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金属学报  2010 

0.02%Nb空冷仿晶界型铁素体/粒状贝氏体复相钢的相变及强韧性

DOI: 10.3724/SP.J.1037.2009.00646, PP. 473-478

Keywords: 粒状贝氏体,相变,强韧性,微量Nb,空冷

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Abstract:

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(FGBA)/粒状贝氏体(BG)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FGBA/BG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157MPa,屈服强度增加了93MPa,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.

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