Forecast of heat resistance and plasticity of steels and alloys on the base of data on the solid solution state and fine structure

In the case of 12KhM, 15KhM and 12Kh1MF chromium-molybdenum steels, thin or fine structure parameters (e.g. density of dislocations, phase composition, the proportion of alloying elements in a solid solution, size and quantity of carbides have been determined; their influence on the mechanic-al properties has been examined after functioning during 100 thousand hours within the temperature range of 510 to 565 deg C. It has been shown that the greatest influence on the long-term strength and the heat resistance of the steels being examined exert the proportion of molybdenum in the solid solution and the volume proportion of permithe. The strain capacity of the material is determined by the volumetric portion of the strengthening phase, which has been corroborated by the results of examining EI929 heat-resistant nickel alloy. The comparative evaluation of the calculated and experimental values of the plasticity of that alloy has been carried out