Abstract
We perform the quantitative fractal analysis of the grain boundaries in the microstructure of Ds steel of five oxygen cylinders with a period of operation from 18 to 52 years. Their fractal dimension is determined by the superposition of square cells of different sizes on the image of the selected grain boundary with computing the number of points of their intersection with this boundary (box method). We establish correlations between the fractal dimension of grain boundaries and the impact toughness, fracture pressure, and yield strength. The corresponding regression equations are deduced. We also analyze the fracture mechanisms connected with the fractal dimension of the grain boundaries.
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