Rolling Contact Fatigue and Wear Behavior of High-Performance Railway Wheel Steels Under Various Rolling-Sliding Contact Conditions
| Autor: | Candida Petrogalli, Matteo Lancini, Michela Faccoli, Angelo Mazzu, Andrea Ghidini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
damage analysis
Materials science strain hardening Mechanical Engineering Metallurgy Railway wheel steel damage analysis wear rate strain hardening crack analysis Railway wheel steel Rolling contact fatigue 02 engineering and technology crack analysis Deformation (meteorology) Strain hardening exponent 021001 nanoscience & nanotechnology wear rate Dry contact 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Lubrication General Materials Science Rolling sliding Composite material 0210 nano-technology Contact pressure Rolling speed |
| Popis: | An experimental investigation was carried out to study and compare the response to cyclic loading of the high-performance railway wheel steels ER8 EN13262 and SUPERLOS®. Rolling contact tests were performed with the same contact pressure, rolling speed and sliding/rolling ratio, varying the lubrication regime to simulate different climatic conditions. The samples, machined out of wheel rims at two depths within the reprofiling layer, were coupled with UIC 900A rail steel samples. The wear rates, friction coefficients and hardness were correlated with the deformation beneath the contact surface. The crack morphology was studied, and the damage mechanisms were identified. The distribution of crack length and depth at the end of the dry tests was analyzed to quantify the damage. The main difference between the steels lies in the response of the external samples to dry contact: SUPERLOS® is subjected to a higher wear and lower friction coefficient than ER8, and this reduces the density of surface cracks that can propagate under wet contact conditions. The analysis of feedback data from in-service wheels confirmed the experimental results. |
| Databáze: | OpenAIRE |
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