PSI - Issue 36

V. Kharchenko et al. / Procedia Structural Integrity 36 (2022) 277–283 A.V. Sereda et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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4. Conclusions The author presented the instrumented indentation test method for the assessment of strength of high-strength sheet steels as one of the efficient non-destructive control methods. The comparison investigations on the strength and yield limits of sheet high-strength steels such as 28GKhNMR, 20GR (10 mm thickness), 30Kh2SN2MFA, 28GRA (6 mm thickness) as delivered, along and across the rolling using the instrumented indentation test method, Brinell hardness and uniaxial tension were performed. These steels were used for the production of special-purpose structures to verify the method’s performance. To assess the accuracy of the determination of the strength characteristics via instrumented indentation test method, the procedure for the express methods for the strength determination of steels via the Brinell hardness was applied. Consequently, the deviations in the obtained values R p0.2 and R m for the steels as compared with those obtained in uniaxial tension did not exceed 10.4 %. It was established that the most accurate method of the determination of strength and yield limit is the method of instrumented indentation. It is shown that the deviations in the strength limits obtained via instrumented indentation test method do not exceed 5.2 % as compared to those determined in tension. References Bolzon, G., Rivolta, B., Nykyforchyn, H., Zvirko, O., 2018. Mechanical analysis at different scales of gas pipelines. Engineering Failure Analysis 90, 434 – 439. Chukin, M.V., Poletskov, P.P., Guschina, M.S., Berezhnaya, G.A., 2016. Determination of the mechanical properties of high-strength and super strength steels by hardness. Processing of solid and laminated materials 1(44), 28 – 34. DSTU ISO 6892-1:2019 Metallic Materials. Tensile Tests. Part 1. Room Temperature Testing (ISO 6892-1:2016, IDT) DSTU EN ISO 6506-1:2019 Metallic Materials. Brinell hardness Testing. Part 1. Test Method (EN ISO 6506-1:2014, IDT; ISO 6506-1:2014, IDT). – Valid since 01.11.2019. Haggag, F. M., 2007. Innovative SSM Technology Determines Structural Integrity of Metallic Structures: Example Applications for Pressure Vessels and Oil and Gas Pipelines. International Journal of Pure and Applied Physics 1, 91 – 108. ISO 14577-1:2015. Metallic materials – Instrumented indentation test for hardness and materials parameters – Part 1: Test method. – Valid since 2015 – 07 – 15. Katok, O.A., Rudnitskyi, M.P., Shvets, V.P., Kharchenko, V.V., Bazhukov, A.V., Melnyk, P.E., 2014. On the Determination of Steel Mechanical Characteristics from Hardness Test Results. Stren. Mater. 6 (432), 66 – 70. Katok, O.A., Kravchuk, R.V., Kharchenko, V.V., Rudnitskyi, M.P, 2019. A setup for complex investigation of the mechanical characteristics of NPP equipment structural materials. Streng. Mater. 2, 171 – 181. Kharchenko, V.V., Katok, O.A., Drozdov, O.V., Rudnitskyi, M.P, 2009. A mobile device for the determination of strength characteristics of metal via instrumented indentation. Reliability and Lifetime of Machines and Structures 32, 162 – 168. Matuynin, V.M., Marchenkov, A. Yu., 2016. Interrelation of strains and metal strengthening parameters in tension and indentation in the plastic region. Zavod. Lab., Materials Diagnostics 51-57. Oliver, W. C., Pharr, G. M., 1992. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. J. Mater. Res. 7, 1564 – 1583. SOU-N NAEK 133:2016. Engineering, Scientific and Technical Support. Technique of Determination of Mechanical Properties of Metal from Hardness Test Results [in Ukrainian], Energoatom, Kyiv. SОU -56-28-2018. Metallic materials. Determination of the mechanical properties of structural materials according to Brinell hardness and instrumental indentation. Test method. – G.S. Pisarenko Institute for Problems of Strength of the NAS of Ukraine. – Kyiv – 2018. – Valid since 2019 – 01 – 01. 1.2.1.02.019.1121-2016. Determination of Mechanical Properties of Metal Equipment at NPPs using Specimen-Free Methods by Hardness Characteristics. Instruction.