Abstract
The majority of production processes in the production of parts of gas and oil field equipment include surface-strengthening operations providing the creation of the optimum surface-layer condition. The place of such an operation in the production process of a part must be determined taking into consideration technological heredity, i.e., in such a manner that the effect obtained as a result of strengthening does not disappear in subsequent operations. This article considers the phenomenon of inheritance of strength properties of a metal as a result of treatment of the blanks by the method of explosive strengthening. ERe samples, cylindrical blanks of 40Kh and 60S2KhA steels after rough machining, were subjected to loading by explosion with glancing detonation by an explosive substance. Then the strengthened samples together with similar samples in the original condition were heat treated using the cycles recommended for treatment of steels of the corresponding types. The degree of strengthening of the surface layer of the metal was determined from the change in physicomechanical properties, including the microhardness H and the dislocation density p. The microhardness was measured on a PMT-3 tester and the dislocation density on the surface of the samples was determined by the known method [i]. The following results were obtained:
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