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采用超低碳和低Cr、Mo、Ni等的经济型成分设计,研究了控轧、冷却和终冷温度等工艺参数对超高强钢显微组织和力学性能的影响规律。在实验室条件下,可获得抗拉强度1 000 MPa以上,-40℃冲击值148～236J超高强韧性钢板,显微组织以细小的超低碳贝氏体板条为主。富含高密位错和亚结构的上/下贝氏体、较多残余奥氏体薄膜、细小弥散M/A组织和第二相粒子,这对于超高强钢韧、塑性的提高起到关键的作用。在某宽厚板生产线首次实现了1 000～1 200 MPa级高韧性工程机械钢板的工业化生产,并成功应用于矿山机械关键构件的制造。
The ultra low carbon and low Cr, Mo, Ni and other economic components were designed to study the effect of control parameters such as controlled rolling, cooling and final cooling temperature on the microstructure and mechanical properties of ultra high strength steel. Under laboratory conditions, the ultra-high strength and toughness steel plate with the tensile strength of 1 000 MPa and the impact value of -40 ℃ at 148-236 J can be obtained. The microstructure is dominated by the fine ultra-low carbon bainite slab. Upper / lower bainite, more retained austenite films, finely dispersed M / A microstructures and second phase particles rich in high-density dislocations and substructures are crucial for the toughness and ductility of ultra-high strength steels effect. For the first time in a heavy plate production line, the industrial production of engineering machinery steel plates with high toughness ranging from 1 000 to 1 200 MPa has been realized and successfully applied to the manufacture of key components of mining machinery.