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采用Gleeble-1500D热模拟机进行热模拟实验和轧制实验,研究了添加0.02%Nb对仿晶界型铁素体(F_(GBA))/粒状贝氏体(B_G)复相空冷钢相变及力学性能的影响.结果表明,0.02%Nb使该钢的连续冷却转变曲线右移,淬透性增加;0.02%Nb抑制了γ→α相变,细化了仿晶界铁素体,促进了粒状贝氏体转变,细化了粒状贝氏体及其内部的铁素体片条及马氏体-奥氏体(M-A)岛.与不含Nb的F_(GBA)/B_G复相钢相比,由于组织细化及强化相体积分数的提高,含0.02%Nb的复相钢经轧后空冷后抗拉强度上升了157 MPa,屈服强度增加了93 MPa,强化效果显著.分析了添加0.02%Nb使复相钢的组织细化及强化相体积分数增加的原因.
Thermal simulation experiments and rolling experiments were carried out on a Gleeble-1500D thermal simulator. The effects of the addition of 0.02% Nb on the phase transformation of the intergranular ferrite (F_GBA) / granular bainite (B_G) The results show that the continuous cooling transformation curve of 0.02% Nb increases to the right and the hardenability increases. 0.02% Nb suppresses the γ → α phase transformation and refine the grain boundary ferrite, The granular bainite transformation was refined to refine the granular bainite and its ferrite strip and martensite-austenite (MA) islands. Compared with the Nb-free GB / B-G duplex steel Compared with the control, the tensile strength of the multi-phase steel containing 0.02% Nb increased by 157 MPa and the yield strength increased by 93 MPa after air-cooling by rolling due to the refinement of the microstructure and the increase of the volume fraction of the reinforcing phase. The reason why 0.02% Nb makes the microstructure of the duplex steel increase and the volume fraction of the reinforcing phase increases.