Abstract：Aiming at microstructure refinement problems in steel plates, tubes and profiles under hot-rolling or welding conditions, a systematic study of theory-technology-product was carried out. Through the development of existing technology and innovation, a new type intrinsically fine-grained steel technology based on precipitation control was proposed. Through the whole process control of smelting-casting-rolling-cooling-welding, distribution of thermostable micro-nano particles in steel was regulated. In combination with optimized process, the matrix and welding microstructure was uniformly refined. It broke through the limitation in microstructure control methods and process conditions, improved the comprehensive performance, and promoted green manufacturing of advanced steels. The precipitation laws of some nitride and oxide were analyzed using thermodynamics calculation software. Typical precipitation particles were characterized with an electron probe micro-analyzer (EPMA) and a scanning electron microscope (SEM). The design concept of composite precipitates was explained from the perspective of thermal stability and their interaction with the matrix. Mn-depletion zone and coherent interface mechanism for particle-induced ferrite nucleation was discussed. Transformation behavior of intragranular ferrite was studied using high-temperature in-situ characterization technology. The multiple microstructure refinement mechanism based on multi-type and multi-scale precipitation system was elaborated. The technology has been applied to high heat input welding steel, efficient hot-rolling of structural steel, hot-rolled seamless steel tubes and low-cost hot-rolled ribbed bars. The technology has achieved good results and demonstrates a broad application prospect in more product fields.
王超, 袁国, 王国栋. 基于析出相控制的热轧本质细晶钢技术及应用[J]. 钢铁, 2023, 58(9): 167-177.
WANG Chao, YUAN Guo, WANG Guodong. Hot-rolled intrinsically fine-grained steel technology based on precipitation control and its application[J]. Iron and Steel, 2023, 58(9): 167-177.
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