Physical simulation of structural transformations in the welded joint of high-carbon rail steel
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Abstract
Abstract This article presents the results of physical modelling of the heat treatment process and investigates the effect of its parameters on the welded joint metal of K76F rail steel. Dilatometric tests were performed to determine the critical temperatures of the structural and phase transformations at different cooling rates. The temperature and time intervals of the transformations were determined and a CCT diagram of the austenite transformations was constructed. It was found that the polymorphic α→γ transformation for the weld metal begins at a temperature of 739 °C (Ac1) and ends at a temperature of ∼790 °C (Ac3). The onset of structural transformations occurs in the temperature range of 600–650 °C and decreases with an increase in the cooling rate. The effect of the cooling rate on the mechanical properties and the influence of the cooling characteristics on the structural and phase composition of the welded joint metal were investigated. During the heat treatment of the welded joint, ferrite-pearlite and pearlite-martensite structures are formed. With an increase in the cooling rate above 16 °C s−1, the amount and size of the martensitic component in the weld metal increased. It was found that the optimum cooling rates that meet the requirements of standards for the distribution of hardness and microstructure are in the range of 8–12 °C s−1. The obtained results can be used to improve existing and developed new modes of heat treatment of welded joints and to improve the accuracy of predicting the phase composition of the weld metal of high-carbon rail steels.
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Research context
OpenAlex topics: Metal Alloys Wear and Properties · Material Properties and Failure Mechanisms · Railway Systems and Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
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1. Flash-butt welding of high-strength rails of nowadays production10.15407/tpwj2016.06.01 ↗
2. Progress and prospects of rail for railroads
3. Advanced rail steels for heavy haul application-track performance and weldability
4. Relationship between Rockwell hardness and pearlite lamellar spacing of hardened layer under different cooling rates for U75 V 60 kgm−1 heavy rail10.1002/mawe.201900198 ↗
5. Microstructure and properties evaluation of rail-steel after isothermic heat treatment
6. Heat treatment of welded joints of high-strength railway rails (Review)10.15407/tpwj2019.02.07 ↗
7. Operational control as a means of the evaluation of quality of welded connections for flash-butt welding of modern high-strength steels10.15407/scine16.02.066 ↗
8. The role of welding parameters on the control of the microstructure and mechanical properties of rails welded using FBW10.1016/j.jmrt.2020.05.030 ↗
9. Rail weld defect prediction and related condition-based maintenance10.1109/ACCESS.2020.2999385 ↗
10. Critical analysis of RCF rail defects classification10.1016/j.trpro.2022.06.294 ↗
11. Fracture analysis of U71Mn rail flash-butt welding joint10.1016/j.csefa.2015.05.001 ↗
12. Microstructural characterisation of rolling contact fatigue damage in flash-butt welds10.1016/j.wear.2016.03.020 ↗
13. Track dynamic behavior at rail welds at high speed10.1007/s10409-009-0332-9 ↗
14. Influence of welding on microstructure and strength of rail steel10.1016/j.conbuildmat.2020.118220 ↗
15. Microstructure-based approach to the evaluation of welded joints of bainitic rails designed for high-speed railways10.1016/j.jcsr.2020.106372 ↗
16. Microstructure and mechanical properties of a flash-butt welded pearlitic rail10.1016/j.jmatprotec.2019.02.013 ↗
17. Analysis of damaged rail weld10.2219/rtriqr.44.59 ↗
18. Fatigue prediction of rail welded joints10.1016/j.ijfatigue.2018.03.038 ↗
19. Investigation of rail damage considering impact at a welded joint under wet condition10.1108/ILT-09-2023-0309 ↗
20. Effects of rail flash-butt welding and post-weld heat treatment processes meeting different national standards on residual stresses of welded joints10.3139/146.111935 ↗
21. Failure analysis of recurrent cases of fatigue fracture in flash butt welded rails10.1016/j.engfailanal.2015.05.022 ↗
22. Microstructure and residual stress variations in weld zone of flash-butt welded railroads10.1179/136217104225012201 ↗
23. Evaluation of the effect of heat input and cooling rate of rail flash-butt welding using finite element method simulation10.1590/0104-9224/si27.01 ↗
24. Experimental and numerical investigations: alleviating tensile residual stresses in flash-butt welds by localized rapid post-weld heat treatment10.1016/j.jmatprotec.2007.05.055 ↗
25. Railways—Infrastructure—Flash Welding of New Rails · 2019
26. Railway applications · 2015
27. New welded rails for railways · 2021
28. Effect of pearlitic and bainitic initial microstructure on cementite spheroidization in rail steels10.1016/j.jmrt.2023.01.087 ↗
29. Preparation and wear properties of high-silicon high-vanadium wear-resistant alloy with nano-pearlite matrix and carbides composite structure10.1016/j.jmrt.2023.11.279 ↗
30. Improving the mechanical properties and wear resistance of a commercial pearlitic rail steel using a two-step heat treatment10.1007/s11661-021-06432-0 ↗
31. Influence of laser strengthening techniques on anti-wear and anti-fatigue properties of rail welding joints10.1016/j.engfailanal.2019.03.012 ↗
32. The simulation of the process of heat treatment of welded joints of high-strength railway rails10.1063/5.0071364 ↗
33. Premium rail flash-butt welding process window based on phase transformations10.4028/p-OPueO9 ↗
34. Effect of preheating temperature on the mechanical and fracture properties of welded pearlitic rail steels10.4236/eng.2013.511101 ↗
35. Justification of the choice of thermo-kinetic parameters of the cooled K76F steel to increase hardness across the rail head section10.30838/J.PMHTM.2413.241120.30.688 ↗
36. Improvements in welding continuous cooling transformation diagram of high-strength low-alloy steel weld10.1080/02670836.2023.2215644 ↗
37. Prediction of continuous cooling transformation diagram for weld heat affected zone by machine learning10.1080/27660400.2022.2123262 ↗
38. Predictive mathematical modeling of the flash-butt welding process to optimize the properties of welds of premium and super premium rails
39. Effect of normalisation on the microstructure and wear resistance of U75V rail welded joints in desert service environments10.1016/j.jmrt.2025.01.128 ↗
40. Characterization and prediction of continuous cooling transformations in rail steels10.1590/1980-5373-mr-2020-0519 ↗
41. Monitoring process parameters and predicting rail steel welded joint microstructure and mechanical property of three-wire fusion nozzle electroslag welding10.1007/s40194-025-01962-2 ↗
42. Effect of laser shock peening on fatigue properties of U75VG rail flash-butt welding joints10.1016/j.optlastec.2022.107889 ↗
43. Structural transformations of the metal of heat-affected zone of welded joints of high-strength armor steels10.1007/s11003-020-00380-7 ↗
44. Impression creep studies on simulated reheated HAZ of P91 and P91b steels
45. Investigation of the kinetics of decomposition of austenite at continuous cooling of K76F steel for standard rails for broad-gauge railways10.52150/2522-9117-2018-32-317-327 ↗
46. Novikov · 1978 · p 392
47. Tushinsky · 1993 · p 280
48. Advanced heat treatment of pearlitic rail steel10.3390/ma16196430 ↗
49. Standard rails for broad-gauge railways · 2005 · p 31