锅炉受热管蒸汽侧氧化膜拉伸失效实验研究

racking and exfoliation of steam-side oxide scale on high-temperature boiler tubes can affect the safety and economy of thermal power units. In this work, tension tests using acoustic emission (AE) monitoring technique were implemented to study the failure process of steam-side oxide scale on boiler tubes. Frequency spectra of AE signals were obtained by performing fast Fourier transform. In the frequency spectra, three different peak frequency bands were identified, which were inferred to respectively correspond to plastic deformation of substrate, oxide cracking, and oxide exfoliation with the aid of SEM observations, and can thus be used for determining various oxide failure modes. Finally, the critical cracking strain of oxide scale was also estimated with the experimental data.