Microstructural study of rabble abrasion behaviors in high-speed train lines

Microstructural Study Of Rabble Abrasion Behaviors In High-Speed Train Lines The aim of this study is to examine the microstructures of the high-speed railway lines using advanced metallographic research (such as X-rays, sem and optical microscopy and point analysis) techniques for the atomic interior construction and surface roughness of the S49 series rail steel before and after the rails are eroded. It is also aimed to make coMParison with other materials, to determine the measures to increase the strength of the worn rail steel and to make the S series rail steels used more stable and more durable than wear and to be more productive in production. For this purpose, specimens were prepared by subjecting the rail sample made of S49 steel to cutting process. For the abrasion test, 9 samples A1-A2-A3, B1-B2-B3 and C1-C2-C3 were formed. The samples taken from the S49 steel were heated to 8000C in the heater furnace and subjected to austenitization for 15 minutes. After this process, sample temperatures were kept at 5500C, 5750C and 6000C for 5 minutes and heat treatment was applied by cooling in air. Then the sample was polished with mercury and velvety using 80μ, 220μ 400μ, 600μ, 800μ and 1000μ felts. After polishing, the sample cleaned with alcohol is polished with velvet until it is seen on the microscope, and after the image is obtained, it is etched with 2% qualitative. The JET WMH Tool, which is located at the laboratory of Fırat University Metallurgical and Materials Engineering at specimens A1, B1 and C1 at loads of 10N, 20N and 30N and at 1800m, 3600m and 5400m, Group AG were subjected to a wear test with the GH-8603 abrasion device. The specimens obtained from the experimental stages were examined by light microscopy, SEM, XRD and EDS images. As a result of the research, it was determined that the S49 rail steels suffered mass loss in direct proportion to the load, shear rate and slip distance variables, that is, the level of wear increased. Key Words: Wear, S49 Rail Steel, SEM, EDS, Metallurgy