Abstract
The calculation of the temperature field for the tribosystem of wheel - composition brake shoe of the rolling stock has shown that the maximum temperature in the wheel is not on the surface, but at 200-1000 micron distance from the friction surface. Under friction, as a result of the thermomechanical destruction of the polymer shoe there evolves hydrogen that is absorbed by the contact surface of the wheel. At that, the maximum hydrogen concentration coincides with the maximum temperature. The research results of the segregation phenomena of alloying and impurity elements in the iron grain boundaries are presented. It is shown that the consistency of the rates of the transfer film formation and its destruction is the kinetic condition of self-organization on the antifriction tribo-contact. The atomic-binding energy of different elements to the grain surface is a periodic function of the atomic numbers of the elements. This may serve as a theoretical basis for predicting the strength properties of steel with a different composition of alloying and impurity elements. The obtained results indicate the promising application of XPS and AES of quantum chemistry in solving tribological tasks.
Highlights
Расчет температурного поля для трибосистемы колесо тормозная композиционная колодка подвижного состава показал, что максимальное значение температуры в колесе находится не на поверхности, а на расстоянии 200-1000 мкм от поверхности трения
The calculation of the temperature field for the tribosystem of wheel - composition brake shoe of the rolling stock has shown that the maximum temperature in the wheel is not on the surface, but at 200-1000 micron distance from the friction surface
The maximum hydrogen concentration coincides with the maximum temperature
Summary
Теплофизические, диффузионные и сегрегационные процессы в зоне фрикционного контакта *. As a result of the thermomechanical destruction of the polymer shoe there evolves hydrogen that is absorbed by the contact surface of the wheel. The atomic-binding energy of different elements to the grain surface is a periodic function of the atomic numbers of the elements This may serve as a theoretical basis for predicting the strength properties of steel with a different composition of alloying and impurity elements. В результате проведенных расчетов установлено, что максимум концентрации водорода практически совпадает с максимумом температуры; величина концентрации в точке максимума не зависит от уровня концентрации и от абсолютной величины температуры на правой нерабочей поверхности образца (при Z = l) Этот факт дает основание полагать, что величина энергии связи атомов во многом определяет способность сегрегированных атомов ослаблять или упрочнять границы зерен. По этой же формуле можно рассчитать и энергию разрыва кластера из чистого железа, полагая, что 30-атомный кластер Fe13Fe4Fe13 делится на фрагменты Fe13Fe4 и Fe13
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Вестник Донского государственного технического университета
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
