Fracture Analysis of Trailer Axle

The fracture,composition,microstructure of trailer axles was tested by means of SEM and EDS,the abnormal fracture during assembling and calibrating was analyzed.The experimental results show that there are some internal metallurgy flaws such as looseness,shrink hole in the raw material of the axle,and bad widmanstatten structure from the overheating and over-burning during the heating of forging,the comprehensive effects of these factors cause the steel toughness to reduce,and the internal cleavage exists during forging.Finally,the trailer axle becomes broken when outside force is exerted.