Abstract
We propose a theoretical and experimental method for the investigation of high-temperature hydrogen-assisted fracture of bimetallic structural elements operating in hydrogen-containing media. It is shown that fracture occurs as a result of the coalescence of pores followed by the formation of a crack and its subsequent growth promoted by the high pressure of the gas accumulated in the crack. The time dependences of the processes of nucleation of the crack and growth of its area on the boundary of fusion of 15Kh2MFA-A steel with austenitic coating are plotted according to the data of theoretical investigations. The correctness of the theoretical foundations of the proposed method is corroborated experimentally. For this purpose, we use the method of acoustic emission, ultrasonic sounding, and metallographic analysis.
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