EFFECT OF THE INITIAL POWDER AND TREATMENT ON THE STRUCTURE OF OXIDE DISPERSION-STRENGTHENED STEEL

摘要

The results of investigations of the structure and uniformity of the Y_2O_3 distribution in reactor EP-450 (12Kh13M2BFR) dispersion-strengthened ferrite-martensite steel are presented. It is found that electric-pulse plasma sintering of powders of matrix steel and dispersion-strengthening oxides can be one of the methods for fabricating reactor steel. Optical and transmission electron microscopy investigations show that quite uniform grains are formed in a compact and no appreciable porosity is seen visually. Steel with structure in the form of flakes with mechanical alloying time 15 h possesses the best chemical composition with quite uniform Y_2O_3 distribution.