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Calculation of AlN and mns precipitation in Non-Oriented Electrical Steel Produced by CSP Process

Journal of Iron and Steel Research International 2008年第5期15卷 88-94页

作者： XIANG Li YUE Er-bin FAN Ding-dong QIU Sheng-tao ZHAO Pei State Key Laboratory of Advanced Steel Processing and Products National Engineering Research Center of Continuous Casting Technology Central Iron and Steel Research Institute Beijing 100081 China

Combining with the study of analogue experiments and test analysis, the kinetics of precipitation and growth of AlN and mns in non-oriented electrical steel produced by the CSP process is calculated. The results show that the precipitate phase particles of AlN and mns in typical non-oriented electrical steel grades produced by the CSP process have grown to some extent in the soaking stage, but the precipitation contents are less than 20% of the total contents of nitride and sulfide. The precipitate phase particles of AlN and mns have precipitated almost after the hot rolling process. The precipitation contents are more than 80% of the total contents of nitride and sulfide, but it is very late for the precipitate phase particles to grow at the end of the hot rolling process.

关键词： CSP non-oriented electrical steel calculation AlN precipitation mns precipitation

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Analysis of precipitation behavior of mns in sulfur-bearing steel system with finite-difference segregation model

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Journal of Iron and Steel Research International 2018年第8期25卷 803-812页

作者： De-lin Hu Hui Liu Jian-bo Xie Juan Cheng Jian Li Jian-xun Fu State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering Shanghai University Shanghai 200444 China

To further reveal the influence of micro-segregation on the precipitation behavior of mns in sulfur-bearing steel system, a coupled model of micro-segregation and mns precipitation was established by the finite-difference method based on various calculation domains and the solid diffusion degrees, and a new controlled diffusion equation with more stable convergence was also used. 49MnVS3 and 1215 steels were used to analyze the influence of calculation domain, segregation model and S content on the precipitation behavior of mns. The calculation results were verified by a high- temperature confocal laser scanning microscope （HT-CLSM）. The results show that the domain has little effect on the precipitation temperature, precipitation solid fraction and precipitation amount of mns, but affects the precipitation location and segregation of the solutes. For low- and medium-sulfur steels, the temperatures calculated by the diffusion control growth （DCG） model and the Lever model were nearly identical, whereas the temperature calculated by the Scheil model was lower. However, for high-sulfur steels, the precipitation temperatures calculated by three segregation models were nearly same. The precipitation solid fraction is more reasonable to describe the precipitation behavior of mns. The precipitation behavior of mns, observed by the HT-CLSM, matches well with that in the DCG model.

关键词： mns precipitation Micro-segregation Mathematical model Solidification In situ observation

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