Anomalous texture developments, new two-dimensional primary growth modeling, and fully (001)-textured electrical steels

초록

Various anomalous texture developments have been investigated in C-free and AlN-free electrical sheets, and new two-dimensional (2D) primary growth modeling has been carried out to understand them. In one-stage coldrolled sheets, the primary (001) texture pole intensity (TPI) increases with decreasing bulk sulfur content and sheet thickness. The high-index (hkl) and (001) TPIs increase concurrently with increasing annealing time. In other case, the (001) TPI increases to a maximum after which it rather decreases. In two-stage cold-rolled sheets showing the primary (001)+(110) texture, the (001) TPI increases with decreasing sheet thickness and secondstage cold-rolling ratio (CRR). The final (001) grain size is determined by the combination between sheet thickness, bulk sulfur content, CRR, heating rate, and MnS precipitation reaction. New 2D primary growth modeling supports strongly that the higher surface energy grains as well as the lower surface energy ones can grow, although their growth is transient and peripheral. Several unique concepts implied in the 2D growth maps well explain the various anomalous texture developments. The (111) island grains in electrical sheets fully (00 1)-textured after final annealing are always consumed with further annealing, regardless of the grain size. However, the (110) island grains may grow or not, which depends on the grain size and the number of neighboring ones. Fully developed (110)[001] Goss or (001) texture can be obtained from electrical sheets of the same composition, depending on the processing variables. Fully (001)-textured electrical sheets of high magnetic properties were developed through the experimental results and the 2D growth modeling.

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