材料科学技术(英文版)2022，Vol.99Issue(4) ：277-287.

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

Hao Guo Shufeng Yang Tiantian Wang Hang Yuan Yanling Zhang Jingshe Li
材料科学技术(英文版)2022，Vol.99Issue(4) ：277-287.
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  • NETL
  • NSTL
  • 维普
  • 万方数据

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

Hao Guo 1Shufeng Yang 2Tiantian Wang 2Hang Yuan 2Yanling Zhang 3Jingshe Li2
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作者信息

  • 1. State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Special Melting and Preparation of High-end Metals,University of Science and Technology Beijing,Beijing 100083,China;Department of Materials Engineering,KU Leuven,Kasteelpark Arenberg 44,3001 Leuven,Belgium
  • 2. Beijing Key Laboratory of Special Melting and Preparation of High-end Metals,University of Science and Technology Beijing,Beijing 100083,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China
  • 3. State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China
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Abstract

To investigate the effect of surface-modified nanoparticles(NPs)on the inclusion refinement and mi-crostructure evolution,deoxidized experiment ingots with different amounts of modified NPs were man-ufactured under different cooling conditions.Laser scanning confocal microscope(LSCM)was hereby used for in-situ observation of the phase transition and microstructural evolution during heat cycle process.The 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 quenching.After NP addition,the nucle-ant inclusions were identified as MgAl2O4 spinel and irregular TiN inclusion from SEM-EDS measurement and equilibrium calculations using Factsage thermodynamic software.The higher cooling rate under water quenching resulted in less polygonal ferrite decrease and the formation of bainite in the steel.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 addition.The higher cooling rate and NP addition contributed to AF formation and increased the degree of interlocking of the AF phase.Finally,the relationship between the characteristics of inclusions and the kinetics of AF was investigated.

Key words

Surface-modified nanoparticles/Laser scanning confocal microscopy/Inclusion-engineered steel/Microstructure evolution/Acicular ferrite nucleation

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基金项目

National Natural Science Foundation of China(51874024)

National Natural Science Foundation of China(51734003)

Fundamental Re-search Funds for the Central Universities(FRF-TP-18-009C1)

出版年

2022
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
被引量1
参考文献量58
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