利用热膨胀仪研究了两种不同铌含量的高等级多边形铁素体-贝氏体抗大变形管线钢过冷奥氏体连续冷却转变行为,绘制了静态CCT曲线,分析和比较了两种试验钢的显微组织、显微硬度值和静态CCT曲线。结果表明,冷速为0.027 8～42.5℃.s-1时,先后出现多边形铁素体、珠光体和贝氏体;铌一方面会抑制多边形铁素体相变,不利于控制铁素体组织的含量,另一方面又会阻止其长大,有利于细化铁素体晶粒;铌会抑制粒状贝氏体转变,使CCT曲线明显向右移动,提高多边形铁素体、贝氏体的转变开始温度,缩小多边形铁素体转变温度范围,扩大贝氏体转变温度范围。
The CCT behaviors of two bearing Nb polygonal ferrite-bainite high strength and high-deformability pipeline steels were studied in undeformed condition,The static CCT curves were constructed.The static CCT curves,microstructures and microhardness of two experimental steels were compared.It was found that microstructures of these steels contain polygonal ferrite,pearlite,bainite as cooling rate from 0.027 8 to 42.5 ℃·s-1;Addition of Nb in the steel retards polygonal ferrite and granular bainite transformation,suppresses ferrite growth and refine ferrite grain,makes transformation line of bainite right shift,narrows the range of cooling rate of ferrite transformation,raises start temperature of ferrite and banite transformation;ferrite transformation zone is narrowed and the bainite transformation zone is expanded with increasing of Nb.
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