Fracture analysis of the high-speed railway wheel due to changes in microstructure caused by the heat treatment process.
Keywords:
Wheel steel, Fatigue crack propagation, Ferrite, PearliteAbstract
This study investigates the fatigue crack propagation in high-speed railway wheel material, grade ER8, used in the Airport Rail Link in Thailand. Two case studies were conducted to examine the structure of railway wheel steel. First is conventional steel structure or the original structure of high- speed railway wheel, consisting of ferrite and pearlite phases. Second is the structure of high-speed railway wheel materials after heat treatment processes to simulate actual operating conditions. Changes in the microstructure of high- speed railway wheel occur, with an increase in ferrite phase and a decrease in pearlite phase. Mechanical properties were tested using ASTM E8 tensile testing standards and fatigue crack propagation resistance testing was conducted using Universal testing machine with a load of 5 kN at a frequency of 10 Hz following ASTM E647 standards. The results showed that the increase in ferrite phase led to higher elongation but lower tensile strength of the railway wheel material. Additionally, it decreased the ability to resist fatigue crack propagation.
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