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        Solidification Structure and Segregation of High Magnetic Induction Grain-Oriented Silicon Steel

        Xin Li,Min Wang,YanPing Bao,Jian Gong,Xianhui Wang,Pang Weiguang 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.6

        The solidification structure and centerline segregation of high magnetic induction grain-oriented silicon steel slabs werestudied to describe the characteristics of solidification and compare the degree of centerline segregation of continuouslycast slabs. Industrial experiments were conducted to investigate the solidification behavior of slabs by secondary coolingsegment electromagnetic stirring. Three typical slabs were produced by S-EMS with current intensities of 0, 200, and 350 A. Molten steel cast at a low stirring intensity (0 A) resulted in a coarse structure relative to those cast at higher stirring intensities(200 and 350 A). The centerline segregation of carbon and silicon markedly increased with increases in S-EMS currentintensity. Composition distribution by electron probe microanalysis identified segregation spots as the sources of centerlinesegregation. Experimental results indicate that to optimize the centerline segregation of grain-oriented silicon steel slabs,the columnar crystal zone should be enlarged and the equiaxed crystal zone be reduced.

      • Effect of control route on the unstart/restart characteristics of an over-under TBCC inlet

        Li, Nan,Chang, Juntao,Tang, Jingfeng,Yu, Daren,Bao, Wen,Song, Yanping Techno-Press 2018 Advances in aircraft and spacecraft science Vol.5 No.4

        Numerical simulations have been conducted to study the unstart/restart characteristics of an over-under turbine-based combined-cycle propulsion system (TBCC) inlet during the inlet transition phase. A dual-solution area exists according to the Kantrowitz theory, in which the inlet states may be different even with the same input parameters. The entire transition process was divided into five stages and the unstart/restart hysteresis loop for each stage was also obtained. These loops construct a hysteresis surface which separates the operating space of the engine into three parts: in which a) inlet can maintain a started state; b) inlet keeps an unstarted state; c) inlet state depends on its initial state. During the transition, the operation of the engine follows a certain order with different backpressures and splitter angles, namely control route, which may result in disparate inlet states. Nine control routes with different backpressures and transition stages were designed to illuminate the route-dependent behavior of the inlet. The control routes operating towards the unstart boundary can make the inlet transit from a started state into an unstarted one. But operating backward the same route cannot make the inlet restart, additional effort should be made.

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