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Si 첨가강의 연속주조공정 신뢰성 향상을 위한 고온변형특성에 관한 연구
옥명렬(Myoung-Ryul Ok),서진유(Jin-Yoo Suh),심재혁(Jae-Hyeok Shim),홍경태(Kyung-Tae Hong),이주동(Joo-Dong Lee),임창희(Chang-hee Yim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
A study was made on the high temperature deformation behavior of Si steel to increase the reliability of continuous casting process. In continuous casting process, the cast slab experiences cooling and deformation simultaneously, and various sources for defect formation exist. Of all these defects, cracking has the most deleterious effect on the property of the cast slab. To avoid or minimize transverse cracking, unbending temperature should be chosen carefully. In general, transverse cracks can easily be formed when unbending temperature lies within the ductility minimum temperature range of hot tensile test. Relative ratio of austenite-ferrite and their distribution or morphology have significant effect on the reliability of unbending process. Moreover, inhomogeneous deformation can be the source of defect formation. So, to produce Si steel by continuous casting, deformation behavior of Si steel as well as the relative ratio of austenite-ferrite or phase transformation temperature(Ar₃) should be known. We carried out hot tensile and hot compression test to evaluate the mechanical properties of the Si steel at high temperature. Hot ductility minimum temperature was not found with all Si contents, but inhomogeneous deformation occurred in high Si(1.17% and 3.21%) samples. It can be concluded that to minimize inhomogeneous deformation is the key to the successful unbending process of silicon steel. To analyze the effect of the silicon on the strength of silicon steel, a model was established, by using rule of mixture.