively random and diffuse texture in strips under copper rollers condition compared to the one under steel rollers condition, which lead to the occurrence of relatively weak Goss, Cube and γ-fiber in the annealed sheet.