Features of heat treatment of welded joints of railway rails
Main Article Content
Abstract
The purpose of the work is to create inductors for heat treatment of welded joints of railway rails using induction heating with currents at a frequency of 2.4 kHz and to study the effect of heat treatment on the structure and hardness of the metal of welded joints made by contact butt and automatic submerged arc welding with a consumable nozzle. The inductors' inductive wires follow the shape of the rail profile and contain magnetic circuits installed above the rolling surface and the side faces of the head, neck and sole base. It has been established that the inductors provide a uniform distribution of the temperature field in the rail profile elements and a low temperature difference between the surface and deep metal layers. During heat treatment of welded joints of railway rails of type P65 made of steel K76F, made by contact butt-welding, the time for heating the joints to a temperature of 890 °C is 160 s. It is shown that after heat treatment of welded joints, the metal grain is crushed across the entire width of the heat-affected zone. The hardness of the metal approaches the hardness of the base metal in all rail elements. During heat treatment of welded joints made by automatic submerged arc welding with a fusible tip, the heating time to a temperature of 890 °C is 180 s. It has been established that under conditions of forced cooling of the head rolling surface with an air-water mixture, the uneven distribution of the width of the thermally affected zone in the rail profile elements decreases, the grain in the metal structure of the colossal zone and the zone of incomplete recrystallization is crushed, and the hardness of the metal of the colossal zone approaches the level of hardness of the base rail metal.
Article Details
Issue
Section
This work is licensed under a Creative Commons Attribution 4.0 International License.
References
1. Kuchuk-Yatsenko, S.I., Antipin, E.V., Didkovskyi, O.V. et al. (2020) Evaluation of quality of welded joints of high-strength railway rails of modern production taking into account the requirements of ukrainian and european standards. The Paton Welding J., 7, 3–11. DOI: https://doi.org/10.37434/tpwj2020.07.01
2. Кuchuk-Yatsenko S. I., Didkovsky A. V., Shvets V. I. et al. (2016) Flash-butt welding of high-strength rails of nowadays production, The Paton Welding J., 5-6, 7-16. https://doi.org/10.15407/tpwj2016.06.01
3. Gong, L., Zhu, L., Zhou, H. X. (2017) Effect on hardness and microstructures of rail joint with uitra-narrow gap arc welding by post weld heat treatment. Engineering Materials, 737, 90-94.
4. Kuchuk-Yatsenko S. I., Krivenko V. G., Didkovsky A. V. (2012) Technology and new generation of equipment for flash-butt welding of high strength rails of advanced production in construction and reconstruction of high-speed rail road lines. The Paton Welding J., 2, 3-8.
5. Chao, Yu, Hong, Xiao, Zi-Сhen, Qi, Yun-peng, Zhao (2019) Finite element analysis and experiment on induction heating process of slab continuous casting-direct rolling. Metallurgical Research & Technology, 116 (4), 403. Doi: https://doi.org/10.1051/metal/2018117
6. Li, F., Ning, J., Liang, S. (2019) Analytical Modeling of the Temperature Using Uniform Moving Heat Source in Planar Induction Heating Process. Applied Sciences, 9, 14–45. Doi: https://doi.org/10.3390/app9071445
7. Gong L., Zhu L., Zhou H. X. (2017) Effect on hardness and microstructures of rail joint with ultra-narrow gap arc welding by post weld heat treatment. Engineering Materials, 737, 90–94.
8. Genkin I.Z. (2003) Heat treatment of welded joints in rail using induction units. The Paton Welding J., 9, 38-41.
9. Panteleymonov Е.А. (2018) To the issue of heat treatment of welded butts of rails. The Paton Welding J., 3, 36-40. https://doi.org/10.15407/tpwj2018.03.08
10. Prokofiev O.S., Gubatyuk R.S., O.S. Pismennyi O.S. et al. (2020) Development of inductors for bulk and surface heat treatment of welded butt joints of railway rails. The Paton Welding J., 5, 41-48. https://doi.org/10.37434/tpwj2020.05.07
11. Panteleimonov E.O. (2021) Portable module for heat treatment of welded joints of railway rails. The Paton Welding J., 4, 43-47. https://doi.org/10.37434/tpwj2021.04.07
12. Panteleimonov E.O. (2022) Inductors for heat treatment of welded butt joints of railway and tram grooved rails. The Paton Welding J., 3, 41-44. https://doi.org/10.37434/tpwj2022.03.06
13. Kuzmenko G. V., Kuzmenko V. G., Galinich V. I. et al. (2012) New technology of electric arc welding of rails using a bath method under conditions of tram and crane tracks. The Paton Welding J., 5, 33-37.
14. Bajic D., Kuzmenko G., Samardzic I. (2013) Welding of rails with new technology of arc. Welding metallurgical, 52, 3, 399-402
15. Pantelejmonov E. A., Gubatuk R. S. (2016) Induction device for heat treatment to frail way rails welded butts. The Paton Welding J., 10, 41-44. https://doi.org/10.15407/tpwj2016.10.08
16. Kuchuk-Yatsenko S.I., Antipin E.V., Didkovsky O.V. (2020) Evaluation of quality of welded joints of high-strength railway rails of modern production taking into account the requirements of Ukrainian and European standards. The Paton Welding J., 7, 3-11. https://doi.org/10.37434/tpwj2020.07.01