Influence of Rolling Reduction on Secondary Recrystallization and Magnetic Properties in Strip‐Cast Grain‐Oriented 4.5%Si Steel. Issue 4 (29th September 2016)

• Record Type: Journal Article
• Authors: Lu, Xiang; Fang, Feng; Zhang, Yuanxiang; Wang, Yang; Yuan, Guo; Xu, Yunbo; Cao, Guangming; Misra, R. Devesh K.; Wang, Guodong
• Is Part Of: Steel research international. Volume 88:Issue 4(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-09-29
• Subjects: grain‐oriented 4.5% silicon steel -- strip‐cast -- secondary recrystallization -- microstructure -- texture; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201600255
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : Grain‐oriented 4.5%Si steel is processed by strip casting and two‐stage rolling with second rolling reduction varied from 53.3 to 82.7%. The microstructure and texture evolution are studied with emphasis on the effect of second rolling reduction on secondary recrystallization. After secondary annealing, significant abnormal grain growth occurs for all reductions in the range of 53.3–82.7%. The underlying reason is the strong inhibiting force induced by additional Nb, and the grain diameter of the secondary grains increase with increased rolling reduction. Additionally, the sharpness of secondary grains to ideal Goss orientation increase with increase in second rolling reduction. This is attributed to decreased inhibiting force drop rate between abnormal grain growth of precise Goss and deviated Goss grains with increased rolling reduction. Another interesting aspect is enhancement of magnetic induction B8 and significant reduction in high frequency (400–1000 Hz) core losses with increase in second rolling reduction. Optimal magnetic properties are obtained in the steel subjected to 82.7% rolling reduction. The present study suggests that strip casting is an effective approach to fabricate grain‐oriented high silicon steel, especially thin‐gauged steels with superior magnetic properties. Abstract : Grain‐oriented silicon steel containing 4.5 wt%Si is successfully developed by strip casting, and the effect of second rolling reduction on secondary recrystallization and magnetic properties is studied in detail. The results indicate that increasing second rolling reduction leads to the increase in sharpness of secondary grains to ideal Goss orientation, and therefore significantly optimizes the magnetic properties.