Ken Makita and Osamu Yamashita
Research & Development Department, Sumitomo Special Metals Co., Ltd., Osaka 618-0013
Fe-6.2%Si sintered body with an average grain size of 50 μm has been synthesized by a powder metallurgy method. Mixture of carbonyl iron powder and the jet-milled powder of Fe-50%Si alloy ingot was spray-dried using polyvinyl alcohol as a binder. Slabs with a thickness of 1 mm were obtained by sintering the green compacts at 1160°C for 5 h under vacuum. These slabs were successfully cold-rolled to sheets with a thickness of 0.1 mm at room temperature without being annealed. The X-ray pole figures of cold-rolled sheets with reduction rate more than 90% revealed (100) texture, while the recrystallized texture after annealing at 1100°C was (111). The magnetic properties of stamped ring after annealing were μm: 10500, B8: 1.25 T, Br: 1.11 T, Hc: 30 A/m, respectively. The extreme ductility of 1 mm thick slabs may be due to both reduced grain size of the sintered body and the adequate balance between pressure stress and tensile stress during cold-rolling.
(Received April 26, 1999; In Final Form June 14, 1999)
silicon steel sheets, powder metallurgy, X-ray pole figure, rolled texture, soft magnetic properties
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