PSI - Issue 33

M.R. Tyutin et al. / Procedia Structural Integrity 33 (2021) 765–772 M.R. Tyutin , L.R. Botvina, A.V. Ioffe/ Structural Integrity Procedia 00 (2019) 000–000

772

8

Conclusions • It was found that operation does not lead to a degradation in the standard mechanical properties of the steels under study. Only a decrease in the fatigue life of stainless steel after operation can be noted. • Four stages of acoustic emission changes at specimen fracture were distinguished. It is established that acoustic emission is the most sensitive to structural degradation due to operation and hydrogen charging. • The greatest influence on the mechanical properties has exposure in hydrogen sulfide NACE environment, after which a decrease in ductility, fracture work, fatigue life of bainitic steel 15Cr2MnMoV specimens were observed. • Magnetic methods of nondestructive testing show the maximum sensitivity at the elastic stage and at the stage of localization of deformation before the final failure of 15Cr2MnMoV steel specimens. Acknowledgements The study was supported by the Russian Science Foundatio n (project №19 -19-00674). References Botvina, L.R., Petersen, T.B., Soldatenkov, A.P., Tyutin, M.R., 2015. Time dependences of acoustic signal characteristics during fracture of metal samples. Dokl. Earth Sci. 462, 475–478. https://doi.org/10.1134/S1028334X15050037 Botvina, L.R., Tyutin, M.R., 2019. New acoustic parameter characterizing loading history effects. Eng. Fract. Mech. 210, 358–366. https://doi.org/10.1016/j.engfracmech.2018.06.020 Botvina, L R, Tyutin, M.R., Bolotnikov, A.I., Petersen, T.B., 2021. Effect of Preliminary Cycling on the Acoustic Emission Characteristics of Structural 15Kh2GMF Steel. Russ. Metall. 2021, 32–41. https://doi.org/10.1134/S0036029521010043 Botvina, L. R., Tyutin, M.R., Levin, V.P., Ioffe, A. V., Perminova, Y.S., Prosvirnin, D. V., 2021. Mechanical and Physical Properties, Fracture Mechanisms, and Residual Strength of 15Kh2GMF Steel for Oil Sucker Rods. Russ. Metall. 2021, 546–558. https://doi.org/10.1134/S0036029521040066 Botvina, L.R., Tyutin, M.R., Sinev, I.O., Bolotnikov, A.I., 2020. The effect of preliminary cyclic loading on acoustic emission parameters and damage of structural steels. Procedia Struct. Integr. 28, 2118–2125. https://doi.org/10.1016/j.prostr.2020.11.038 Calabrese, L., Galeano, M., Proverbio, E., Di Pietro, D., Donato, A., 2020. Topological neural network of combined AE and EN signals for assessment of SCC damage. Nondestruct. Test. Eval. 35, 98–119. https://doi.org/10.1080/10589759.2019.1652294 Krechkovska, H., Student, O., Lesiuk, G., Correia, J., 2018. Features of the microstructural and mechanical degradation of long term operated mild steel. Int. J. Struct. Integr. 9, 296–306. https://doi.org/10.1108/IJSI-10-2017-0056 Nazarchuk, Z., Skalskyi, V., Serhiyenko, O., 2017. Acoustic emission: Methodology and Application, Foundations of Engineering Mechanics. Nykyforchyn, H., Lunarska, E., Tsyrulnyk, O.T., Nikiforov, K., Genarro, M.E., Gabetta, G., 2010. Environmentally assisted “in-bulk” steel degradation of long term service gas trunkline. Eng. Fail. Anal. 17, 624–632. https://doi.org/10.1016/j.engfailanal.2009.04.007 Ono, K., 2008. Structural integrity evaluation by means of acoustic emission. Acoust. Emiss. Crit. Phenom. 13–27. https://doi.org/10.1201/9780203892220.pt1 Pluvinage, G., 2021. Mechanical properties of a wide range of pipe steels under influence of pure hydrogen or hydrogen blended with natural gas. Int. J. Press. Vessel. Pip. 190, 104293. https://doi.org/10.1016/j.ijpvp.2020.104293 Qin, G., Xu, S., Yao, D., Zhang, Z., 2016. Study on the degradation of mechanical properties of corroded steel plates based on surface topography. J. Constr. Steel Res. 125, 205–217. https://doi.org/10.1016/j.jcsr.2016.06.018 Tyutin, M.R., Botvina, L.R., Petersen, T.B., 2020. Tensile damage evolution of structural steels with different structure. Procedia Struct. Integr. 28, 2148–2156. https://doi.org/10.1016/j.prostr.2020.11.042 Zvirko, O., Tsyrulnyk, O., 2021. Non-destructive Electrochemical Evaluation of Pipeline Degradation. pp. 31–44. https://doi.org/10.1007/978-3 030-58073-5_3 Bashkov, O.V. 2011. "Analysis of the Defect Structure Evolution of Polycrystalline Materials at Various Stages of Loading by the Acoustic Emission Method.". Komsomolsk-on-Amur State Technical University. Doctoral dissertation (In Russian): 365.