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以低碳Nb、V、Ti、Mo和Cr合金化贝氏体钢为研究对象,在Formaster-Digital膨胀仪上测定了过冷奥氏体的静态CCT曲线;在Gleeble-1500热/力模拟机上,用膨胀法测定了奥氏体的动态CCT曲线;采用扫描电镜和透射电镜分析了贝氏体钢的室温组织演变规律.结果表明:合金元素抑制奥氏体向铁素体转变,在冷却速度大于10℃.s-1的范围内,静态CCT和动态CCT的室温组织均为贝氏体,具有较高的强度;奥氏体变形促进了贝氏体转变,贝氏体转变开始温度为610～668℃,终了温度为520～551℃.
Taking the low carbon Nb, V, Ti, Mo and Cr alloying bainitic steels as the research object, the static CCT curves of supercooled austenite were measured on the Formaster-Digital dilatometer. On the Gleeble-1500 thermal / , The dynamic CCT curve of austenite was measured by the dilatometric method.The microstructure evolution of bainitic steel at room temperature was analyzed by scanning electron microscopy and transmission electron microscopy.The results show that alloying elements inhibit the transformation from austenite to ferrite and the cooling rate In the range of more than 10 ℃ .s-1, the room temperature microstructure of static CCT and dynamic CCT are bainite with high strength; austenite deformation promotes bainite transformation, and the bainite transformation start temperature is 610 ~ 668 ℃, the final temperature is 520 ~ 551 ℃.