冷却模式对板坯连铸微合金钢角部表层组织的影响.pdfVIP

冷却模式对板坯连铸微合金钢角部表层组织的影响1 1 1 1 2 2 2 李云峰 文光华 唐 萍 黎建全 张君详 向成礼 (1. 重庆大学材料科学与工程学院，重庆 400044 ； 2. 攀钢集团攀枝花钢钒有限公司，攀枝花 617000) 摘 要 对传统缓冷模式和控制冷却模式下的铸坯角部组织转变规律进行了研究。结果表明：相对于传统缓冷模式， 在控制冷却模式下，微合金钢板坯角部组织主要受钢中第二相粒子析出行为和回热过程中的相变机制的影响。实验 钢种角部组织在距内弧表面 4mm 以内，其组织转变主要受第二相粒子析出行为的影响，铁素体晶粒细化率达到 67.19%，组织分布较为均匀；当距内弧面深度大于4mm 时，组织转变主要受相变机制的影响，铁素体晶粒细化程 度相对较低，平均细化率为 39.18%，铁素体呈针片状长大趋势。 关键词 连铸 微合金钢 第二相粒子 微观组织 Effect of Cooling Patterns on the Slab Surface Microstructure of Microalloyed Steel Li Yunfeng1 Wen Guanghua1 Tang Ping1 Li Jianquan2 Zhang Junxiang 2 Xiang Chengli2 (1.College of Materials Science and Engineering,Chongqing University, Chongqing, 400044; 2.Pangang Group Panzhihua Steel Vanagium Co., Ltd., Panzhihua, 617000) Abstract The microstructure conversion of the slab surface is investigated under the traditional mild cooling pattern and the control cooling pattern. The results show that compared with the traditional mild cooling pattern, the slab surface microstructure of microalloyed steel is effected by the distribution of the second phase particle contained in the steel and the phase transition mechanism of the reheating process under the control cooling pattern. when the depth ,which is from inside to the surface, is less than 4mm,the microstructure conversion is mainly effected by the distribution of the second phase particle. The rate of ferrite grain refining can reach as much as 67.19% and the surface microstructure is well-distributed; When the depth is more than 4mm, the microstructure conversion is mainly effected by the phase transition mechanism. The rate of ferrite grain refining is comparative