高磁感取向硅钢的脱碳退火工艺

采用自主研发的热处理试验装置，完成高磁感取向硅钢27QG090实验室脱碳退火过程，利用蔡司显微镜和X射线衍射仪分析脱碳退火后试样的显微组织和宏观织构。结果表明，高磁感取向硅钢27QG090经实验室脱碳退火后的显微组织类型为铁素体，平均晶粒尺寸为30～40μm。宏观织构主要类型为α织构和α^*织构({114}〈481〉、{113}〈361〉等织构),还有微弱的高斯织构{110}〈001〉。经实验室研究选定的最优工艺为850℃脱碳退火7 min。采用该工艺在工业生产线脱碳退火后的宏观织构与实验室脱碳退火后主要织构类型相同。脱碳退火后平均晶粒尺寸为30μm左右时，铁损最低，为0.80 W/kg,磁感应强度可达到1.93 T。

Decarburization annealing process of high magnetic induction oriented silicon steel

Decarburization annealing process test was carried out on high magnetic induction oriented silicon steel 27QG090 in the laboratory by means of independently developed heat treatment test device. The microstructure and macroscopic texture of the specimens after decarburization annealing were analyzed by means of Zeiss microscope and X-ray diffractometer. The results show that the microstructure of the 27QG090 high magnetic induction oriented silicon steel after decarburization annealing is ferrite and its average grain size is 30-40 μm. The main types of macroscopic textures are α texture and α^* texture ({114}〈481〉、{113}〈361〉), together with some weak Gaussian texture{110}〈001〉. The best process selected through laboratory research is decarburization annealing at 850 ℃ for 7 min. The macroscopic texture of the industrial production line after decarburization annealing is the same as that of the decarburization annealed one in laboratory. When the average grain size is about 30 μm after decarburization annealing, the lowest iron loss is 0.80 W/kg, and the magnetic induction intensity reach 1.93 T.