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Precipitates and Hydrogen Permeation Behavior in Vanadium-Bearing Microalloyed Low Carbon Steel

Journal of Iron and Steel Research International 2011年第S1期18卷 290-295页

作者： XU Chun,LI Xiao-jie,SHEN Da-guang (Material Engineering Department,Shanghai Institute of Technology,Shanghai 200233,China) Shanghai Inst Technol Dept Mat Engn Shanghai 200233 Peoples R China

The precipitates and hydrogen permeation behavior were studied in the low carbon steel for *** the preparation of samples,Ti containing and Ti free in vanadium-bearing microalloyed low carbon steel heating at 750℃ for 3 h,were adopted after *** was found that the a large number of fine VC,TiC,TiN and Ti 4 C 2 S 2 precipitates were in samples of Vanadium-bearing microalloyed low carbon steel with Ti *** fine VC,Fe 3 C and MnS precipitates were in steels without Ti *** the numbers of precipitates in the former is more bigger than the *** activation energies for hydrogen diffusion in both samples are 26.5 and 23.7 kJ/mol,*** at 25℃,the effective diffusion coefficients in the samples for Ti containing and Ti free in Vanadium-bearing microalloyed low carbon steel were measured as 2.71×10-6 and 4.22×10-6 cm 2 /s,*** fishscaling defect occurred in the former and heavy fishscaling defect in the later.

关键词： precipitate hydrogen permeability enameling vanadium-bearing microalloyed low carbon steel

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Analysis of Fishscaling Resistance of Low Carbon Heavy Plate Steels

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Journal of Iron and Steel Research International 2014年第4期21卷 469-475页

作者： Ai-wen ZHANG Zheng-yi JIANG Dong-bin WEI Si-hai JIAO Chun XU Faculty of Engineering University of WollongongWollongong 2522NSWAustralia Research Institute Baoshan Iron and Steel Co.Ltd. Department of Material Science and Engineering Shanghai Institute of Technology

The precipitates and hydrogen permeation behavior in three kinds of hot rolled low carbon heavy plate steels for enameling were analyzed; then, both sides of the steels were enameled. The experimental results show that a large amount of coarse Ti4 Cz $2 and fine Ti（C, N） particles exist in the optimized Ti-bearing steel, quite a lot of fine Ti（C,N） particles exist in the optimized carbon steel, but only a little bit fine Ti（C,N） particles exist in the carbon steel. The fishscaling resistance of the steels can be correlated to the effective hydrogen diffusion coefficient, and a model of correlation between the effective hydrogen diffusion coefficient and the volume fraction of the precipitates was established and verified. The effective hydrogen diffusion coefficient should be lower than 3.96×10-6 cm2/s to avoid fishscaling in heavy plate steels.

关键词： fishscaling resistance hydrogen permeation precipitate enameling

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