EFFECT OF EQUALITY OF TIME INTERVALS FROM SUSTAINABLE LOCALIZATION OF DEFORMATION TO FRACTURE OF SAMPLES FROM STRUCTURAL AND HEAT-RESISTANT STEEL

The problem of assessing the residual life of long-running technical devices of hazardous production facilities is relevant for technical diagnostics and industrial safety examination. Currently, complex approaches are used for these purposes, including cumbersome calculation algorithms, analysis of the results of non-destructive and destructive tests, as well as metallography. Thus, resource assessment is a labor-intensive process that does not always provide the necessary accuracy of the results obtained due to the summation of various types of errors (calculations, equipment, human factor). The obtained values of mechanical characteristics cannot be fully ap-plied to equipment that is operated for a long time at elevated temperatures, since they were determined at room temperature and at relatively high strain rates and, thus, are short-term. Therefore, dependencies were ob-tainedthat are a transition from short-term mechanical characteristics determined at room temperature to long-term mechanical characteristics, which are characteristics of heat resistance and more accurately describe the behavior of the metal during long-term operation under conditions of high temperatures and pressures. The work revealed the features of the formation of zones of stable localization of deformations for structural and heat-resistant steels with different long-term strength during short-term tests. The established effect of differ-ences in time intervals from the onset of deformation to stable localization of deformation and the effect of equality of time intervals from stable localization of deformation to failure of samples with different long-term strength. On the one hand, the difference effect can be used to assess the long-term strength of a metal, on the other hand, the equality effect can be used to assess the residual life of long-term power equipment.

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