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2～5 mm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.
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