DEVELOPMENT OF A MODEL FOR CALCULATING CHANGES IN K76F RAIL STEEL TEMPERATURE TO DETERMINE THE HEAT TREATMENT PARAMETERS

Authors

DOI:

https://doi.org/10.15407/scine17.04.025

Keywords:

railway rail, hardness, calcination, mathematical model, cooling rate

Abstract

Introduction. The conditions of operation of the railways of Ukraine and the prospects for their entry into the international system of transport corridors require the development and modernization of railway tracks, including rails.
Problem Statement. Given the necessity to ensure the main operational parameter of the rails (wear resistance), regulatory and technical documents standardize hardness. The most progressive European standard EN 13674-1-2011 establishes that the hardness of the rail head at a depth of 20 mm shall be, at least, 321 HB, while
DSTU 4344:2004 requires, at least, 321 HB at a depth of 11 mm. At the same time, according to EN 13674-12011, the rail surface hardness without the formation of needle structures shall be, at least, 405 HB.
Purpose. To determine the possibility of achieving hardness without needle structures for rail head made of steel 0,80% C, 0,25% Si, 0,97% Mn, 0,055% V (hereinafter referred to as K76F), which complies with the world requirements, based on the calcination experiment and calculations with the use of the model; to determine the rational cooling rate for K76F steel during heat treatment.
Materials and Мethods. K76F rail steel with 0.80% C, 0.25% Si, 0.97% Mn, 0.055% V. Techniques: metallographic studies, hardness measurements, determination of calcination by end quenching, modeling by means of
mathematical calculation with the use of QForm heat treatment software package.
Results. The change in temperature, the formation of structure and hardness across the section of a K76F steel sample for calcination tests according to GOST5657 has been modeled. The changes in the hardness and microstructure has been experimentally established, depending on the distance to the heat sink surface; the cooling rate in the points where the hardness meets the requirements of EN 13674-1-2011 for rails has been determined.

Conclusions. The analysis of the model has shown a high accuracy of the model and the convergence of the experimental results with the calculated ones. It has been established that the requirements of EN 13674-1-2011 can be achieved up to a hardness of 405 HB without the formation of needle structures on steel that meets the
chemical composition of K76F according to DSTU 4344: 2004.

Author Biographies

Oleksandr Babachenko, Iron and Steel Institute of Z. I. Nekrasov of the National Academy of Sciences of Ukraine

Oleksandr Babachenko

Director ISI NASU

Doct.tech.scien., senior researcher 

0503628289

a_babachenko@i.ua

Iron and Steel Institute of Z. I. Nekrasov of the National Academy of Sciences of Ukraine, Ak. Starodubova K. F. sq., 1, 49107, Dnipro, Ukraine

ORCID: 0000-0002-2869-3478

Ganna Kononenko, Iron and Steel Institute of Z. I. Nekrasov of the National Academy of Sciences of Ukraine

Kononenko Ganna

Scientific Secretary of ISI NASU

Doct. Phd, senior researcher

0504519047

perlit@ua.fm

Iron and Steel Institute of Z. I. Nekrasov of the National Academy of Sciences of Ukraine, Ak. Starodubova K. F. sq., 1, 49107, Dnipro, Ukraine

ORCID: 0000-0001-7446-4105

Rostyslav Podolskyi, Iron and Steel Institute of Z. I. Nekrasov of the National Academy of Sciences of Ukraine, National Metallurgical Academy of Ukraine

Podolskyi Rostyslav

0958480774

rostislavpodolskij@gmail.com

Iron and Steel Institute named after Z. I. Nekrasov of the National Academy of Sciences of Ukraine, Ak. Starodubova K. F. sq., 1, 49107, Dnipro, Ukraine,National Metallurgical Academy of Ukraine, Gagarin Ave.,4, 49000, Dnipro, Ukraine

ORCID ID: 0000-0002-0288-0641

References

Podolskyi, R. V., Deineko, L. N. (2019, May). Determination of ways to increase the operational stability of the railway track. Proceedings of the All-Ukrainian Scientific and Technical Conference of Students and Young Scientists “Young Academy 2019” (May 18, 2019, Dnipro), 82. Dnipro [in Russian].

Podolskyi, R. V., Safronova, O. A., Babachenko, O. I., Kononenko, G. A. (2020, March). Investigation of the influence of heat treatment on the formation of the microstructure and hardness of experimental rail steels. Proceedings of the XI All-Ukrainian Conference of Young Scientists “Young Scientists — 2020” (March 16, 2020, Dnipro), 53—56. Dnipro [in Ukrainian].

Podolskyі, R. V., Deineko, L. M. (2020, May). Determination of further areas to increase the operational reliability of the new generation of railway tracks. Proceedings of the All-Ukrainian Scientific and Technical Conference of Students and Young Scientists “Young Academy 2020” (May 12, 2020, Dnipro), 59. Dnipro [in Ukrainian].

Babachenko, O. I., Kononenko, G. A., Filonenko, N. Yu., Khulin, A. Yu. (2018). Development of a mathematical model for calculating the thermal field at the cross section of the railway rail during heat treatment. Construction, materials science, mechanical engineering, 100, 31—35 [in Ukrainian].

DSTU 4344: 2004. Rails are common for wide gauge railways. General technical conditions. Kyiv, 2005. 31 p. [in Ukrainian].

GOST R 51685-2013. Railway rails. General technical conditions (EN 13674-1: 2011, NEQ). Moscow, 2014. 96 p. [in

Russian].

EN 13674-1: 2011 (E). Railway applications — Track — Rail — Part 1: Vignole railway rails 46 kg / m and above. Brussels, 2011. 108 p.

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Published

2021-08-09

How to Cite

Babachenko О. ., Kononenko Г., & Podolskyi Р. (2021). DEVELOPMENT OF A MODEL FOR CALCULATING CHANGES IN K76F RAIL STEEL TEMPERATURE TO DETERMINE THE HEAT TREATMENT PARAMETERS . Science and Innovation, 17(4), 25–32. https://doi.org/10.15407/scine17.04.025

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Section

Scientific and Technical Innovation Projects of the National Academy of Sciences