Abstract
The number of cycles to failure for 08X18H10T, 20X23H18, 2X13, and Э76Ф steel and Silumin (Al–12% Si alloy) may be increased by a factor of 3.5 by electron-beam treatment with the following parameters: energy density of the electron beam 10–40 J/cm2; pulse length 50–150 µs; 3–5 pulses; and pulse frequency 0.3 s–1. By scanning and transmission electron-diffraction microscopy, the structure and phase states and defect substructure of these materials may be investigated. The increase in the fatigue life of the steel is due to the transformation of the surface structure of the material under the action of the intense pulsed electron beam. In physical terms, the influence of the multilevel structure and phase state on the mechanical properties of the surface layer indicates redistribution of the elastic energy both on account of the interaction of the elastic fields of structural elements at different scale levels and on account of the reduction of the scale level corresponding to localization of the plastic deformation.
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