Abstract
The kinetics of corrosion-fatigue crack growth in the angle steel of the boom frame of a clamp-forming machine after its operation for 30 yr is studied for a high load ratio in a model medium simulating rainfalls in the industrial regions. For the material in the intact state, we do not reveal the influence of corrosive media on the crack growth rate. At the same time, this influence strongly accelerates the fracture processes in the material after operation, especially within the Paris segment of the kinetic fracture diagrams. In their near-threshold segments, the retardation of crack growth is possible, which is probably connected with the corrosion blunting of its tip. It is shown that the specific fatigue striation in the area of near-threshold crack growth may serve as a fractographic sign of the in-service degradation of the metal of the analyzed structure.
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