Influence of Temperature on the Texture Distribution in Two-Phase Region Hot Deformation of Grain-Oriented Silicon Steel
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JMEPEG DOI: 10.1007/s11665-017-2993-z
Influence of Temperature on the Texture Distribution in Two-Phase Region Hot Deformation of Grain-Oriented Silicon Steel Zhi-chao Li, Ning Dang, Hai-tao Jiang, and Zhen-hai Xia (Submitted January 11, 2017; in revised form July 26, 2017) Hot deformation simulation test of 3% Si grain-oriented silicon (CGO) steel was carried out at different temperatures, and evolution of microstructures and recrystallized textures in two-phase region was analyzed by electron backscatter diffraction and optical microscopy. The ‘‘d fi c’’ and ‘‘c fi a’’ phase transformation points of the two-phase region measured by differential scanning calorimetry method are 1272 and 819 °C, respectively, which are within the ranges of 1300-1350 and 800-850 °C, measured by water quenching. The hot deformation temperature has a large effect on the microstructure and texture in the steel. A higher hot deformation temperature leads to higher degree of recrystallization and larger average grain size, more c-fiber textures and cube {100} texture, but the rotated cube {100} texture is stable. The recrystallized microstructure was also affected by the phase compositions. While the cube {100} texture results in typical austenite recrystallization texture, {111} textures lead to typical ferrite rolling textures. Keywords
CGO steel, differential scanning calorimetry microstructure, phase transformation, texture distribution
1. Introduction Grain-oriented silicon steel is one of the most important soft magnetic alloys as core material of transformer in power electronics industry owning to its excellent magnetic properties along rolling direction, high magnetic induction and low iron loss (Ref 1-3). The grain-oriented silicon steel can be classified into conventional grain-oriented silicon (CGO) and high magnetic induction grain-oriented (Hi-B) silicon steels. Compared to Hi-B, CGO silicon steel is cost-effective but relatively low in magnetic induction, and it would be of interest to make CGO comparable to Hi-B steel by improving the performance of CGO silicon steel (Ref 4-6). The hot rolling process of 3% Si CGO silicon steel is carried out in two-phase region—‘‘austenite and ferrite’’ region—in which complex microstructure and texture changes occur. For the better control of the microstructure in the two-phase region during hot rolling, it is essential to understand the evolution of phase structure and morphology of original microstructure. Texture has important effects on the performance of CGO silicon steel, and it is important to accumulate the texture distribution regularity of CGO silicon
Zhi-chao Li, Collaborative Innovation Center of Steel Technology, University of Science and Technology, Beijing, Beijing 100083, China; Ning Dang and Hai-tao Jiang, Institute of Engineering Technology, University of Science and Technology, Beijing, Beijing 100083, China; and Zhen-hai Xia, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203. Contact e-mail: [email protected].
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