Abstract
The structure and micromechanism of crack growth in steel 09G2S are studied after heat and thermal deformation treatments involving cold radial forging (CRF) with 55% total deformation and subsequent annealing at 300 and 600°C. A method for electron microscope panoramic X – Y – Z joining of images of a fracture surface with level difference up to 3 mm is developed and tested. The structure under a fracture surface of steel 09G2S after CRF and annealing at 300°C is studied. The positive role of bands of adiabatic shear forming in the structure under cold radial forging in dispersion of the steel is demonstrated. Special features of the micromechanism of crack growth due to formation of splits are determined.
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