MICROSTRUCTURAL CHARACTERISTICS OF RAPIDLY SOLIDIFIED AUSTENITIC STAINLESS STEEL

Melt-spun Ti-modified 316L stainless steel ribbon exhibits a typical rapid solidification microstructure and homogenious chemical composition. The microstructure consists of fine-scale columnar and equiaxed grains.The cell spacing measured is about 0.2 μm The average cooling rate calculated is 10⁶℃/s. A region of featureless microstructure exists,indicating a high undercooling during solidification.The nucleation undercooling calculated is about 200 K.