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采用低碳Cr-Mo系添加微量强碳化物形成元素的成分设计,通过TMCP工艺控制,获得均匀铁素体/贝氏体组织,充分发挥析出强化、细晶强化和贝氏体组织强化作用,研制80 mm厚高韧性工程机械用Q460钢。试制钢板力学性能均匀,不仅具有良好的拉伸力学性能,且低温冲击韧性优良,-60℃冲击功大于180 J,冲击断口呈明显塑性变形;SEM分析表明,断口微观形貌韧窝特征明显,面积约为55%,韧窝内圆形氧化物夹杂细小;钢板厚度方向铁素体/贝氏体组织均匀,晶粒尺寸约为8～10μm;TEM分析表明,晶内存在高密度位错,大量细小弥散的第二相粒子沿位错线析出。
The low carbon Cr-Mo system is used to add trace amount of strong carbide to form the elemental composition. Through the TMCP process control, the uniform ferrite / bainite structure is obtained, the precipitation strengthening, fine grain strengthening and bainite strengthening are fully exerted, Development of 80 mm thick high toughness construction machinery Q460 steel. Experimental mechanical properties of steel plate uniform, not only has good tensile mechanical properties, and low temperature impact toughness, -60 ℃ impact power is greater than 180 J, the impact fracture was significantly plastic deformation; SEM analysis shows that the micro-morphology of the dimples feature obvious, The area is about 55%, and the inclusions in the dimples are small; the ferrite / bainite in the thickness direction of the steel plate is uniform and the grain size is about 8-10μm; TEM analysis shows that there are high density dislocations, A large number of finely dispersed second-phase particles along the dislocation line precipitation.