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Microstructure evolution and acicular ferrite nucleation in inclusion-engineered steel with modified MgO@C nanoparticle addition

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Journal of Materials Science & Technology 2022年第4期99卷 277-287页

作者： Hao Guo Shufeng Yang Tiantian Wang Hang Yuan Yanling Zhang Jingshe Li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Special Melting and Preparation of High-end Metals University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Materials Engineering KU LeuvenKasteelpark Arenberg 443001 LeuvenBelgium

To investigate the effect of surface-modified nanoparticles(NPs)on the inclusion refinement and microstructure evolution,deoxidized experiment ingots with different amounts of modified NPs were manufactured under different cooling *** scanning confocal microscope(LSCM)was hereby used for in-situ observation of the phase transition and microstructural evolution during heat cycle *** results revealed that the inclusion size was always smaller under water quenching than under air cooling,and the number of inclusions was greater under water *** NP addition,the nucleant inclusions were identified as MgAl_(2)O_(4)spinel and irregular TiN inclusion from SEM-EDS measurement and equilibrium calculations using Factsage thermodynamic *** higher cooling rate under water quenching resulted in less polygonal ferrite decrease and the formation of bainite in the *** LSCM experiments showed that ferrite side plates(FSP)always formed on the boundary prior to the formation of acicular ferrite(AF)on the intragranular inclusions,and the start transformation temperatures of FSP and AF phases both lowered after NP *** higher cooling rate and NP addition contributed to AF formation and increased the degree of interlocking of the AF ***,the relationship between the characteristics of inclusions and the kinetics of AF was investigated.

关键词： Surface-modified nanoparticles Laser scanning confocal microscopy Inclusion-engineered steel Microstructure evolution acicular ferrite nucleation

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