硼对460B钢连续冷却相变行为的影响  

Effect of Boron on Continuous Cooling Transformation Behavior of 460B Steel

作　　者：陈连生[1] 沈永革[1] 宋进英[1] 卢珺玮[1] 杨子旋[1] 田亚强[1] 

机构地区：[1]河北联合大学河北省现代冶金技术重点实验室,河北唐山063009

出　　处：《钢铁研究学报》2013年第12期47-51,共5页Journal of Iron and Steel Research

摘　　要：采用Gleeble-3500热模拟机单道次压缩变形试验,研究了硼对460B钢的连续冷却转变过程及转变产物组织性能的影响规律。结果表明:硼元素的加入可以使460B钢在3℃/s的冷却速度下发生贝氏体相变,且与不含硼试样相比,在相同的冷速下所获得的板条状贝氏体组织更细小,且在低冷速(0.1、0.3、0.5℃/s)下晶粒略粗大但硬度偏高;硼元素的加入明显使460B钢的动态CCT曲线右移,抑制了奥氏体向铁素体和珠光体的转变,明显增加了钢的淬透性,降低了奥氏体向马氏体转变的临界冷却速度,同时也降低了460B钢的Ac3、Ac1、Ar3、Ar1和Ms点的温度。The continuous cooling transformation process and the organization performance of transformation prod- uct was investigated by means of dilatation test during single pass deformation on Gleeble-3500. The result shows that bainite transition can be happened when the cooling speed about 3 ℃/s on 460B steel with boron, and the grain size is coarse and hardness is higher when the cooling speed （0.1, 0.3, 0.5 ℃/s）is slowly, it is more tiny than without boron. Boron can make the CCT curves shift to right, the transition from austenite to ferrite and pearlite is restrained, the hardenability of the steel are obviously improved, the cooling speed from austenite to martensite is lower and Ac3, Ac1, Ar3, Ar1, Ms is dropped.

关 键 词：硼 460B钢 CCT曲线 

分 类 号：TG142.1[一般工业技术—材料科学与工程]