Effects of Hot Band Annealing on the Secondary Recrystallication Behaviors of Vanadium Added Grain Oriented Electrical Steels

• Main Authors: Shih-wen Liao, 廖士文
• Other Authors: Chun-kan Hou
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/03116076816249709634

碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 95 === Grain oriented electrical steel is an important function magnetic material. It has excellent permeability during magnetization. Grain oriented electrical steel is usually used to make the transformer cores. It’s magnetic properties affecting the energy efficiency of electric machinery. Proper size and distribution of inclusions can impede the normal grain growth during primary annealing and let the preferred Goss grain grow during secondary recrystallization. After hot band annealing, it was found that the volume fraction of recrystallized grain increases with increasing annealing temperature. It was also found Si3N4 and V2C precipitates existed in the matrix. Nitrogen content in the steel sheet increases with increasing annealing temperature and decarburization influence it, too. The best induction(B8) was obtained when the nitrogen content in the steel sheet was 200-320ppm. After primary recrystallization annealing and nitriding, AlN and vanadium carbide was found. The grain growth was inhibited by these precipitates. Different materials and inhibitors affect the Goss texture development during secondary recrystallization. Stable secondary recrystallization and the best magnetic properties are obtained for the specimens annealing at 1150℃ in hot band stage.