COMPOSITION AND STRUCTURE OF PRODUCTS FROM HIGH-SPEED STEEL IMPACT-CENTRIFUGAL SPINNING

General evaluation has been applied to the products from impact-centri fugal spinning for high-speed steels of R6M5 type by chemical analysis , microprobe, x-ray diffraction, optical and scanning electron microsc opy, and microhardness measurement. These products are mixtures of sca ly or flaky particles (2 x 0.4 x 0.04 mm), large (2-8 mm) equiaxial fr agments, and small (0.5 mm) equiaxial particles, which include spheric al ones. The scales have higher contents of carbon and carbide-forming elements than do the initial materials, while the large fragments hav e lower ones. The elements are unevenly distributed in the scales. The re are parts differing in chemical composition. These parts are formed in the scales because of concentrational inhomogeneities in the initi al alloy. The thickness of a scale varied monotonically along the leng th, which leads to differences in cooling rate and consequently to inh omogeneities in phase composition after recrystallization.