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题名: The Experimental Characterization and Numerical Simulation of A-Segregates in 27SiMn Steel
作者: Cao, Y. F.;  Chen, Y.;  Fu, P. X.;  Liu, H. W.;  Li, D. Z.
发表日期: 2017-5-1
摘要: A 500-kg 27SiMn steel ingot has been produced via low-oxygen purifying technology and then fully dissected in the longitudinal center plane to investigate the typical features and formation mechanism of A-segregates. The macrostructure, microstructure, inclusions, cavity and solute segregation surrounding the A-segregates were characterized and analyzed in detail. It shows that the main solute components such as C, Si, and Mn, and even some large cavities accumulate obviously within the A-type channels. Owing to the low content of oxygen and other impurities, there is no apparent enrichment of the inclusions. Based on the classical theory of macrosegregation, driven by thermo-solutal buoyancy, A-segregates in the body of a 27SiMn steel ingot have been simulated successfully by using the multi-component continuum model. They disappear in a referred 1045 steel ingot. By comparing the evolution processes during solidification of both steels, it is demonstrated that the strong thermo-solutal convection originated from the high content of Si element in 27SiMn steel destabilizes the mushy zone and therefore induces the A-segregates. In terms of the occurrence zones of A-segregates and corresponding distributions of Rayleigh number, its critical value to predict the A-segregates in industrial steel ingots was proposed and then applied successfully.
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Recommended Citation:
Cao, Y. F.,Chen, Y.,Fu, P. X.,et al. The Experimental Characterization And Numerical Simulation Of A-segregates In 27simn Steel[J]. Metallurgical And Materials Transactions A-physical Metallurgy And Materials Science,2017,48a(5):2260-2273.

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