Investigation on Internal Defects of Stainless Steel Strip by Twin-roll Concasting
The internal defects of 2 mm-width strip produced by twin-roll caster was studied.It is found that the main problems are the shrinkage porosity and cracks between columnar zone and equiaxed zone.These defects were analyzed by metallographic inspection and EBSD texture analysis.The results show that finer equiaxed grains between columnar and equiaxed zone are evolved from broken dendrites,and semisolid structure in the equiaxed zone in the strip center is erified as well.Finally,from the viewpoint of semisolid steel rolling,the formation mechanism of internal defects in as-cast strip was discussed.