Manufacturing Technology 2025, 25(1):86-94 | DOI: 10.21062/mft.2025.003
Microscopic analysis of selected materials used for hot water heating using SEM
- Faculty of Industrial Technologies, Alexander Dubček University of Trenčín. Ivana Krasku 491/30, 020 01, Púchov. Slovak Republic
The introduced work deals with the microscopic analysis of metallographically prepared selected metal materials structures, using a scanning electron microscope (SEM). Prepared samples of seamless steel pipes were subjected to a thorough microscopic examination from the outer surface to the inner regions in order to interpret the spe-cific structure, including the change of the inner surfaces due to wear. The experiment showed that the micro-structure and character of the surfaces play a crucial role in the behavior of metallic materials under real condi-tions. Four types of pipes were monitored according to their use. The unused steel pipe (designated as sample No. 1) exhibited a rough outer surface with identified inclusions, while the used pipe (designated as sample No. 2) showed marks of intergranular corrosion and significant wear after long-term use. The older pipe (designated as sample No. 3) showed a decarburized area and inclusions containing sulfides and aluminum. The steel pipe with corrosion layers (designated as sample No. 4) exhibited a continuous corrosion layer with cavitation and cracks. The results of this study offer a comprehensive view relating to the influence of the nature of the micro-structure and wear on the water flow (performance) of metal pipes, with an emphasis on the identification of possible risks associated with geometry change, corrosion and wear. The recommendations create a basis for predicting the degradation as well as appropriate maintenance to ensure their long and reliable service life under real-world conditions of use.
Keywords: Analysis, Microscopic, Structure, Material wear, Pipes
Grants and funding:
This work was supported by the Slovak Grant Agency – project KEGA 011TnUAD-4/2024.This work was supported by the Slovak Grant Agency – project KEGA 011TnUAD-4/2024
Received: June 26, 2024; Revised: January 22, 2025; Accepted: January 24, 2025; Prepublished online: February 20, 2025; Published: April 25, 2025 Show citation
References
- MORAVČÍK, R., HAZLINGER, M.: Science of materials II. STU Bratislava, 2009, 1st ed., 243 pages, ISBN 978-80-8096-081-0.
- PALČEK, P., HADZIMA, B., CHALUPOVÁ, M.: Material characteristics. University of Žilina, Žilina, 2004.
- NOVÁK, P. Basic principles of corrosion of metals in electrolytes, In: Corrosion in energy. 2006, Košice. s.1.
- Lipiński T. Influence of Impurity Morphology on the Fatigue Strength of High-Purity Structural Steel Melted in an Electric Furnace. Manufacturing Technology. 2023;23(1):53-59. doi: 10.21062/mft.2023.001.
Go to original source...
- MARČEK, Ľ. Comparison of the use of materials in hot water conduction of media for heating elements. Trenčín: FPT KMI Púchov, 2020. Diploma thesis.
- Augustín G, Ingrid G. Stability analysis of roundness profiles of drawn tubes. Manufacturing Technology. 2020;20(3):307-312. doi: 10.21062/mft.2020.051.
Go to original source...
- STN EN 14 868 Protection of metallic materials against corrosion. Assessment instructions the probability of corrosion in closed systems with water recirculation.
- Svobodova J, Benes L, Brabec J. Changes in Steam Pipeline Properties after Long-term Exposure. Manufacturing Technology. 2020;20(4):534-537. doi: 10.21062/mft.2020.104.
Go to original source...
- Náprstková N, Šramhauser K, Hren I, Novotný J, Sviantek J. Microscopic Wear Analysis of Indexable Inserts after Machining of 34CrNiMo6 Steel. Manufacturing Technology. 2023; 23 (5): 676-684. doi: 10.21062/mft.2023.077.
Go to original source...
- KREIBICH, V. Theory and technology of surface treatments, Prague: Czech Technical University in Prague, 1996.
- BARTONÍČEK, R. Corrosion and corrosion protection of metals. Prague: Academia, 1966.
- HADZIMA, B. LIPTÁKOVÁ, T.: Fundamentals of electrochemical corrosion of metals. 1st edition, Žilina: Edis, 2008. 112 p. ISBN 978-80-8070-876-4.
- Directive for heating water VDI 2035 - 1 Properties of heat transfer fluids.
- ANISIMOV, E., PEŠLOVA, F., HAJDUCHOVÁ, Ľ. Corrosion attack of pipes for heating medium distribution. Chem. Letters 105, p 616-p 617, 2011.
- KARLÍK, M.: Introduction to transmission electron microscopy. Ed. 1. Prague: Czech Technical University in Prague, 2011. 321 pp. ISBN 978-800-1047-293.
This is an open access article distributed under the terms of the Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0), which permits non-comercial use, distribution, and reproduction in any medium, provided the original publication is properly cited. No use, distribution or reproduction is permitted which does not comply with these terms.