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利用薄板坯连铸连轧工艺和控轧与控冷工艺,生产了低碳微合金高强度钢。利用光学显微镜、扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析了该钢的微观组织结构。该钢主要由精细的针状铁素体、粒状贝氏体和多边形铁素体组成。铁素体和贝氏体组织中存在由位错形成的胞状亚结构,这有利于晶粒细化。薄板坯连铸连轧工艺生产的低碳微合金高强度钢具有良好的综合力学性能。其屈服强度达到了600 MPa级,伸长率大于20%。
The use of thin slab casting and rolling process and controlled rolling and controlled cooling process, the production of low-carbon micro-alloy high-strength steel. The microstructure of the steel was analyzed by optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The steel is mainly composed of fine acicular ferrite, granular bainite and polygonal ferrite. Ferritic and bainitic structures exist in dislocations formed by the cellular sub-structure, which is conducive to grain refinement. The low-carbon micro-alloy high-strength steel produced by the thin slab continuous casting and rolling process has good comprehensive mechanical properties. Its yield strength reached 600 MPa grade, elongation greater than 20%.