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本文在回顾几类典型高强度低合金钢强韧化途径的基础上 ,设计了一种新的复相组织———仿晶界型铁素体 /粒状贝氏体(GBA/Bg) ,并测试了此类复相钢的连续冷却转变规律与轧态力学性能。研究表明 ,试验钢可在较宽的冷速范围内得到这类GBA/Bg复相组织 ,且强韧性配合良好。在未利用贵金属元素、炉外精炼、控轧控冷及热处理的条件下 ,工业试生产得到的1 2mm中厚钢板的力学性能为σb=850MPa,σ0 2 =540MPa ,δ5=1 8% ,AKV(- 4 0℃ ) =34J。作为 80 0～ 1 0 0 0MPa级的高强度结构钢 ,这类钢具有良好的工业应用前景。
Based on the review of the toughening and toughening methods of several types of high strength and low alloy steels, a new complex phase structure, ie, the intergranular ferrite / granular bainite (GBA / Bg) The continuous cooling transformation and rolling mechanics properties of such composite steel were tested. The study shows that the test steel can be obtained within a wide range of cooling rate of such GBA / Bg complex phase, and good toughness with good. The mechanical properties of 1 2mm thick steel plate obtained by industrial trial production are σb = 850MPa, σ0 2 = 540MPa, δ5 = 18% under the condition of not using precious metal elements, furnace refining, controlled rolling and controlled cooling and heat treatment. (-400C) = 34J. As a high-strength structural steel of 80 0 ~ 1 0 0 0MPa grade, this type of steel has good industrial application prospects.