Braking discs play an important role for the safety of vehicles whereas severe frictional contacts in repeated braking operations result in thermal and tribological failures.This paper reports comprehensive surface an...Braking discs play an important role for the safety of vehicles whereas severe frictional contacts in repeated braking operations result in thermal and tribological failures.This paper reports comprehensive surface and subsurface analyses of a used grey cast iron braking disc to investigate its failure mechanisms as well as related microstructure evolution.Thermal cracking,spalling wear and tribo-oxidation have been found to contribute to the wear failure.The flake-type graphite of the grey cast iron triggered propagation and internal oxidation of the metallic matrix.In a depth of 3 mm beneath the rubbing surface,extensive microstructure evolution occurred by severe plastic deformation of the ferritic matrix,nodularisation and partial dissolution of the lamellar carbides,and internal oxidation.The microstructure evolution resulted in decreased surface hardness to HV0.3247 as compared to HV0.3284 of the bulk cast iron.展开更多
基金partially funded by in the European Regional Development Fund of European Union in the title‘Sheffield Innovation Programme’with the series number 28R18P02582.
文摘Braking discs play an important role for the safety of vehicles whereas severe frictional contacts in repeated braking operations result in thermal and tribological failures.This paper reports comprehensive surface and subsurface analyses of a used grey cast iron braking disc to investigate its failure mechanisms as well as related microstructure evolution.Thermal cracking,spalling wear and tribo-oxidation have been found to contribute to the wear failure.The flake-type graphite of the grey cast iron triggered propagation and internal oxidation of the metallic matrix.In a depth of 3 mm beneath the rubbing surface,extensive microstructure evolution occurred by severe plastic deformation of the ferritic matrix,nodularisation and partial dissolution of the lamellar carbides,and internal oxidation.The microstructure evolution resulted in decreased surface hardness to HV0.3247 as compared to HV0.3284 of the bulk cast iron.
