Abstract:There is serious die wear in the process of hot forming of aluminum alloy,which not only shortens the service life of the die,but also causes the drawing and forming deviation of the workpiece surface.In order to simulate the friction process between die steel and 7 series aluminum alloy under hot forming conditions,a unidirectional high temperature friction and wear test platform was established to study the friction and wear behavior under hot forming conditions,and the wear surface morphology of die steel and aluminum alloy was analyzed by optical profilometer and scanning electron microscope.The results show that adhesive wear and abrasive wear exist simultaneously in the process of hot forming.The abrasive particles are compacted and accumulated on the rough surface,which has a significant influence on the subsequent friction and wear behavior.The local contact condition on rough contact surface was analyzed by finite element modeling for the contact pair of unidirectional high temperature friction test,and the effect of the local contact condition on the subsequent tribological behavior was discussed.The analysis shows that there is a slip-on phenomenon in the friction process,the local contact pressure is significantly greater than the nominal load due to the influence of surface topography,and the maximum equivalent stress appears under the surface.This research provides an important basis for further analysis of wear behavior and the proposal of appropriate surface engineering scheme.