Abstract
We investigate the influence of the mode of thermal treatment, the structure and properties of a material, the direction of propagation of cracks, temperature, and the parameters of a loading cycle and a corrosion-active medium on the cyclic crack resistance of chromium–nickel austenitic stainless steels of a Du-500 pipeline, the main gate valve G33 Du-500, and the header of a PGV-1000U steam generator. We show that water with high parameters, the stress ratio, and the temperature have the strongest effect on the growth rate of cracks. By using metallographic and electron-fractographic methods, we revealed specific features of fatigue fracture of steels in air and water with high parameters. On the basis on these data and a generalization of the well-known results, we propose the rated dependences for the determination of the growth rate of fatigue cracks. These dependences are compared with the rated curves of the M-02-91 normative documentation and the ASME Code and recommended for their correction.
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