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A simple route for preparation of TRIP-assisted Si-Mn steel with excellent performance using direct strip casting

International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2173-2181页

作者： Hui Xu Lejun Zhou Wanlin Wang Yang Yi School of Metallurgy and Environment Central South UniversityChangsha 410083China National Center for International Research of Clean Metallurgy Central South UniversityChangsha 410083China

The complex producing procedures and high energy-consuming limit the large-scale production and application of advanced high-strength steels(AHSSs).In this study,the direct strip casting(DSC)technology with unique sub-rapid solidification characteristics and cost advantages was applied to the production of low-alloy Si-Mn steel with the help of quenching&partitioning(Q&P)concept to address these *** this method with the conventional compact strip production(CSP)process,the initial microstructure formed under different solidification conditions and the influence of heat treatment processes on the final mechanical properties were *** results show that the initial structure of the DSC sample is a dual-phase structure composed of fine lath martensite and bainite,while the initial structure of the CSP sample consists of pearlite and *** volume fraction and carbon content of retained austenite(RA)in DSC samples are usually higher than those in CSP samples after the same Q&P *** samples typically demonstrate better comprehensive mechanical properties than the CSP *** DSC sample partitioned at 300℃ for 300 s(DSC-Pt300)achieves the best comprehensive mechanical properties,with yield strength(YS)of 1282 MPa,ultimate tensile strength(UTS)of 1501 MPa,total elongation(TE)of 21.5%,and product of strength and elongation(PSE)as high as 32.3 GPa·%.These results indicate that the excellent mechanical properties in low-alloy Si-Mn steel can be obtained through a simple process(DSC-Q&P),which also demonstrates the superiority of DSC technology in manufacturing AHSSs.

关键词： direct strip casting sub-rapid solidification quenching and partitioning TRIP-assisted AHSSs microstructure

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Research status and prospect of direct strip casting manufactured lowcarbon microalloyed steel

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Journal of Iron and Steel Research(International) 2022年第1期29卷 17-33页

作者： Shuai Xu Shao-hua Li Shui-ze Wang Jun-heng Gao Rui Cao Qing-xiao Feng Hua-long Li Xin-ping Mao Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Jiangsu(ShaGang)Iron and Steel Research Institute Zhangjiagang 215625JiangsuChina

direct strip casting(DSC)is one of the cutting-edge technologies for the steel industry in the twenty-first *** the background of carbon peak and carbon neutrality,DSC technology has a bright future of applications as it requires less production time and space with reduced energy *** to its sub-rapid cooling rate during solidification and low reduction during hot rolling,DSC process exhibits a series of unique physical metallurgy *** process characteristics of DSC process and the microstructural evolution during the thermomechanical processing of low-carbon microalloyed steel are *** effects of hot rolling,cooling,coiling temperatures and microalloying elements on the microstructure and mechanical properties are then ***,the future development orientations of DSC technology are suggested to fully utilize its unique features for the enhancement of its competitiveness and for the promotion of carbon neutrality of the steel industry.

关键词： direct strip casting Low-carbon microalloyed steel Hot rolling Coiling Acicular ferrite

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