1Cr18Ni9Ti不锈钢的半固态流变浆料的直接轧制  

Direct Rolling of Semi-Solid Rheological Slurry of 1Cr18Ni9Ti Stainless Steel

作　　者：赵爱民[1] 康永林[1] 毛卫民[1] 高军芳[1] 张乐平[1] 焦殿辉[1] 李具仓[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100081

出　　处：《钢铁研究学报》2004年第6期27-32,共6页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(59995440;50174003)

摘　　要：采用电磁搅拌制备出含球状固相的1Cr18Ni9Ti不锈钢半固态流变浆料,并将这种浆料直接轧制成厚度为2～5mm板材,然后观察分析了不同尺寸轧件的微观组织。结果表明:固相分数为0 3～0 6的半固态流变浆料具有较好的流动性,在重力作用下,流变浆料可以从电磁搅拌器输送至轧机进行直接轧制。但在轧制过程中会产生液相偏析和固相颗粒的塑性变形。沿轧件宽度和厚度边缘液相分数高,中心部位液相分数低;小尺寸轧件的液相偏析程度较小,而大尺寸轧件的液相偏析程度大;大尺寸轧件中心的固相颗粒发生了一定程度的塑性变形,沿着轧制方向,固相颗粒明显拉长。这说明在轧制变形过程中,半固态流变浆料的液相和固相颗粒流动速度不同,液相的流动速度快,当中心部位的固相分数增加到一定值时,固相颗粒将发生塑性变形。The direct rolling process of the semi-solid rheological slurry of 1Cr18Ni9Ti stainless steel prepared by electromagnetic stirring was studied. The microstructures of the rheological slurry and the rolled strips were observed using the microscope and SEM. Results show that the rheological slurry of 1Cr18Ni9Ti stainless steel produced by electromagnetic stirring contains dispersed globular solid particles with the size of 100-200 μm and the solid phase volume fraction of 0.3-0.6. The slurry with such high solid phase volume fraction of 0.3-0.6 still has good fluidity, and can be transported to the mill from the electromagnetic stirrer for direct rolling. The segregation of liquid phase and the plastic deformation of solid particles in the slurry occur during semisolid rolling. The liquid fraction at the edge of strips is higher than that at the center in both directions of width and thickness. Serious liquid segregation exists in the large-sized rolled piece. The plastic deformation of solid particles takes place at the center of the large-sized rolled piece, the globular solid particles elongate in the rolling direction and they are changed into elliptic solid particles. The results prove that the liquid phase and solid phase in the slurry have different flow rate during the semi-solid rolling, the flow rate of the liquid phase is higher than that of the solid phase and more solid particles are left at the center of strip. When the solid phase volume fraction gradually increases to some value, the mutual contact of solid particles will occur, net structure will be formed and free movement of solid particle is stopped. Then the plastic deformation of solid particles starts in the latter stage of the rolling process.

关 键 词：1CR18NI9TI 不锈钢 电磁搅拌 凝固 流变浆料 直接轧制 

分 类 号：TG249[金属学及工艺—铸造]