Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EVALUATION OF THE BEHAVIOR OF WORN OUT RAILWAY COMPONENTS OF THE SHOCK AND TRACTION SYSTEM THAT ARE RECOVERED BY WELDING
Submission Author:
Alice Castro , MG
Co-Authors:
Alice Castro, Daniel Thomaz da Cunha Aragao, Luiz Henrique Dias Alves
Presenter: Alice Castro
doi://10.26678/ABCM.COBEM2019.COB2019-1448
Abstract
The main cast components of the shock and traction system (coupler, yoke and drawbar) on heavy haul wagons (GDT / GDU / HAT) are limited to 12 years of use, even if approved in inspection, due to the higher probability of presenting fatigue cracks. The objective of this research is to evaluate the possibility of extending the useful life of this equipment. The methodology presented in this project is to conduct laboratory tests of fatigue, tensile strength, hardness, and metallographic analysis, comparing four conditions for the components: new, used, recovered by means of welding, and recovered by welding with heat treatment. The results showed that the new and used parts presented good results and those recovered by welding without heat treatment showed a very fragile microstructure called Widmanstätten Ferrite. Finally, the samples that were recovered and treated showed high hardness values, whereas the values measured for elongation and reduction in area in the tensile tests were low. Therefore, it was concluded that the tempering temperature was low and the temperature of 560ºC was the most adequate to achieve the purpose of increasing the useful life of these components.
Keywords
Heavy haul, Shock and Traction System, welding
