Studies On The High Temperature Fretting Wear Behavior Of Two Alloys

High temperature friction has received much attention for many years, whereas most of which is on sliding friction and rolling friction. For fretting wear, which is characteristic with small amplitude, few studies have been done on its behavior at high temperatures.With an advanced electric hydraulic high temperature fretting rig, two alloys, 45# steel and 1Crl3 steel, against GCr15 steel have been tested under ball-on-flat contact from room temperature to 400癈 separately. Normal force is ranged from 100N to 300N and displacement amplitude ranged from 15 m to 60 m respectively. Dynamic analyses in combination with the microscopic examinations through Profilometer, Optical Microscope, Scanning Electron Microscope (SEM), Laser Scanning Microscope (LSM) have been performed to study the high temperature fretting wear behavior. The study provides theory foundation and practical guidance for fretting wear prevention at high temperatures.The results show that fretting behavior depends strongly on fretting regime.Friction coefficient and wear reduce as increasing temperature in slip regime, partial slip regime and mixed regime. Friction coefficient reduction in partial slip regime is not so obvious as in slip regime and in mixed regime. At higher temperature, friction coefficient in slip regime almost equals to that in mixed regime.With the increase of temperature, fretting in partial slip regime has the tendency to mixed regime.Compare to room temperature, debris particle in high temperature is much smaller. At high temperature, plastic deformation of 1045 is more serious than that of ICr13 steel. The reason may be that the hardness of 1 Cr13 steel is higher than that of 45# steel at high temperatures.