OBTAINING HIGH-QUALITY PRODUCTS FROM CORROSION-RESISTANT CHROMIUM-NICKEL STEELS
The study of defects that occur in the production of parts from forgings and of chromium-Nickel corrosion-resistant steels. Various types of defects in stampings and forgings that are formed during their deformation and heat treatment, as well as the causes of their occurrence, are studied. In the process of detecting defects, magnetic powder and radiographic methods of non-destructive testing were used. The full cycle of heat treatment of 14X17N2 steel billets and the formed values of mechanical properties at the implemented processing stages are studied. The microstructure of chromium-Nickel martensitic-ferritic steels and the effect of the presence of δ-ferrite on their technological properties during deformation and heat treatment are studied. To avoid the appearance of defects of deformation origin, it is recommended to achieve a more uniform deformation in the volume of the workpiece, which are eliminates the unacceptable localization of stresses and their significant growth. It is recommended to use small single compressions, implement intermediate preheating of the deformable workpiece, etc. To avoid quenching cracks, it is proposed to quench steel with cooling in oil with an increased heating temperature - 1040-1050 degrees of Celsius or use air cooling (when proper hardenability is achieved).