PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 59 (2024) 253–258

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract The article is devoted to experimental studies of the kinetics of damage accumulation in different directions of deformation development. The metal homogeneity of solid cylindrical specimens made of heat-resistant steels 10HN2MFA, 15X2MFA and 15X2NMFA was evaluated using the LM-hardness method. Experimental studies in the area of the development of the necking in the specimen cross-section in different directions of accumulation of deformations of different signs (along the axis of the specimen ε z based on the measurement of longitudinal deformation and in the circumferential direction ε θ by the smallest diameter) were carried out under conditions of uniaxial stepped tension. The analysis of the obtained data showed that the loosening of the material and the nucleation of discontinuities in it, in particular under mechanical influences, create differences in the homogeneity of the material that arises in the process of plastic deformation. The results of studies of the microstructure of the metal in the longitudinal and cross-section of the specimen's neck before fracture indicate a higher level of homogeneity of the metal in the cross-section of the specimen, that is, less loosening of the metal compared to damage in the longitudinal direction at a certain critical value of longitudinal deformation. The obtained results make it possible to evaluate the relationship between the damage kinetics of heat-resistant steels in two mutually perpendicular directions during the development of multidirectional deformations at the same stress level under conditions of uniaxial tension. © 2024 The Autho rs. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Experimental validation of the assessment of the limit state of heat-resistant steels by the LM-hardness method Pavlo Bulakh* Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Ukraine, 2 Sadovo-Botanichna str., Kyiv-014, 01014, Ukraine

* Corresponding author. Tel.: +3-8-067-987-5235. E-mail address: pavelbulakh@gmail.com

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.036