Research progress on nano-scale interphase precipitation behavior of microalloyed high-strength steel
YANG Hong-bo1, WANG Hao1, ZHAO Xu1, QI Wei-wei2, LIU Hong-yin2, SUN Jian-wei2
1. School of Metallurgical Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, Shaanxi, China; 2. Technical Center, Laiwu Branch of Shandong Iron and Steel Co., Ltd., Jinan 271100, Shandong, China
Abstract：Increasing strength without reducing toughness is the goal that people pursue in the research and development process of high-strength steel. Compared with other strengthening methods, grain refinement can increase the strength and toughness of the material at the same time,but the minimum grain size of steel materials can be controlled to 3-5 μm now,and the strengthening effect that can be brought about is limited. A new type of ferrite-based high-strength steel has been developed in the past ten years. Through interphase precipitation,the ferrite matrix is distributed with regularly arranged nano-sized carbides,which greatly improves the toughness,formability and weldability,and is widely used in the field of construction machinery,oil pipelines,auto parts and high-rise buildings.With the development of the iron and steel industry in recent years,the understanding of the interphase precipitation has become more and more in-depth. There have been a large number of reports on the nanophase precipitation characteristics of various microalloyed steels,mainly focusing on the study of the microstructure characteristics and strength contributions of the precipitates. However,there are still many disputes about the interphase precipitation mechanism and model. It is still difficult to achieve stable interphase precipitation through process control,and the performance stability of nanophase precipitation of high-strength steel is still poor. With the development of science and technology,relevant advanced analytical instruments are also being updated, providing conditions for in-depth research on the precipitation behavior of nano-scale carbide phases in new ferrite-based high-strength steels. Based on this,the domestic and foreign research developments on the precipitation of nano-scale carbides in ferrite-based high-strength steels were reviewed,and clarifies the limitations of step theory and solute consumption theory;the composition design of ferrite-based high-strength steels was analyzed. The influence of the alloying method on the interphase precipitation behavior was revealed;the current international advanced instruments and technologies for studying the interphase precipitation behavior of nano-scale carbides were introduced. Finally,the development of the new ferrite-based high-strength steel was prospected,and the advantages of composite microalloying will be the inevitable trend of microalloying steel development in the future.
杨洪波, 王豪, 赵旭, 亓伟伟, 刘洪银, 孙建卫. 微合金高强钢纳米相间析出行为研究进展[J]. 钢铁, 2021, 56(12): 10-21.
YANG Hong-bo, WANG Hao, ZHAO Xu, QI Wei-wei, LIU Hong-yin, SUN Jian-wei. Research progress on nano-scale interphase precipitation behavior of microalloyed high-strength steel[J]. Iron and Steel, 2021, 56(12): 10-21.
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2021, Vol. 56 
